The Project Gutenberg eBook of Scientific American Supplement, No. 664, September 22,1888
    
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Title: Scientific American Supplement, No. 664, September 22,1888

Author: Various

Release date: January 15, 2008 [eBook #24322]

Language: English

Credits: Produced by Juliet Sutherland, Huub Bakker, and the Online
        Distributed Proofreading Team at www.pgdp.net


*** START OF THE PROJECT GUTENBERG EBOOK SCIENTIFIC AMERICAN SUPPLEMENT, NO. 664, SEPTEMBER 22,1888 ***




Produced by Juliet Sutherland, Huub Bakker, and the Online
Distributed Proofreading Team at www.pgdp.net





[Illustration]




SCIENTIFIC AMERICAN SUPPLEMENT NO. 664




NEW YORK, SEPTEMBER 22, 1888

Scientific American Supplement. Vol. XXVI., No. 664.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.

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TABLE OF CONTENTS.


                                                                  PAGE
I.    ARCHITECTURE.--The Commercial Exchange, Paris.--History
      of the new building, with its general design and
      architectural features.--2 illustrations                   10607

      The New Central Railway Station at
      Frankfort-on-the-Main.--A full description of this
      gigantic structure, with its constructive features and
      cost.--2 illustrations                                     10605

II.   ART OF WAR.--Gun Practice in the French Navy.--Gun
      practice at sea against a moving target.--1 illustration   10599

      Modern Cavalry on the Field of Battle.--By Col. R. S.
      LIDDELL.--An exhaustive paper on this subject, treating
      of a much discussed branch of military tactics             10600

III.  BIOLOGY.--Subterraneous Flora and Fauna.--By Dr. Otto
      Zacharias.--A popular article on the interesting subject
      of animal and vegetable life underground.--8
      illustrations                                              10612

IV.   CHEMISTRY.--Pepsin.--By A. PERCY SMITH, F.I.C.,
      F.C.S.--The analysis of pepsin, difficulties of the usual
      method, and simple comparative test, applicable by any
      one                                                        10611

V.    CIVIL ENGINEERING.--Timber and Some of Its Diseases.--By
      H. MARSHALL WARD.--Continuation of this valuable series,
      treating of fungus life and its destructive effects.--5
      illustrations                                              10613

VI.   ELECTRICITY.--A Basis from which to Calculate Charges for
      Electric Motor Service.--A practical paper treating of
      the percentage of horse power hours used in different
      industries                                                 10608

VII.  ETHNOLOGY.--A Chinese Imperial Cemetery.--The cemetery of
      the emperors of the Ming dynasty.--The remarkable statues
      and buildings.--2 illustrations                            10610

      How a Mound was Built.--An interesting contribution to
      the history of the Ohio mounds by Mr. GERARD FOWKE         10609

      Some Abyssinian Customs.--The hair dressing of the
      Abyssinian women.--Their method of grinding pepper.--3
      illustrations                                              10609

VIII. MEDICINE AND SURGERY.--A New Surgical Operation.--Dr.
      Brudenell Carter's operation for relieving pressure on
      the optic nerve                                            10611

      Dyspepsia, its causes and prevention.--How this malady is
      caused and how easily it may be guarded against, an essay
      in prophylaxis                                             10610

IX.   MECHANICAL ENGINEERING.--Coal Tar as Fuel for Steam
      Boilers.--By JOHN McCRAE, of Dundee.--A review of the
      economy of tar firing and of the method employed by the
      writer.--1 illustration                                    10604

      Steam Generator of Serpollet Brothers, producing steam
      instantaneously.--A new inexplodible steam generator, its
      construction and application to a tricycle.--3
      illustrations                                              10602

      Transmission of Power between Bodies Moving at Different
      Velocities.--A simple system of transmitting power
      applicable in many places                                  10602

X.    MISCELLANEOUS.--Note on Missouri Marble                    10614

      Water Blast Pump.--A filter pump of simplified and
      improved construction.--3 illustrations                    10602

XI.   NAVAL ENGINEERING.--Iron Sailing Ships.--Scotch sailing
      ships, built of iron and steel, the favorite sizes and
      rigging adopted.--1 illustration                           10602

XII.  SANITARY ENGINEERING.--Putzeys' Flushing Reservoir.--A
      French invention, applicable in sewage disposal and pipe
      flushing.--1 illustration                                  10611

XIII. TECHNOLOGY.--Gas Lighting by High Power Burners.--A
      review of a number of regenerative and other gas burners
      and their practical success                                10603

      Synchronizing Clocks.--A simple synchronizing mechanism
      described and illustrated.--1 illustration                 10604

      Watch Cleaning and Repairing.--A long paper treating of
      the details of watch cleaning from the practical
      standpoint                                                 10604

       *       *       *       *       *




[Illustration: GUN PRACTICE IN THE FRENCH NAVY.]

GUN PRACTICE IN THE FRENCH NAVY.


The gunners of the French fleet are possessed of a skill which is
recognized by all the maritime powers, and these picked men proved
this at the siege of Paris, where they made themselves illustrious,
not only by their courage and their coolness, but also by the accuracy
of their firing.

Nothing is neglected, moreover, to keep up the precision of hand and
eye that distinguishes them, and which has become so much the more
necessary in that it is no longer a question of firing a broadside at
the enemy and reckoning on one ball being more fortunate than another
in damaging the enemy's ship. At present, the most powerful ironclad
has four, and sometimes six or eight, guns of large caliber, which are
of from 30 to 100 tons. Every shot represents not only an enormous
sum, but also a prodigious force expended, and so powder must not be
used too lavishly, since the shot should be in relation with the
colossal power that it represents, and the shell adopted in the navy
is accompanied with so disastrous effects that a single one, well
directed, is capable of reducing the enemy's ship to impotence. So
exercises in firing are becoming more and more frequent, and they have
a right to be multiplied, inasmuch as the present guns are complicated
affairs, the maneuvering of which requires constant practice.

Our engraving represents one of these exercises performed by the
Squadron of the North, which is of recent organization, and which
consists of the three ironclads Marengo, Suffren, and Ocean, and three
coast guards Furieux, Fulminant, and Tonnerre. Each of the ironclads
is provided with four 27 cm. guns and four 24 cm. ones, not counting
the revolving guns, which constitute the small artillery reserved for
fighting torpedo boats. The Furieux has two 34 cm. guns, and the
Tonnerre and Fulminant each two 37 cm. ones.

An endeavor is made, as far as possible, to practice firing such as is
done in a naval action, that is, at moving targets. To this effect,
the dispatch boat Epervier tows a rectangular float about two meters
in length, upon which are arranged two canvas balloons kept taut by a
wooden framework. One of these balloons is white and the other is
black. Each is a meter in diameter, and is supported by a rod which is
usually a meter in height. The vessels of the squadron successively
fire their large guns at this target, which moves at a definite
velocity. The shell, on dropping into the water, raises an immense
jet, which entirely hides the balloons when the projectile falls in a
line with and sufficiently near the target.

The smoke that envelops the ships, the thunder that echoes in the calm
of the sea, and the jet that rises in the air produce a thrilling
effect and give an idea of the power of man carried to the last
expression.--_L'Illustration._

       *       *       *       *       *




MODERN CAVALRY ON THE FIELD OF BATTLE.[1]

   [Footnote 1: A lecture lately delivered at the Aldershot Military
   Society's library.]

By Col. R. S. LIDDELL.


I feel that some apology is due from me for coming down to Aldershot
and giving my opinions before so many officers whose daily experience
renders them much more capable than I am of bringing this subject
forward, and it was with some hesitation that I yielded to the
flattering invitation of the Military Society of Aldershot to read a
paper here to-day on cavalry. At the same time, if it is thought that
anything I can say can increase the success that this society has
already met with, I can only add that I render my services most
willingly. It seems to me one of the many advantages that these
meetings possess is the bringing together of the different branches of
the service, and the mutual information they afford of each other's
arm. When we look back only a few years, we have much to be thankful
for in the disappearance of a vast amount of prejudice that used to
exist between the different branches. Each arm thought that theirs,
and theirs only, was worth studying. Infantry officers sometimes said,
as long as their arm was sufficiently numerous and well equipped,
that, with the exception of a few scouts and orderlies, cavalry might
be dispensed with. Artillery might think that unless guns were largely
used, no infantry could ever make an attack at all; while cavalry
officers, who were perhaps the most conservative of all, would point
to the past, and show how every battle that had ever been fought was
won by cavalry, and ever would be.

Confidence in one's own arm is most desirable, and should be fostered,
if at the same time we can learn how to work with others, remembering
that while cavalry gives the information to and hides the movements of
the army, while artillery shakes and disperses the enemy's formation,
and prepares the way for attack, it is the infantry alone who can
assault and hold the position, and it is for their advance and to
bring them up to the point that determines the battle in the condition
most favorable to insure success that all the efforts of the other two
arms must be devoted. I have made these preliminary remarks, as from
my paper being entirely given to the actions of cavalry, it might
appear that I am claiming more for that arm in the battle field than
is reasonable; but I wish it clearly understood that whatever I may
say is only in an auxiliary sense to the action of infantry, and I
trust that I shall not be thought underestimating other arms, while
showing unbounded confidence in my own.

The necessary rest required by Europe after the exhaustion of the wars
of Napoleon resulted in the long peace which succeeded the campaign of
1815. This, and the improvement that took place in fire arms in the
next forty years, gave room for speculation as to whether cavalry
would play as important a part in the future as it had done in the
past, under Marlborough, Frederick the Great, Napoleon, and
Wellington. The Crimean war helped to confirm the opinion that the
days of cavalry had gone by. No account was made of the enormous
distance by sea that the cavalry had to be transported, the
unfavorable nature of the seat of war for that arm, the little scope
given in a campaign that resolved itself into a siege, the smallness
of the cavalry force employed, and the difficulty in keeping up a
fresh supply of horses. After this war came the introduction and
improvement in the breech loader, and with it opinions were
strengthened that cavalry duties would be still further limited, and
its traditions for a time appear to have been lost.

The awakening from this transient period of theory came from a nation
not trained to arms, and it is to the American civil war that we owe
the revival that took place in the use of the cavalry arm. The raids
made by the Confederates under Morgan, Stuart, Forrest, and by the
Federals under Sheridan, drew attention to advanced cavalry work, such
as scouting, reconnaissance, outpost and dismounted work. As
particular examples we may select Morgan's boldest and greatest raid
in 1862, when he passed through Kentucky and Indiana, capturing large
stores from the enemy. By his rapid and skillful marches the Federal
officers were completely bewildered. He was absent from his army 24
days, in which time he traveled 1,000 miles, capturing 17 towns and
destroying all the government supplies and arms. In a second raid he
forced the Federal army to fall back by taking possession of the
railway in its rear which brought it supplies. In October, 1862,
Stuart made his greatest raid through Pennsylvania, around the
Northern army. He set out with 1,800 cavalry and four pieces of horse
artillery, and crossed the Potomac. The telegraph wires were cut in
all directions, railways obstructed, and a large number of horses
captured, and all the public stores and buildings were destroyed. His
position at this time was very critical, 90 miles from his own army.
He considered it less dangerous to return by the opposite way to which
he came.

Forrest used his cavalry in every possible manner, dismounting in the
battle field and employing it as infantry. In October, 1864, during a
raid, he impeded the navigation of the Tennessee River, which was
filled with Federal gunboats. Choosing a strong position on the bank,
he masked his guns and awaited the approach of the enemy's vessels. He
captured a gunboat and a transport, and manned them with his own men;
but his naval expedition did not last long. Pursued by several
gunboats, he had to run his ships on shore, when the troopers gladly
mounted their horses again. His object was, however, gained--inspiring
alarm throughout the country and occupying a considerable number of
the enemy. Later on the Federals copied this system, when the raids of
Sheridan, with his 10,000 horsemen, armed with the magazine rifle and
revolver, with sword attached to the saddle, brought about the final
overthrow of the Southern army.

The next campaign that took place was in 1866, known as the "Seven
Weeks' War," when large bodies of cavalry were used by the Austrians
and Prussians. This campaign was of such short duration that there was
not sufficient time for the experience gained in the use of cavalry to
be utilized while the war lasted; but when the war was over, both
sides, having bought their experience, set out to reorganize their
systems, and the course pursued by the Prussians after this campaign
in largely increasing their cavalry was fully justified by the
advantages reaped in the war in France in 1870. At the close of the
Franco-German war the attention of the whole of Europe was called to
the successful use of German cavalry during the campaign, more
especially the advanced duties, when at times 60 miles in breadth and
50 in advance of the army was covered by the cavalry.

In England, after the termination of this war, many German military
works of great value were translated and published; the battle fields
in France were visited and described; every movement of both armies,
strategical and tactical, was studied. All this tended to draw our
attention to the extended use of the cavalry arm in future campaigns,
and the shortcomings of our own system were carefully scrutinized. The
movements of our drill book were simplified, the careful training of
our men in shooting was more fully recognized, and the teaching of
advanced cavalry duties, reconnaissance, outpost and dismounted work,
were gone into most thoroughly--in such a manner that I may
confidently appeal to those officers who have the best opportunities
of forming an opinion, whether our cavalry does not bear comparison
now with what is being done in other armies, and in these matters is
advancing in a satisfactory manner. While all this good work has been
going on (and I would be the last to say one word that might seem to
depreciate its value) we may perhaps have permitted the action of
cavalry on the field of battle to escape from sufficient notice.

It is for this reason I will ask your permission to bring before you
this subject, believing that the opinions of all branches of the
service being brought to bear upon it, considerable advantage maybe
obtained. It will be my endeavor to show, not by my own arguments, but
by quotations from others, that cavalry still has an important part to
take on the battle field, and far from its duties ending when armies
come in contact, that it is still reserved to them, as has been the
case before, to decide, perhaps by only one charge, the issue of a
whole campaign. Prince Kraft in his letters on cavalry says: "The
battle of Mars-la-Tour, won by the bold employment of cavalry, made
possible the blockade of Metz, and afterward the surrender of the
whole of Bazaine's army. So it may be said, without exaggeration, that
the charge of Bredow's six squadrons on that day was the turning point
of the Franco-German campaign."

Colonel Home, in his "Précis of Modern Tactics," says: "The action of
cavalry on the actual battle field is by no means a thing of the past.
The use of cavalry with skill at the right moment and in the right
numbers has always been considered one of the most difficult problems
in war. Modern arms have increased this difficulty manifold, but to
say the day of cavalry on the field of battle is past is merely
another way of saying that the knowledge of how it should be used is
wanting." Cavalry is apportioned to an army in two capacities: (1)
Divisional cavalry, that is (if possible) a regiment, or as many
squadrons as can be spared, attached to each infantry division, acting
under the orders of the general of the division. (2) The cavalry
division, that is, a large body of cavalry composed of several
brigades, an independent body having its own commander. On the march
the divisional cavalry covers the head and flanks of its own division:
on the field of battle it will be as near as possible to its division,
in the most sheltered spot that can be found; in the early part of the
battle it would be kept as much in reserve as possible, écheloned in
rear of one flank of its own infantry. It would remain there until the
artillery and musketry had effected their work, and the enemy's flanks
had become thinned and shaken. Then, when his infantry become tired
and exhausted, under cover of the smoke, the cavalry may be further
advanced.

Prince Kraft says: "At Sedan the divisional cavalry were employed
during the battle, charging by single squadrons, patrolling and
reconnoitering to obtain information of the enemy and the ground.
Every infantry body is accompanied by patrols, however small." An
instance of the too early employment of cavalry in a battle occurred
at Waterloo, when Napoleon at the commencement launched his cavalry
into the fight. The result was that although it far outnumbered the
English at first, it became so reduced, depressed, and worn out, that
it was unable afterward to offer full resistance to the British
squadrons, who were comparatively fresh. Wellington, on the contrary,
after his first successes, kept his cavalry, as much as possible, in
reserve. The field of battle itself shows the proper situation of
cavalry, but the divisional cavalry on the defensive side must always
be at hand to fall upon the flanks of the enemy's infantry when in
extended order, while that of the attacking side must be equally at
hand to prevent the flanks of its own infantry being so attacked.

In discussing the action of divisional cavalry, the most advantageous
time for its assisting in the combat must be considered. At what
moment, if any, can infantry be attacked by cavalry? When opposed to a
force acting on the defensive, divisional cavalry has its operations
limited, and probably in the earlier part of an engagement, confined
to watching, and, if possible, guarding the flanks of its own
attacking infantry from surprise. It is the cavalry on the defenders'
side that has the greatest opportunities. In both cases, however, a
rule must be made not to attack infantry when it has taken up a
favorable position, or before its ranks have been shaken by artillery
or musketry. Prince Kraft, in speaking of Mars-la-Tour, says: "This
same day took place a series of cavalry charges of greater or less
importance, which all showed practically to the cavalry the limits of
their effective action against infantry. The advancing infantry were
brought to a stand, infantry who gave way were ridden down, but where
the cavalry attacked infantry intact, the cavalry were unable to
prevail."

The precision of modern fire arms has necessitated great changes in
infantry tactics. To advance against the murderous fire of the present
rifle, infantry is compelled to adopt scattered formations in small
lines, and to move forward with sudden rushes. All this lends itself
to the attacks of an active cavalry. When these infantry attacks take
place, it may be presumed that they have already been under arms some
hours, have marched some distance, and been exposed to considerable
loss from artillery and musketry fire. Their advance in extended
formation will have commenced at about 1,000 yards, or earlier. By
this time the squadrons opposing them will have been brought to a more
advanced position, to the nearest point to their flank where cover is
afforded, and to carry this out successfully requires skillful
handling. Files must be extended, and short rushes made with small
bodies, say half a troop if over exposed ground, into sheltered
places. It is true that cavalry cannot hide themselves over exposed
ground as infantry can, but they have one advantage that nothing can
deprive them of--rapidity of motion; and the distance that would take
them say 10 seconds to traverse, viz., 150 yards, would take infantry
a minute.

Prince Kraft writes: "No battle field is a _tabula rasa_, for in the
most exposed country there are depressions. If strong skirmishing
lines of infantry can advance directly over a country devoid of cover,
cavalry can undoubtedly do the like, if by making use of the lie of
the ground they can gain the enemy's flank. A skilled cavalry leader
will thus undoubtedly find an opportunity to get close to the enemy."
Having arrived at this more advanced position, say from 500 to 1,000
yards, according to the formation of the ground, the nearer the
better, the most favorable moment to assail the flanks of the
attacking infantry would probably be immediately before the last belt
of the fighting line, and before the main body had re-enforced them,
as they are preparing for their last united rush, and as their
supports are doubling up to join them.

At this moment the men would be to some extent out of breath, their
attention would be fixed on the point about to be attacked, and their
flanks would be neglected. Cavalry should then descend upon them at
the utmost speed that can be extracted from the horses, with a good
interval from knee to knee. If there is only one squadron, one troop
should take the flank or fighting line, while the other throws itself
upon the support. As the distance to be covered in the open will
probably be not more than from 200 to 400 yards, they will be exposed
to fire, supposing none of the ground is undulating, for fifteen to
thirty seconds when at full speed. As they close on the infantry
neither the supports nor those in rear of them or their artillery will
dare to fire, on account of their own men. If the infantry run to get
into small squares, as is most likely, the cavalry must endeavor to
catch them before they assemble. If they get together it may be too
late for the cavalry to stop. They must then throw themselves upon
them and trust to the supporting squadron to complete the attack.

Although it is rare that a battle field is on such ground that there
are no undulations to afford shelter for cavalry in an advanced
position, this may be the case, and if so the enemy's infantry attack
must be allowed to take place, but even then, by cavalry showing
itself on the flanks for a moment, infantry would get together and
afford a better mark for fire, and the progress of the attack would be
delayed. The very appearance of cavalry frequently frightens infantry
into masses. If the ground was too much exposed for the charge, men
might be dismounted, with their carbines, at a safe distance to assist
the infantry. If mounted infantry were at hand, they would be utilized
in the same way, and the machine guns of the cavalry would also pour
in their volleys. If the enemy's attack is successful, cavalry must
then advance on their flanks and take its chance, and if necessary
sacrifice itself to give its own infantry time to rally. If it is
unsuccessful, the cavalry must be ready to take every favorable
opportunity of molesting its broken ranks.

Speaking of Mars-la-Tour, Prince Kraft says: "During the battle a
German infantry brigade was forced to retire with heavy loss, and ran
some danger of being annihilated by the pursuing enemy. But the First
Dragoons of the Guards threw themselves on the pursuers. The enemy's
infantry massed round the eagles and ceased to press on, while the
thin ranks of our infantry were able to rally, and our guns were saved
and brought into position. The losses were heavy; half a regiment of
cavalry (250 horses) were sacrificed in order to save the brigade." At
Waterloo a French division of infantry fled before three regiments of
dragoons (the Union Brigade). The Royal Dragoons and the Inniskillings
in first line, the Scots Greys on their left rear, the whole under Sir
William Ponsonby, acting in support of the Highland Infantry Brigade,
were awaiting the attack of the whole of the 1st French Division under
Gen. Alix. The three Scotch regiments threw into them a concentrated
fire, and as they were staggered by the shock Ponsonby gave the order
to advance. Passing through the Highlanders, the Greys having come up
into line, the three regiments charged the leading portion of the
French column, which yielded, and those in rear were hurled back. The
dragoons having the advantage of the descent of the hill appeared to
mow down the mass, the Greys on the left pressed on through the
supporting brigade of the French, while the Royals drove back the
right, giving no time for fire. Many threw down their arms, while
hundreds of prisoners were hurried off to the rear of the line. At the
same time the Inniskillings forced their way through the center, when
the remainder of the French division broke and fled.

It may be said that this took place before the introduction of the
rifle, and is therefore no example, but it took place within the range
of the weapon then in use, and at that distance it was equally
effective. The celebrated charge of Bredow's brigade at Vieuville
(Mars-la-Tour) also shows what an energetic attack may do. It had
become necessary to demand a sacrifice from the cavalry for the good
of the army, to enable Prince Frederick Charles, with only 24,000
infantry, to hold in check Bazaine's army of 180,000 until his own
main body came up. Bredow's cavalry brigade consisted of six squadrons
of the 7th Cuirassiers and the 16th Uhlans. They were ordered to make
a breach in the front of the 16th French Army Corps.

The six squadrons advanced in column, the cuirassiers leading, when
they received the word to change direction to the right, then to form
line, which was done under heavy fire. The cuirassiers getting into
line first, charged at once, the 16th following in echelon. In a
moment the batteries, vomiting flames, were reached with a loud
hurrah, and the gunners cut down at their guns, when the whole
brigade, which had now got into one line, charged the long lines of
infantry in rear, who received them with a heavy fire from their
chassepots. These lines, too, were broken through, and the main object
of the charge was attained, but, carried away by the ardor of the
combat, they charged and took the mitrailleuses, when the French
cuirassiers, with a dragoon brigade in support, come down upon them,
and compelled them to fall back. This they did, having to force their
way back through the enemy's masses of infantry with enormous loss.
The object, however, was gained, and the attack of the French corps
checked and never resumed. The cavalry division covers the advance of
the whole army, and is a day or two in front of it. It conceals and
guards the army, while finding out the movements of the enemy. It
collects information, and is also used with horse artillery on great
enterprises on the enemy's communications. Having finished the
reconnaissance and covering the army on the day of battle, it falls
back as the two opposing sides come in contact, and awaits further
orders. On the battle field it should be placed so as to suffer as
little loss as possible--as a rule, in rear of the flanks. How far
must depend on the formation of the ground; if shelter is to be
obtained nearer the front, the better. If not, then some 2,000 yards
in rear of one flank would seem advisable. Its duties are to guard the
exposed flank or flanks and rear of the army, while it watches the
cavalry of the enemy. If within range of artillery, it should be kept
on the move from front to rear. Its strength should not be wasted or
frittered away on doubtful enterprises, as it maybe required for some
decisive blow, in pursuit, or in covering the retreat.

Prince Kraft, speaking of the battle of St. Privat, says: "On the 18th
of August the gigantic fight of St. Privat took place. The cavalry
divisions were held back in reserve, but the divisional cavalry took
an active part. During the battle a squadron of hussars advanced and
sent information of the enemy making a flank movement." He also says:
"At Sedan the cavalry division was kept in reserve." The massing of
artillery at the commencement of a battle must expose a long line with
some weak spot to attack. If protected by cavalry, then probably a
cavalry combat will ensue. Prince Kraft says: "The action of the
masses of German cavalry at Mars-la-Tour excited wonder and
admiration; they surprised the enemy's cavalry when in bivouac, they
met and surrounded the hostile infantry in a threatening manner, and
thus 8,000 cavalry occupied 65,000 infantry, until the Prussian
infantry came up. The cavalry made no charges which could not have
been successful, but carried out their task of occupying the enemy
almost without loss.

"In the old days these squadrons would have charged and ridden down
the infantry. The change is the result of the improvement in fire
arms." During the early stages of a battle, advanced parties, under
officers selected for the purpose, must be kept out from the cavalry
division to watch the enemy's movements, and the information they
should be able to afford should be invaluable to the general-in-chief.
An engagement with the enemy's cavalry should not be sought unless
they are much weaker; but should the necessity arise, the ground
should be reconnoitered, and every advantage of position taken to
insure success. The attack being determined on, the preparations for
it should be carried out rapidly. Echelon movements have many
advantages. They favor the formation of oblique lines, they also
insure in a charge direct to the front the bringing up of squadron
after squadron in support. The attack of Vivian's Hussar Brigade upon
the French reserves at Waterloo gives a brilliant illustration of
this, and has been termed by Siborne the "crisis of Waterloo." This
celebrated charge, intended to be in line, became virtually a charge
in echelon of squadrons in consequence of the rapid pace of the head
of the column.

"The movement of cavalry must be rapid and unexpected, and bear the
character of determined confidence; an effort should be made by
maneuvering to come suddenly on the enemy's flank. A gentle declivity
for the final charge must be sought. The rapid, vigorous, and
determined charge in line on to cavalry, riding knee to knee, is what
is required." The charge to be made effectual, the horses must be
brought up in wind, the gallop must not be begun too early; when begun
it must gradually be increased to a fast gallop, the final charge for
the last sixty yards made with every horse extended. "Nothing, then,
must be left undone to excite the spirit of enthusiasm, even to
ferocity; then, and only then, the 'cheer' to be raised." At Waterloo
the charge of the heavy brigade, the 1st and 2d Life Guards and King's
Dragoon Guards, with the Blues in support, is a good example of a
successful attack on cavalry. The French line of cavalry as it
advanced presented an imposing appearance.

They had ascended the brow of the ridge, when a vigorous fire from
Ross' Horse Artillery was opened on to them. In the next moment their
trumpets sounded the charge and they rushed to the attack, and as
cuirassiers approached the British squares, the Heavy Brigade dashed
into them. The shock was terrific. The right of the Life Guards being
thrown forward, came first into collision. The right of the French was
suddenly thrown out by coming unexpectedly on to a hollow way, and as
they passed it the 2d Life Guards came full speed upon them. The
French cuirassiers were driven back and pursued until the English
brigade came under infantry fire.

The charge of the Heavy Cavalry Brigade at Balaklava, under Gen.
Scarlett, is another good example, when the Russian cavalry, receiving
the British charge at a halt, were entirely overthrown. One of the
greatest difficulties after the charge is to know when and how to
stop, and it is then that the squadron and troop leaders, well in
front of their men, must use all their efforts to carry out the ends
of their commander. I think this is the time when a strong whistle
carried by the commanding officer and the squadron leaders can be used
with good effect. Being an unusual sound, it would attract attention.
The battle being over, some of the most serious duties of cavalry
commence. If the enemy is victorious, the pursuit has immediately to
follow. History points out the difficulty of carrying this out.
Uncertainty of the victory, or how far it can be counted on, often
delays its commencement. Battles are often ended by nightfall,
valuable time is lost, and the golden opportunities are past. An
active cavalry leader will, however, without further orders at least,
follow with his advanced parties and not lose touch of the enemy. He
will soon learn the condition of the enemy, act accordingly, harass
his flanks and rear and play upon him with his artillery.

An example of another manner in which cavalry may be employed after a
victory can be taken from the Egyptian campaign of 1882, when, after
the battle of Tel-el-Kebir, by a rapid advance of the cavalry some
fifty miles ahead of the infantry, the capital of the country was
captured by the English cavalry division.

If the battle is lost, still greater are the responsibilities of the
cavalry. Detached squadrons with scouts must be sent round the flanks
to ascertain the strength of the enemy sent in pursuit. Every
available position must be taken up by the horse artillery, and every
advantage seized for counter attack. Above all, accurate information
must be obtained for the general-in-chief of the nature of the
pursuit, in order that he may not harass his main body by falling back
further than necessary. This subject, however, is beyond the scope of
this lecture, and is one of study of past campaigns.

Of the action of cavalry in savage warfare, the recent campaigns in
Africa have given some experience. In the presence of an enemy met
with in such enormous numbers as in the desert, cut off from all help,
knowing that unless you win you die, it seems to be decided that our
infantry must adopt the square as the most suitable formation. In the
Zulu war, the cavalry at the battle of Ulundi was placed inside the
square. The experience met with there was exceptional, and from the
swarms of savages surrounding the square in all directions it was
considered desirable to keep the 17th Lancers in the center of it, in
order that they should not interfere with the infantry fire, and that
when the enemy was repulsed, they should be launched out upon them,
and this was done with perfect success. It is, however, contrary to
the instincts and traditions of cavalry to be shut up in a square,
and, where practicable, I should think cavalry outside a square, even
at some distance out of the way of the infantry fire, acting with
horse artillery, would very much disturb the attacking bodies of the
enemy, and perhaps attract away a portion of them, and they could be
brought up, when called upon to do so, to carry out the pursuit.

In the first campaign on the east coast of the Soudan, on the advance
to El Teb and afterward to Tokar, squadrons were sent in front and on
the flanks of the square with scouts thrown out to feel the way and
obtain information, while the main body of the cavalry was echeloned
on the rear and flank opposite an angle of the square in the most
suitable manner to avoid any interference with its fire. During the
action it remained in this position until after the first attack on
the square, when it moved away past the square on the outward flank
and acted on the enemy's rear and engaged their reserves until the
action was over. During the desert march in the Nile expedition, the
19th Hussars, by its scouting, protected the square and gave it timely
notice of the approach of the enemy.

In a country where a great deal of bush abounds the effective charge
of cavalry on to groups of savages is very much curtailed. The Arabs
throw themselves on to the ground behind the prickly bushes, the ranks
are opened out as the horses avoid the thorns, and the men get no
chance of using their swords; but although much execution is not
achieved under these circumstances, the natives have great fear of
cavalry, and they are prevented from attacking elsewhere. When their
attention is thus occupied, horse artillery and machine guns might
make great havoc among them. At the action of Tamai, where the ground,
from the rocks and ravines of the neighboring mountains, was
unsuitable for cavalry charges, when one of the infantry squares was
broken, the cavalry advanced, and one squadron of the 10th Hussars,
dismounting, helped to create a favorable diversion by pouring fire
into the flanks of the attacking Arabs.

My remarks would, I think, be considered incomplete if I did not touch
on the question of cavalry charging squares, as this point is always
made very prominent in all discussions on the action of cavalry. I
therefore must not pass it by. I will say at once that I think it most
undesirable, even under favorable circumstances, that cavalry should
charge a formed square and men armed with the breech loader. At best
the gain can be but local and partial, while the loss to the
cavalry--an arm so difficult to keep up in numbers--must be
disastrous, and it seems to me that if cavalry by its appearance can
force infantry to form square, it has done enough, and that the
artillery, infantry, and machine guns should do the rest. The
necessity might, however, arise, and by looking at the past we see its
possibility. At Langensalza two Prussian squares were broken by the
Hanoverian cavalry, and the major part taken prisoners.

We have only to turn to the recent campaigns in Egypt to see the
effect of determined rushes of men, intending to succeed, charging on
to squares carefully formed on ground affording shelter, with an
enormous amount of fire being poured upon them. It will be said that
these men were fanatics, but our cavalry, too, have been, and will be,
fanatics in a charge; and I still think, if the necessity recurs, that
an attack, properly conducted on favorable ground, one troop charging
on the corner of a square, followed by another at double distance,
others in echelon on both flanks immediately following, the whole
charging with the greatest impetuosity, intended to win, will break
down any square that Englishmen are likely to meet with. If we look
back again on the past, we will find many instances of British cavalry
not being called upon in vain to make a sacrifice. At Talavera, the
23d Light Dragoons, supported by the 1st Hussars of the German Legion,
advanced against the French squares. In their impetuous rush they came
upon a hollow cleft covered with long grass, eight feet deep, and
eighteen feet broad. Too late to pull up, the foremost rode headlong
into it, some tumbled in, others over it, some rode boldly at it and
gained the other side. Still they went on, swept past the infantry
columns, and fell upon a brigade of French chasseurs.

At Balaklava 670 British horsemen were launched against an entire wing
of the Russian army. The brigade, at first in two lines, the 11th
Hussars, 17th Lancers, and 13th Light Dragoons, followed by the 4th
Light Dragoons and 8th Hussars, advanced down a gradual descent of
three-quarters of a mile; the Russian guns vomiting shell and shot
upon them, one battery bearing on their right, another on their left,
and all the intermediate ground covered with riflemen. The guns were
charged and forced through, the forces drawn up in rear were
overpowered. They then had to turn, and, retiring up hill, ran through
the same gauntlet. In the Sikh war, at the battle of Ferozeshah, the
3d Light Dragoons charged the enemy's entrenchments at a point
defended by some of their heaviest batteries. When within 250 yards
the regiment moved at speed under a destructive fire of grape and
musketry, and pressing forward at the charge entered the enemy's camp
and captured the whole of the batteries.

Cavalry attacks have been made with success after dark, and the
advantage, of course, is gained of obviating opposing fire. Prince
Kraft mentions that after the battle of Mars-la-Tour, the cavalry
division, re-enforced by the divisional cavalry, rode forward to
complete the advantages gained. It was almost night, and fault has
been found with making the attack in the dark. If the ground is well
known a night attack may be advisable. While criticising it, we have
to think of the feelings of a half-defeated army about to bivouac
being attacked by unknown forces in the dark. In this case, at
Vionville, the enemy did not wait for a second, but withdrew, and
abandoned the whole field of battle. Prince Kraft quotes the attack of
Blücher at Gross-Gorchen and a cavalry attack at Loon. During the
first Egyptian campaign the Life Guards made an attack by moonlight at
Kassassin.

I have now, I think, touched lightly on some important cavalry duties
on a campaign. In some points perhaps these remarks may appear
contradictory. How to combine keeping cavalry in reserve for any great
action it may be called upon to perform, while using it unsparingly to
assist on the battle field, if the necessity arises. It may, however,
be noticed that, much as they may be criticised, few cavalry
commanders have been severely blamed when they have thought it best to
take the bolder course. To insure to cavalry the power of carrying out
its duties successfully in war, organization and practice in peace is
most essential. Infantry may suddenly be increased without much
deranging its action in the field, but cavalry cannot be hurried into
an increased augmentation. In tactics simplicity in every evolution
and rapidity in execution are the most important principles. This
simplicity of drill, I think, might be assisted if our squadrons were
divided into four divisions, zuges, or pelotons. When squadrons have
48 files in the front rank there might be four of these, while weak
regiments with 36 files could drill equally as well with three
divisions. This system, introduced by the late Gen. Valentine Baker
into the English service for a time, and now used by all European
countries, was found to work well.

I think the whistle could be carried with advantage by all cavalry
officers. For advanced work attention can be drawn by it without being
heard at a distance like a bugle. In movements the commanding officers
would find it useful to call the attention of leaders to himself,
especially in extended or échelon formation. I have omitted to make
much mention of the action of horse artillery combined with cavalry,
as it seems beyond the limits of this paper; but it is one to which
the cavalry officer's attention requires to be brought most strongly
to bear. I would also have wished to have made some remarks on the
many advantages to be obtained by having mounted infantry attached to
cavalry. I understand that this force would be under the orders of the
cavalry general, and if so, I think a cavalry division well found in
horse artillery, with mounted infantry, whether conveyed on horses,
or, where the cavalry admitted of it, on cars, and accompanied by
machine guns on wheels, could act in such an independent manner as to
enable it to penetrate far ahead into an enemy's country, or threaten
his communications, and be absent from its main body for many days or
weeks.

As regards the English cavalry, I think it may be said, without
boasting, that the material is excellent. The men are of the best
physique, recruited from a good class, and plenty of them to be had.
The non-commissioned officers are intelligent and always ready for
instruction; the riding compares favorably with cavalry of other
nations, certainly far better than any I have ever seen abroad, either
German, Russian, or French, and among all foreign countries we have
the reputation of being the best horsemen in the world, which at all
events has a good moral effect. Our horses are undoubtedly first-rate,
having more quality and greater speed than foreigners. We have in our
officers the exact stuff we want. Their very sports and amusements
start them with all the makings of cavalry soldiers. But the quickness
of eye, the self-confidence and readiness that these sports and games
may give, require nowadays more than ever something beyond this to
produce the trained cavalry leader. Cavalry is an arm of opportunity,
and above all others depends greatly on its leaders, but with the
chances now available of reading, in every detail, the campaigns of
the past, if taken advantage of, as is now daily becoming more common,
we should produce in the future the best and most accomplished cavalry
officers that this country or any other has ever seen.

As there appeared to be a unanimity of opinion on the lecture, there
was no discussion, and the proceedings closed with a vote of thanks to
the lecturer.--_Broad Arrow._

       *       *       *       *       *




IRON SAILING SHIPS.


Messrs. Russell & Co., Greenock and Port Glasgow, show at the Glasgow
exhibition a very numerous and varied show of sailing models. First,
we find the noble four-masted ships of from 1,800 tons to 2,200 tons,
which sail and carry well on their tonnage, and which are worked by
fewer hands than are required for a ship of the same burden with three
masts but squarer yards. Some owners prefer the latter, and so Messrs.
Russell show not only such handsome specimens as the four-masted Falls
of Earn, but also the three-masted Ardencraig and Soudan. One of the
favorite models of this firm is that of their 1,500 ton ship with
three masts, represented by the Cromartyshire, of which type they have
built a large number of vessels noted alike for their carrying
capacity and their excellent sailing qualities. The Main, built for
Mr. James Nourse, of London, is a good specimen of their 1,700 ton
ship, as designed for the special trade of the owner, between
Calcutta, Demerara, and London. Their 1,300 ton bark is represented by
the model of the Aboukir Bay and her sisters of the Bay Line, owned by
Messrs. Hatfield, Cameron & Co., of Glasgow; while their 1,000 ton
barks are shown in the model of the Banca, belonging to Messrs. P.
Denniston & Co., of the same city. These are about the smallest class
of sailing ships built during recent years, the demands of the
shipping trade being such as to make it unprofitable to sail anything
smaller than about 1,500 tons; while the tendency is to exceed 2,000
tons in burden, and to reach even as high as 3,000 tons.--_The
Engineer._

       *       *       *       *       *




WATER BLAST PUMP.


It is well known that the principle which is applied to the
construction of vacuum or filter pumps, and which aims at the
production of rarefied air in a certain inclosed space, may also be
applied to the production of air _pressure_.

A simple apparatus by which this may be accomplished has recently been
constructed by A. Beutell.

A tall cylindrical flask, K (see cut), is provided with an outlet tube
near the bottom, and its stopper carries two tubes, one (M) for the
entrance of a jet of water, and the other (L) for the exit of the
compressed air, which may be conducted to a blast lamp or wherever air
under pressure may be needed. The column of water entering through M
causes air to be sucked in through the little hole at c, and this air,
after arriving in the flask, is gradually compressed by the
continuously entering water.

In order that the apparatus may work properly, it is necessary to
construct the tube, M, in a particular manner, and of certain definite
proportions. Fig. 3 exhibits its bore and shape in an enlarged view. A
short distance below the orifice of the tube it is slightly expanded,
and then gradually contracts to the place, b. It then again expands to
an oblong cavity, and contracts again to a neck, e, which is a trifle
wider than that at b, and which must be so situated that the column of
water passing through b is exactly perpendicular to the center of the
aperture at e. The tube then expands again to its original diameter,
and is slightly curved, which is done to prevent any of the compressed
air in the cylinder, K, from regurgitating upward.

[Illustration: FIG. 1., FIG. 2., FIG. 3.
               BEUTELL'S WATER BLAST PUMP.]

The outlet tube at A is preferably constructed as shown in Fig. 2.
Instead of being made of one piece, it is there represented as
consisting of two pieces joined together by rubber tubing, a sort of
check valve, G, being introduced into the rubber joint. By regulating
the check valve, that is by approaching it more or less to the exit of
the tube, A, the outflow of water may be regulated. It is important to
adjust this so that the cylindrical flask will always be at least half
full, and never over three-fourths filled. While the column of water
falls through the aperture at b, into the expanded portion of M, it
aspirates air through the little orifice, c, communicating with the
outer air, and this air is carried along with it into the flask, where
it accumulates until it is under a pressure equal to that of the
column of water entering the apparatus, when the latter will cease to
flow. By allowing the air to escape through L, more will be
successively compressed, so that a steady blast may be obtained.

The proportions between the diameters of the expanded and contracted
portions of the glass tube, M, are important. If the bore at b amounts
to 2.5 millimeters, that at e should be 3 millimeters. Under these
circumstances, and with a pressure of water equal to a column of 61.7
cubic centimeters, the apparatus will furnish 890 liters of air for
every 1,000 liters of water consumed. If the two diameters were: b, 1
millimeter, and e, 2.4 mm., one liter of water aspirates 2.35 liters
of air. These proportions are, no doubt, capable of
improvement.--_Chem. Zeit. and Ch. Centralbl._

       *       *       *       *       *




TRANSMISSION OF POWER BETWEEN BODIES MOVING AT DIFFERENT VELOCITIES.


A few months ago there was exhibited, in the society's reading room, a
working model of an application to railway working of what the
inventor calls "division of the mass." In causing a body, moving at a
high velocity, to communicate motion to another at rest, or moving at
a lower velocity, he splits one of them up into parts all the more
numerous, and therefore tenuous, as the difference in velocity is
greater; and this is accomplished by causing one of the parts to take
the form of a brush composed of metal fibers.

In applying this principle to the transmission of motion for driving
machinery, a disk, fitted with segmental brushes, is slid laterally
along the shaft, so that the fibers come into contact with radial
projections on a second disk; and, although the contact is made
instantaneously, the action is exerted gradually, owing to the
flexibility of the fibers. That is to say, the full power is
communicated without any shock.

A similar arrangement, but with one of the disks fixed, serves as a
brake for arresting motion, and this again without shock, but with
gradually increasing action. Where space is very much circumscribed,
the clutch and the brake may be combined, by fitting a disk with
brushes on one side, and projections on the other, so that it may be
brought by a lever against a second disk, for transmitting motion, and
against a third, fixed, for stopping it.

Safety appliances for arresting the descent of mine cages, in the
event of the rope breaking, have hitherto depended upon the entrance
of claws into the guides, or the clipping of the latter, or the
wedging of the cage between the guides.

In this application of the system, the guides of the shaft are fitted
with corrugated iron plates, and the sides of the cage with steel
brushes. In the normal state of working, the brushes are kept clear of
the guides, but, should the rope break, a small brush, fitted on a
sector, constantly rubbing against the corrugations of the guides,
aided by a spring or counterweight, brings the main brushes into
contact with the guides by a link arrangement, like that of the
parallel ruler, thus arresting the cage, and holding it suspended
until the brushes are gradually relaxed, for "braking" the cage slowly
down to the next landing.

Many attempts have been made to cause a locomotive, running at full
speed, to exert such a mechanical action as would set a signal to
danger, so as to protect the train from another following in the rear.
By fitting the engine with a steel brush, attached to the axle boxes,
so as to preserve a uniform height with respect to the rails, a
stationary lever may be gradually moved, so that the signal is set at
"danger" without shock. Moreover, by means of another brush, in the
event of the engine being turned upon the wrong line, a lever may be
made to shut off the steam, apply the brakes, blow the whistle, or
move an index on a dial, recording a neglect of duty, or may exert
these four actions simultaneously.

All the above applications of this principle--"the division of the
mass"--have been tested experimentally, the last named by the model
above referred to. The clutch arrangement has transmitted six horse
power from a petroleum motor, making 200 revolutions a minute, to a
dynamo making 2,000 revolutions, while applications to industrial
purposes are now being made, both in this country and in Belgium. The
inventor of the system is M. Raymond Snyers, Ingénieur des Mines, du
Génie Civil, et des Arts et Manufactures, of the Louvain
University.--_Journal of the Society of Arts._

       *       *       *       *       *




STEAM GENERATOR OF SERPOLLET BROTHERS, PRODUCING STEAM
INSTANTANEOUSLY.


The explosibility of a steam generator may be measured by the relation
of its total capacity to its vaporizing power. The old fashioned
generators and some of the modern ones are so constructed as to
contain from fifteen to twenty times more water than they are able to
vaporize within one hour. Thus a great quantity of heat is obtained
and a uniform pressure assured, but the steam-generating apparatus is
costly, heavy, and cumbersome; it requires a long time before the
necessary pressure is obtained, and the generator is only suitable for
a stationary installation and where it can uninterruptedly work for a
long period of time. Besides, the enormous quantity of hot water under
pressure constitutes a constant danger, and the explosion of a steam
generator with boiler tubes becomes a real disaster.

In order to satisfy the requirements which have newly arisen in
connection with navigation, locomotion, small motors and apparatus
which need for their working an intermittent supply of steam, it
became necessary to modify the construction of steam boilers, to
augment their heating surface, to diminish their residue of water, and
to gradually construct so-called _inexplosible_ apparatus, of which
the Belleville boiler forms one of the most characteristic prototypes.

In trying to reduce the inexplosibility to the utmost, Messrs.
Serpollet Brothers have succeeded in constructing a type of boilers
which may be called _absolutely inexplosible_, and this result has
been obtained by reducing the capacity of the boiler to practically
_nil_, thus rendering the explosibility also _nil_, for under the
circumstances the relation between capacity and vaporizing power
becomes itself _nil_.

[Illustration: FIG. 1.--INSTANTANEOUS VAPORIZATION BOILER OF MESSRS.
               SERPOLLET.

   1. General view of boiler (experimental arrangement). 2. Cross
   section of boiler (natural size). The line A B indicates, at
   somewhat exaggerated scale, the cross section of the interior
   empty space of the boiler.]

The method employed for this purpose by Messrs. Serpollet is an
extremely simple one. A cylindrical steel tube of convenient diameter
and sufficient thickness is rolled flat at a temperature below the
white heat of the metal, and the last touch of the rollers is given to
it when already cold. By this means a flat tube is obtained, the empty
interior space of which looks in a cross section (Fig. 1, No. 2) like
a black line not thicker than a hair, and measures from 0.1 to 0.3
millimeter. This tube is finally rolled up in the form of a spiral, or
left straight, according to the use to be made of it, and put into an
appropriate furnace (Fig. 1, No. 1). To either end of the tube a joint
is attached, the one for the purpose of admitting the water, the other
for admitting the steam.

When under these circumstances the tube has been heated to a high
temperature in a convenient fire box, the water which has been pumped
into it, by a feed pump fastened to one of its extremities, is
instantly changed into steam and escapes at the other end at a
pressure and in a state of dryness depending on the working conditions
of the apparatus. The ingenious and really original and novel idea in
this invention is this flattened tube, which constitutes an actual
capillary boiler inside of which the water squeezed in between its
walls cannot assume its spheroidal state, and the formation of drops
becomes absolutely impossible. There exists no longer a residue of hot
water, nor are water gauges, safety valves, or any other of those
numerous accessories required which make all steam boilers so
complicated and which augment considerably their cost.

It also becomes unnecessary to connect the joint from which the steam
escapes by means of a valve with the motor for which the steam is to
be used. If the supply of steam is to be stopped, this can be done by
simply suppressing the supply of water, i.e., by _emptying the
boiler_.

The regular working is assured by the quantity of heat contained in
the heated iron tube, to which, for this purpose, an intentionally
great thickness has been given, and it is this heat of the iron which
replaces the heat furnished by the hot water in the steam generators
with boiler tubes. From the above it will be easy to understand the
general arrangement of the new steam generator, when connected with
its motor. This motor works a small intermitting pump, which supplies
the capillary boiler with water, according to the quantity consumed.
The machine is started by means of a small special pump worked by
hand.

Whenever the velocity of the motor tends to increase, a centrifugal
regulator placed upon the motor reduces the action of the pump and,
consequently, the supply of water to the tube, thus checking the
velocity of the machine. If the velocity tends to slacken, the inverse
process is employed. In order to stop the machine, it suffices to turn
off the water furnished by the pump by means of a three-way cock, and
to send the water back to the reservoir of supply. The boiler can be
emptied in less than a second, and the motor stops in consequence of
being deprived of motive power.

The whole is marvelously simple, and creates astonishment and
admiration in the mind of even the most skeptical persons who see the
apparatus.

The boiler of the one horse power type weighs 33 kilogrammes. It
consists of an iron tube having a length of 2 meters and a height of
10.5 centimeters after it has been flattened; the total heating
surface thus obtained being 48 square centimeters. The power of
vaporization amounts to 20 kilogrammes of water per hour, while the
quantity of coal consumed during the same period amounts to only 4
kilogrammes, which is comparatively little for a boiler of so small a
power.

[Illustration: FIG. 2.--TRICYCLE PROPELLED BY A SERPOLLET BOILER]

Fig. 2 shows the first model of a tricycle constructed by Messrs.
Serpollet as an application of their boiler for locomotion. The writer
has seen the working of this apparatus, and consequently is able to
give some data. The total weight of the machine is 185 kilogrammes, or
about 250 kilogrammes when mounted by a person. The boiler is placed
behind the tricycle, the motor is under the seat, inside of which is
the water reservoir and the supply of coal. In the motor employed in
the present case the feed pump is a constant supply pump, but by means
of a directing lever turning around its own axis and acting upon a
three-way cock, the water can be divided into two streams, the one
emptying into the feeding reservoir, the other into the boiler. By
varying the position of the cock, the power of the machine can be
modified and its velocity regulated. The machine can be brought to a
stop within less than two meters by means of the combined action of a
brake and the complete suppression of water in the boiler. In order to
start the machine, the water is sent into the tube by a little extra
pump worked for a moment by the left hand of the cyclist when
starting.

On July 25 some experiments were made before the Society of Civil
Engineers with the tricycle above described, and on that occasion it
traversed the Rue Girardon and the Rue de Norvino to Montmartre
(streets in which the gradient rises to 15 centimeters per meter) with
a velocity of three meters per second.

Fig. 3 represents the arrangement of the first stationary boiler of
the new kind. The letters of reference will suffice to indicate the
position of the principal parts of it, the forms of which may be
varied according to the object for which the boiler is to be used.

[Illustration: FIG. 3.--COMPLETE VIEW OF A SERPOLLET BOILER.

   1. Exterior view. 2. Cross section. 3. Horizontal section at the
   height of the tube.]

Messrs. Serpollet are occupied at present with studying the special
arrangements which will be needed for connecting their boiler with a
quadricycle, a torpedo boat, a stove, a locomotive, or a stationary
machine of 10 horse power, and with rectangular parts.

The inexplosibility of their boiler has been tested during an
experiment made before the engineers of mines, on which occasion a
manometer (steam gauge) graduated for a pressure of upward 200
kilogrammes per square centimeter was used, and the pressure raised
far beyond the limits indicated. The result was that the hand of the
manometer, being pressed against the walls of the box, became bent,
and though the boiler was submitted to a pressure the degree of which
it was impossible to measure, it was not changed in the slightest.

Incrustation of the boiler is not to be feared, for, in consequence of
the great velocity with which the steam circulates through the tube,
the solid matter dissolved in the water becomes pulverized and is
forced out, mechanically assisting to lubricate and polish the parts
of the motor.

The invention of Messrs. Serpollet is still too new to foretell all
its possible applications, but their apparatus, in its present form,
is exactly the steam generator which will be useful for producing a
small motive force; while it will be necessary to wait until it has
been ascertained, by further study, how the system can economically be
used for high motive power.

The most natural and immediate application of the invention seems to
be its use for the electric lighting of restaurants, in which case one
of the instantaneous vaporization tubes might be connected with stoves
which remain lighted all day, and which might thus besides supply the
necessary motive force to work a small dynamo charging some
accumulators.--_E. Hospitalier, in La Nature._

       *       *       *       *       *




GAS LIGHTING BY HIGH-POWER BURNERS.


In the course of a communication presented to the Societe Industrielle
du Nord de la France by the manager of the Wazemmes Gas Company, he
made the following remarks on gas lighting with high-power burners:

For gas of a standard illuminating value, the lighting power increases
with the temperature of the flame. It also increases, under favorable
conditions, if the quantity of gas consumed by the burner in a certain
period is augmented. Thus, two burners consuming 60 liters (rather
more than 2 cubic feet) of gas, placed in juxtaposition, produce less
light than one burner consuming 120 liters. As it is impossible to
indefinitely increase the supply to ordinary burners, multiple-flame
burners have been invented, in which two or more ordinary flames are
united so that they may impinge upon each other. By an ingenious
arrangement for bringing the air into contact with the multiple
flames, two excellent types of lamps are obtained, consuming
respectively 700 and 1,400 liters per hour, which meet with a rapid
demand in Paris, and in many other towns, for lighting wide public
thoroughfares, squares, and large open spaces. If, however, it is
desired to obtain a flame with a much higher temperature, it is
necessary to resort to a special arrangement for heating the air
intended for combustion with the gas. The principle of heating the air
by means of waste heat escaping with the products of the waste
gas--the regenerative principle--was adopted by Mr. F. Siemens, and
applied not only to gas burners, but to high temperature stoves. With
the Siemens burner on the regenerative principle the following results
are obtained: With a consumption of 150 liters per hour, the light of
from 1 to 3 carcels; 250 to 300 liters, 6 to 7 carcels; 600 liters, 15
carcels; 800 liters, 20 to 22 carcels; 1,600 liters, 46 to 48 carcels;
2,200 liters, 72 carcels. Unfortunately, the construction of the
Siemens Argand lamps is very delicate, and, moreover, they have the
disadvantage of being heavy and rather unsightly. In Germany they have
been widely adopted; but in France they have met with but little
success. The Schulke lamp is made on the same principle; and this
appears to be too delicate to come into general use. One of the latest
burners of the regenerative class is the Wenham, which has been before
the public for some time in England and is now being adopted in
France. In point of fact it is merely a very effective improvement on
Breittmayer's burner, from which it differs only in its construction;
being produced in some elegant styles, which lend themselves perfectly
to the decorations of private houses. The No. 2 lamp of this type,
with a consumption of 283 liters (10 cubic feet) per hour, has given
126 candles, in a vertical direction without reflectors: horizontally,
50 candles. But the gas employed in the tests had an illuminating
power about 20 per cent. higher than that usual in Paris. When
experimenting in Paris with a No. 3 lamp in a vertical direction, it
showed a consumption of 34.6 liters (1.2 cubic feet) per carcel
obtained. The Wenham lamp is constructed to give light in a vertical
direction; and by adopting a large reflector, the illuminating power
is increased 18 per cent. in a vertical line and 55 per cent. at 80°,
which is a highly satisfactory result. There are at present five sizes
of these lamps. There is also the Delmas hot air burner, in which the
batswing flame is completely inclosed in a glass, mounted with a
sheet-iron casing, heated by the products of combustion, through which
the air passes on its passage downward to feed the flame; and it thus
increases the temperature, improves the illuminating power, and
produces a beautiful steady light. Mention also may be made of the
Siemens radiated heat burner, by means of which the heating of the air
is effected simply by the radiation of the metallic parts of the
appliance which are in contact with the flame. These burners produce
the light of 1 carcel (9.5 candles) with a gas consumption of 70
liters (about 2½ cubic feet), and are therefore, from an economical
point of view, intermediary between the high power and regenerative
burners. This degree of economy can be ascertained by an ingenious
arrangement of the air supply in a burner with holes, which has been
made in the laboratory of the Wazemmes Gas Company by M. Verlé, the
engineer, who has invented a very simple burner called the "Lillois,"
with which the light of 1 carcel is obtained with a consumption of 70
liters. This produces a tulip-shaped flame, and it has a specially
constructed glass arrangement on the outside for regulating the
combustion. Comparing the above-mentioned burners with each other, we
arrive at the following results: The "Lillois" burner consumes 70
liters of gas per carcel; the Siemens ordinary, 70 liters; the
Siemens-Breittmayer, 35 to 39 liters; the Wenham, about 35 liters.
Taking this into account, and considering that a carcel corresponds
with 105 liters of gas consumed in the Bengal form of burner, we see
that the economy in gas might, by employing these burners, reach from
33 to 71 per cent. If this is compared with the batswing burner, which
produces the light of 1 carcel with a consumption of 120 liters of
gas, the economy is greater--varying, according to the type of lamp,
from 41 to 85 per cent.

       *       *       *       *       *




SYNCHRONIZING CLOCKS.


[Illustration: DAVEY'S PENDULUM FOR SYNCHRONIZING CLOCKS.

   W, friction wheel attached to pendulum. L gives no impulse except
   when the electro-magnet is excited. K, lever and weight lifted by
   electro-magnet, E. A, open contact completed by pendulum each
   swing. B, battery. R, ratchet wheel and pawl. M, lever fixed at
   top. L, weight at end of bell crank lever, which drives pendulum
   once each minute, being raised by the electro-magnets.]

At the recent meeting of the Institution of Mechanical Engineers,
Dublin, Mr. Davey, of Leeds, spoke of synchronizing mechanisms. He had
occupied some of his spare time in attempting to synchronize clocks
from a standard clock. The problem is similar to the present one,
except that it is rough-and-ready, compared to the present one. He had
a novel electrical pendulum, to drive a seconds pendulum by
electricity. Electrical clocks are notoriously bad timekeepers; on
account of variation in the strength of the electrical current, the
battery falls off. He had constructed an electric clock having a
seconds pendulum, and recording an impulse once a minute. On the
pendulum he had a little ratchet wheel, R, having thirty teeth. The
pawl was connected with a lever, M, fixed at the top. On the face of
the wheel a little pin rotates with the wheel. On the side of the
clock case was a contact maker, which closed the circuit by the pin on
the ratchet wheel, R, once every minute. The weight was lifted by the
electric current, and by its fall gave an impulse to the pendulum. The
pendulum was a free swinging pendulum for 59 sec., and the increase of
the arc could scarcely be detected.

       *       *       *       *       *




COAL TAR AS FUEL FOR STEAM BOILERS.

By JOHN McCRAE, of Dundee.


About three years ago, when the sudden and serious fall took place in
the value of the secondary products produced in gas works, many gas
managers--ever desirous of doing their very best for their
employers--were forced to look around for some better market in which
to dispose of the products which had so seriously fallen in value.
This was no easy task; and even now it forms very uphill work indeed.
A comparatively new market has been created for the disposal of boiled
tar at several of the German ports. But the expense and difficulty of
loading ships with tar in casks take very much from the saving derived
from the new manner of disposal. It occurred to me, therefore, that we
must look nearer home for a remedy.

In all gas works of any magnitude, a considerable quantity of fuel
must be employed for the purpose of supplying the works with steam for
the exhauster engines, chemical apparatus, thawing purposes, etc.
Whether this fuel consists of coke or of coal, will not in the least
affect or alter my figures. I have no doubt if any manager discovers
that he is working more economically by selling the coke and using a
cheap small or other coal, he will adopt the cheapest process. In
Dundee, where we get a good price for coke, I found, for the purpose
of steam fuel, it would be far cheaper to buy small coal costing from
5s. to 5s. 6d. per ton delivered in the works, and dispose of the
coke. The question of fuel then lay between coal and tar; and I have
experimented somewhat extensively to ascertain the true relative
values of the two classes of fuel. For the purpose of this paper, and
within the last few days, I made a further examination into the
question; and the results arrived at will be those here quoted. The
coal we employed was what is known as Stravenhouse small coal, which
costs 5s. per ton delivered. The experiment in each case lasted 48
hours. The tar employed was what is known as boiled tar; the naphtha
having been previously removed, but the pitch oil left in the tar. The
value of this tar in Dundee is about 4s. per ton. The following are
the figures:

  Coal, 10 tons 16 cwt., at 5s.               £2 14 0
  Tar, 1,460 gallons (or 9 tons 3 cwt.
      160 gallons = 1 ton), at 4s.             1 16 7
                                              -------
  Saving per day by using tar.                £0 17 5

And this at the longest day, when we are using a mere fraction of
steam, as compared with our winter requirements, and consequently the
profit is proportionally less than it will be when we are in full
work.

[Illustration]

And now allow me to direct your attention for a short time to the
appliance made use of in accomplishing this tar burning. On the wall
is shown a diagram giving in detail the injector known as C. & W.
Walker's patent tar sprayer burner; and it is supplied only by that
firm. The tar, which has been brought forward to the boilers in a
thoroughly liquid state, is discharged from the center of the injector
into the furnace of the boiler. Surrounding the center nozzle of the
injector is an annular space through which high pressure steam passes,
also into the furnace. The meaning of this steam moving along with the
tar is to force a draught, as well as to raise the temperature of the
tar, and so partially convert the tar into vapor; thereby making the
combustion more complete. The flow of the tar is regulated by the very
delicate sluices attached to the injectors. These valves consist of
elongated cones and plugs, and are constructed not only for the
purpose of regulating the flow of tar, but also for removing any
obstruction or incrustation which may accumulate in the nozzle. In
order to keep the tar in a liquid state (which in the winter time is
not an easy matter), a small steam pipe is passed through the center
of the tar pipe; but, of course, no steam is discharged among the tar,
as the presence of water in the injector prevents its correct working.
The steam pipe is simply passed through the tar pipe, and a steam trap
attached to its end. In changing from the coal or coke fuel to the
tar, little or no difficulty is experienced, and very rarely is a
shovelful of any kind of solid material required. The furnace bars
have only to be kept covered to prevent the waste of tar and the too
rapid ingress of air; and when the furnaces are in full work, and
being well and carefully attended to, the tar will be found to have
been nearly all consumed before reaching the solid material covering
the bars. The action is very much the same as in the paraffin oil
lamp. The wick is the medium by which the oil is brought to the point
of combustion, where it is developed into light; but the wick remains
little injured, although in close proximity to such intense heat. The
oil burns, not the wick. In the tar furnace, the tar itself burns, and
the tar only.

It will be easily understood that a little experience is necessary to
enable the attendant to fully understand the quantity of tar by which
complete combustion is to be obtained, and which in no case must be
exceeded. The moment one atom of tar is sent into the furnace beyond
that which can be thoroughly consumed, you have then the most hideous
discharge of black smoke (carbon) which it is difficult to describe,
but which can be easily understood, and, I believe, can be seen within
a few miles of where we now sit. I should mention that the injectors
are fitted on the furnace doors; but the connections are of such a
nature that the doors can be opened without disturbing any of the
permanent fittings.

And now I have told you that the results detailed in this short paper
were those obtained in the Dundee gas works. This is so; but were I to
leave the matter here, it might be inferred that I considered similar
results might be obtained in any and every gas works. I would not
mislead you; and therefore must detain you for a few moments longer in
order to show you how my town is different from many others. Dundee is
very peculiarly situated in this respect. It is a long distance from
any tar distiller's works capable of dealing with the large quantity
of tar we have for sale during the winter. A large portion of the
value of our tar must, therefore, go to the railway company, to cover
the cost of transit between the two points, and so the tar distiller
can allow us but a small figure for it at the starting point. Then
again, Dundee being far distant from the coal fields, the coal is
exceptionally high in price. I quite believe that in many of the west
country towns the coal for which we are paying 5s. per ton could be
had for 3s.; and the tar for which we are receiving 4s. per ton, they
would get not much under the double of this. Therefore, you see, in a
place so circumstanced, the figures I have given would be most
misleading. Still, I doubt not there are places as badly situated as
Dundee; and it is to such places that my remarks are directed. I
believe also that, in many towns distant from collieries, the tar
might be sold to manufacturers for use in their steam boilers; and
such an arrangement would, I think, prove advantageous both to the
seller and the user of this liquid fuel.

I think that as much has been said in regard to my subject as is
necessary; but permit me to add that I believe there is a future for
liquid fuels. I do not say tar, but more concentrated fuels, such as
crude naphthas, paraffins, and pitch oil. When you see one of our
large steamers taking coal into her bunker, it must have appeared to
you that there was great waste of power here. Every ton of coal laid
in must require a certain amount of power to carry it; and every ton
of coal so laid in reduces the cargo-carrying power to this extent. A
few gallons of oil will give you the steam-producing power of a ton of
coal; and this is a fact which the owners of non-paying steamships
should note. Take our locomotives also. Everything I have said in
regard to steamships applies to them; and the comfort to the stokers
and the general reduction in labor would be very marked indeed. Of
course, it may be argued that if there were such a large demand
created for oils for furnaces, the old fashioned law of supply and
demand might come into play, and so force up the price of the article
for which the increased demand had taken place. But I think this state
of matters is rather remote, when we bear in mind the great oil wells
only now becoming developed, and the oils from which can be run in
bulk direct from the wells into ships, and brought to this country at
very low rates.--_Journal of Gas Lighting._

       *       *       *       *       *




WATCH CLEANING AND REPAIRING.

By "OLD FOGY."


Before proceeding with what I consider the best methods in this
department of the watch and jewelry business, I will say that I do
not, by any means, consider that my way is the best, for although I
have been in the business quite a while, yet I find that I learn
something new almost every day that I live, and expect to do so, so
long as I continue in the business. Be very particular in selecting
your tools; about three widths of screwdrivers, and keep them in the
best of order, square across the point of blade, and never use a
screwdriver too narrow nor too wide for the screw, and in using be
careful not to let it slip, and thus mar the plates or bridges of a
watch. I also recommend that the handles of these screwdrivers be of
different shapes or styles, so as to save time in picking up the one
you want (and just here I will say that every device or method that
saves time will be of great value to the operator); then have about
the same number of tweezers (3), one of good, solid, heavy points, say
1/16 inch wide at the points, for taking down a watch, and handling
the heavier parts, and then one a little finer, and one very fine to
work in about the train, hairspring, etc., and always keep these
tweezers in perfect order at the points, so that whatever you handle,
you will not mar or drop the things you are handling. Right in this
connection I will say that I cannot find tweezers that suit me. So I
make my own, and you can do the same if you will by selecting some
nice steel. Then a good assortment of pliers, cutting, flat, and
round. In selecting brushes, you will have to be very particular and
secure the open and straight bristle brushes, which are also hard to
find these latter years. Take all the coarser brushes and hold them on
a coarse grindstone, running them whole length, both ways; this takes
off the new rough end of the bristles before using first time. Then
there are punches, broaches, drills, calipers, countersinks, files,
etc., etc. Besides this, I have adopted the plan of making any tool I
happen to need for any special purpose, so that by making these at the
time I happen to want a tool that I cannot purchase, I have
accumulated quite a variety of odd tools; among them are a varied lot
of millers, for milling and raising jewels, and deepening the
countersink holes for jewel settings and screw heads, also a tool for
holding a roller, to set the jewel pin, and one for holding the hair
spring collet, and a pair of tweezers for holding jewels while
cleaning, etc., etc. As to lathes, I have found that there is a
necessity of about two lathes; one a Swiss, light running lathe for
cementing any pivot work, and I prefer these because they run much
lighter and easier than those heavier American lathes; and yet if
confined to but one lathe, I would use a small sized American lathe,
with a good assortment of split chucks, particularly those with the
smaller sized holes, for holding balance staffs, wheel arbors, etc.,
which come in use almost everyday, for taking off the burr from the
point of a balance pivot, which has come from a collapse of the case;
driving the end stones down on the end of pivots, even sometimes to
the extent of heading them over inside of the hole jewel. These small
size split chucks I have found extremely useful for the last named
purpose, and I am not so "sentimental" but that I oftener use these
split chucks, even for setting fine balance pivots, rather than take
time to cement them; and while I do not advise the use of a split
chuck for this purpose in every case, yet with a little experience one
can tell when a staff is held so that the new pivot when set will
"line" and be true, and of a clear beat or swing. To make a very nice
pivot the cementing process is preferable, and yet, for nearly a year,
my old No. 1 American lathe was not set up (for reasons I need not
take space to explain), and during that time I employed a very
skillful workman to do my pivoting, and this man would not think of
ever doing a nice job unless he cemented it, and I can assure you that
he put in more pivots out of line, and out of true, in the course of
those few months, than I had done badly in my life. Speaking of
"sentiment," I will say that too many young workmen use the lathe too
much, and seem to depend on a fine looking lathe and handsome tools,
and spend too much time in using the lathe and in decorating their
bench with a fine display. But don't construe this as meaning that one
can do nice work with a jack knife and handsaw, for I most certainly
believe in a good and substantial set of tools, or I would not have
taken so much space in speaking of them. Next, one must have a good
bench, wide and of good length: and if no other drawers, a shallow
depth drawer, exactly in center of the bench, with no knob in front,
but rather a lip running its whole length, underneath. So that
wherever you place your hand you can pull it out. This drawer I would
have large and roomy (wide and long and extending back as far as the
depth of the bench will allow, but shallow, not deep down in), and
then partition it off by narrow slats, diagonally across it, running
these slats from the extreme near right hand corner to the further and
extreme left hand corner, so that as you reach your right hand in to
take out a tool, you can grasp it naturally without twisting or
cramping your hand. About eight inches below the top of the bench, I
would place a skin drawer (the name comes from the practice at watch
factories, formerly using sheepskins for the bottoms), which is made
with a square frame (say like a picture frame), sliding on slats or a
groove, so that it can be drawn out toward the operator, and when so
drawn, the elbows will rest on this frame, with the wrists resting on
the edge of the top of the bench, thus giving a firm support for both
arms and hands, and this frame having stretched across its bottom a
skin or canvas, will catch and retain anything that drops or rolls
from the bench. This latter drawer I consider almost an indispensable
article to doing good and successful work. At the right hand of these
two drawers named, running down to floor if need be, there can be a
series of drawers for tools and materials. Now with these equipments,
and some others, not herein named, such as vise, file block, bench
stake or anvil, and a large variety of such tools as will accumulate,
I am ready to give you my ideas regarding the cleaning and repairing
of watches. First and foremost, do not undertake any job that you have
any or considerable doubt but what you can do successfully, and never
leave a job worse than you found it; and never mar, cut, or slash any
part of a watch. In other words, don't undertake a job that you have
doubts as to whether you can do it correctly. One of my old masters
told me never to undertake to improve on the maker's work, and this,
while not true in every case (particularly cheap watches), yet is a
safe rule to go by. Never allow your file, screwdriver, pliers,
tweezers, or any tool to deface any part of a watch. I shall speak of
this as I proceed. First, be careful and not let the movement swing so
as to in any way injure the balance, in taking from case, and if a
lever watch, take out the balance the first thing after getting out of
case. Now see that the mainspring is let down and then remove the
screws from the plates, taking care not to damage or bend any of the
pivots as you do this. When all in pieces, before you proceed to
clean, examine with a strong glass to see if the rim of any wheel is
rubbing or clashing with anything, particularly the center wheel in
any full plate American watch, for these wheels are often dragging on
the plate or striking the ratch wheel because it is not true, and if
examined before cleaning the places where it drags, are a tell-tale of
the mischief. Also make any diagnosis of the watch that is needed to
discover any errors from wear or accident, and correct them before
going further, such as looking to each jewel, pivot, and other parts,
and make all necessary repairs before cleaning. I have been in the
habit for several years of putting my balance wheel separate from all
connections, and trying its freedom in all positions, and if you will
try this method, you will be surprised how many you will find that
bind or are not perfectly free in all positions, when you give them
the very slightest impulse by a twirl of the hand, holding the plate.
Then, too, a careful examination of each jewel; you will be surprised
how many are either loose in the setting or plate. In regard to
cleaning, I use the old method (after trying all ways suggested)--that
of chalk (but I use the old lump chalk, for those carpenters' chalk
balls are made with some kind of paste that adheres to the plate)--and
have this lump of chalk at my right hand, in a perforated bottom box,
so that any coarse pieces fall through to the floor, and by rubbing
the brush across it and then giving it a slight rap, before applying
it to plate, any hard or heavy substance will fall out, and then with
light pressure with the brush that is medium soft (and prepared on
grindstone as before mentioned, if a new one) brush the plates, with
an occasional breathing on the surface, clean the old oil or tarnish,
and then peg out each hole many times, until you are sure every hole
is clean, by pegging both sides, and then with a soft dust brush dust
thoroughly by striking the brush into the holes on both sides. Of
course, remove all end stones, and clean out with soft pith, holding
the jewels in a pair of hook nose tweezers, mentioned. Should the
plates and wheels be very much soiled and oily, a covered dish of
alcohol is indispensable, and I have had a glass stopper bottle, with
ether, in which to dip the jewels, pallets, and other small pieces,
which takes the oil all off, but be sure and clean off with soft pith
or pegwood such pieces as you have thus dipped. This ether will carry
all loose lint or other things to its bottom, from hairsprings or
roller table, and if held but a moment will do effective work, and not
loosen shellac.

Regarding loose jewels, I am not so sentimental as to refuse using
some shellac, if the burnished lip has been so thin as to be partially
gone, thus loosening the jewel to hold in the jewel, by taking small
and minute particles, and placing around the edge of the jewel, and
then holding the plate or bridge over an alcohol flame, and allowing
the shellac to flow around the jewel and fasten it firm, and by this
process I have kept jewels firm in place for years, with no other
attention than the first, and as a rule this can be done and not show.
When you have thoroughly cleaned the different parts, holding
everything with soft tissue paper, then with the paper put the watch
together, never forcing any part into place, and when screwed or
pinned together, try every wheel to see that there is the proper end
and side shake to each pivot, then introduce the balance wheel, having
been once tried alone as described, and see that the banking pins are
so adjusted that the guard pin on the fork (lever) does not drag on
either side, and that the jewel pin enters the slot, clearing the
opposite corner, and that the guard pin is so in position that it will
not allow the pin to pass by at any point and bring the jewel pin
outside the lever, or so it will strike in hollow, or on the corners
of the hollow of the roller. When you have oiled each pivot exactly on
its connecting point of bearing with just the right amount of oil (of
course, oil those jewels having end stones before putting watch
together), your watch is ready for the dial, and in replacing the
hands you cannot be too particular about their being free and clearing
each other and the dial and glass. There is the care of the mainspring
I have intentionally reserved till the last. There are lots of
theories why a spring will break just after cleaning, but I only know
that since I have adopted the method of never taking out the spring
(except when, after taking off the cap of barrel, I find it is all
gummed up with bad oil, and then of course clean it) I have found that
a spring does not break any oftener than is common, even if the watch
is not cleaned; but I invariably remove the barrel arbor and clean out
the holes and the arbor itself.

Of course to explain every detail of the method of repairing the
various parts of a watch would take more space than you would allow in
your journal, and hence I will not attempt to go into minute detail,
except perhaps some of the more important items, and the most common
things found in everyday experience. Among these are broken pivots,
worn pivots (sometimes requiring new ones), worn holes in plates, and
at the intersection of barrel arbor, ratch and bridge of Swiss
watches, etc., which, as a rule, require common sense as much as
practice, and it varies in different watches, so that the common sense
rule applies the best to nearly all of these, and if you have not got
common mechanical sense, then you have mistaken your calling and
should do something else. In any of these repairs don't go it blind,
but study your case carefully and do the best thing you study out.
When there is a worn pivot hole in a plate, and one side is
countersunk for oil, then have a punch rounded at the point, just the
shape of the countersink (and if you have not one make one, and here
is where my rule, that of making a tool as the need comes for it,
comes in play), and by screwing this punch into the vise, and with a
smooth, flat point punch (slightly cornered of course) in one hand and
holding the plate or bridge with the other, with the countersink on
the punch, have a striker tap light and quick blows, and you move the
punch around on the side most worn (and one side is almost invariably
worn most, throwing the wheel arbor out of upright) and close up, even
a little too much, and then with a round, smooth broach enlarge it, so
that it will be right size, and this leaves it hard and smooth.

Broken pivots, as I have hinted, I place the arbor in a split chuck,
and if true, I drill into the staff with a drill, made from a nice
piece of steel wire, the old and ordinary shape of a drill, which is a
trifle larger at the cutting point than it is back of the point, and I
make these as I need them, and harden simply by holding the wire in a
flame till red hot, and then dash into an apple, potato, soap, or pure
rubber. Which is the best of these I have as yet been unable to
determine, so I use either as the most handy. Take a good, tough and
small pointed graver and turn a slight center in the end of arbor I am
to drill, and then by giving my lathe a back and forward motion, I
begin to drill, and by the sense of feeling I can tell whether my
drill is cutting or not, and if not, I have a small, smooth oilstone
at hand and sharpen the drill as often as it refuses to cut, and if
that drill will not cut, I make another.

I make my drills of very small wire, filing them at point and then tap
the point (holding the wire in a very fine pin vise), thus flattening
as well as spreading it, and then shape the cutting edges as spoken of
above. When you have drilled sufficiently to hold a plug firmly, then
have a piece of steel of spring temper filed so as to fit closely and
so straight that it will not act too wedging (and split the arbor),
drive it in, cut it off and turn down, finishing with an oilstone
slip, and polish by running the lathe rapidly and with a piece of thin
boxwood (or hard pegwood) charged with diamantine, being sure that the
end of the pivot has no burr, thrown either way, over end or on side,
for such a burr will cause a lack of freedom of a balance pivot
particularly. This matter of setting pivots requires a longer
experience than almost any other work, and it needs a long practice to
do a nice job. If your split chuck will not hold your staff or arbor
true, then use cement; but in this, too, you must be sure that your
center is true, and that the sound pivot enters it perfectly.
Sometimes you meet with steel so hard that you cannot touch it with a
drill, in which case draw the temper of the staff or arbor you are
drilling, and if it projects so little that you cannot draw the temper
without injury to the wheel, then unstake or separate the wheel, and
by drilling a hole into a piece of brass wire, about the size of the
staff you are drilling, insert the staff in this hole, and then heat
the wire near the staff and thus gradually and yet effectively draw
the temper.

I consider it well for young workmen to practice pivot setting in some
old and useless watch any spare time they may have, and thus become
adepts at this work. Unhindered, I am not over on an average of
one-half hour in setting any ordinary pivot, especially if I do not
have to cement my work. If this is a balance pivot, be very careful to
see that your balance is true and poised before putting on hairspring
and roller. There are some pivots that are underturned (to make look
tidy and light), and sometimes it is about an impossibility to put in
a new one, and in this case, if an American watch, I always put in an
entire new staff, and hence keep a full assortment on hand.

Regarding replacing broken jewels, I also keep a full stock of these,
turned (the setting) to match any make or style of watch; except, of
course, Swiss watches, and for these I keep a large assortment of
sizes, both of cock and foot and wheel jewels, and a full stock once
procured, they last a long time and are a good investment, for with
them you can meet any emergency.

In a Swiss watch, or any watch where the jewel is set into the plate,
have some one of the devices for throwing up the burnished lip, and
then select a jewel that just fills the space, and then with a smooth
pointed punch, such as I described I used for closing up a pivot hole,
I turn this lip back by sliding this round pointed punch around the
outside, making it act as a burnish. Cap jewels I either treat in the
same manner as the last, or cut away the setting, and insert them as
they are inserted in most Swiss watches.

I have now taken up the more common repairs, and will close by hastily
speaking of the more rare cases, and the adjustment of the hair
spring, etc., etc. It is often the case that there is never end shake
to the balance to make it absolutely safe when screwed into the case,
and when this happens I take the point of a sharp graver and prick up
a burr on the bridge, and never on the plate, as any unskilled workman
does, for the under side of the bridge never being finished, you
really mar nothing, and sometimes this raising of the cock (or bridge)
becomes a necessity, to have it clear the rim of the balance, which,
if raised, it will clear, and then by bending down the end of the cock
at point where the jewel is, and thus regulate the end shake. I hardly
know how to give directions how to proceed in adjusting hairsprings,
when they are disarranged, but if I could see you, I could explain by
example what I cannot well do in words. To commence, a hairspring,
when there is no power applied to balance from the jewel pin, should
be, when pinned, just as free from any twist or cramping as it would
be if lying flat and free on a smooth piece of glass, before it has
been pinned at either end, and when it is pinned in the watch (at stud
and collet) it should be thus free. To bring it thus requires
demonstration that cannot be made on paper, unless you could make
diagrams, too numerous for this article.

What I have said regarding it, however, gives an idea of how a
hairspring should be pinned. Common sense is demanded here as
elsewhere. To put a watch in beat, too, is a very important item,
which I do by placing sharp pointed tweezers, first on one side of the
arm of balance and then on the other, and so pin my hairspring in the
stud, that it will let off as readily on one side as the other. I had
forgotten to say that every watch should have a little oil on the face
of the pallet stones. I know full well that some workmen will say that
there should be none, but I can tell of scores of watches that have
failed and indeed stopped simply for want of oil on the pallets.
Selecting mainsprings, too, needs much more care than is usually given
to this department, and as a rule even the watch factories fill the
barrel too full, that is, too long springs. Whether I am correct in
this or not, you cannot be too particular in selecting the right
strength, length, and width of mainsprings. Mainsprings should be well
and carefully oiled.

There are many ways of replacing broken teeth in wheels, and the width
of the web and the size of the teeth has much to do with how they are
put in, but I usually dovetail them in, and then with the very tiniest
bit of soft solder fasten them, but in so doing be positive you have
got off all soldering fluid, that it will not rust the pinion into
which it meshes, and be very particular to have it exactly like the
rest of the teeth in same wheel, and don't mar the web of the wheel
more than is possible.

I will now draw this article to a close, well appreciating the fact
that I have only made a superficial attempt to instruct younger men in
the cleaning and repairing of watches, for there is almost an endless
variety of special repairs coming almost unexpectedly to any one, even
if they have been in the business a long time, as I have, and as I
first said, I am learning daily some new phase of the business, and am
surprised that I never had known it before. I have, too, taken perhaps
more space than I ought, regarding tools and bench, yet the older I
grow, the more I can see the importance of this part, that I may be
enabled to do work well and quick. Besides, I have left such repairs
as the chain and fusee, uprighting wheels, repairing cases, adjustment
to position, heat and cold, isochronism, enlarging jewels, or changing
angles of pallet stones, etc., etc., all of which I do as necessity
demands, as well as the care of striking watches, fly backs, etc.,
which, too, I make a specialty of, and of chronometer escapement
watches, which would take more space than I feel disposed to ask you
to give me.--_American Jeweler._

       *       *       *       *       *




THE NEW CENTRAL RAILWAY STATION AT FRANKFORT ON THE MAIN.


The new central railway station at Frankfort on the Main is one of the
most imposing structures of modern times, not only as regards its
dimensions, but also because of the effect which its architectural
proportions produce upon the eye. Nobody looking at the long line of
buildings surrounded by gigantic perron halls can help being impressed
with their grandeur. The beholder, however, is not only struck by the
general aspect, but also by the beauty of detail in this magnificent
specimen of the Renaissance style. The interior of the perron hall
shown in one of our engravings is especially impressive, and every one
will admire the graceful outlines of the heavy iron structures in the
upper part, which, in consequence of their enormous height, look from
below like a spider web.

The base and the earth works were begun in the summer of 1881, and if
we take into consideration the fact that 2,700,000 cubic meters of
sand and gravel were necessary for the foundation, we will have some
idea of the scale on which the edifice was undertaken. In 1883, the
great hall, which has a width of 220 meters and which will shortly be
opened to traffic, was begun. The perspective view of this portion of
the station is given in one of our engravings. Inspector Eggert had
the general management of the building, which was erected after the
plan submitted by him, and which received the prize in the competition
between the different architects. Herr Frantz, a distinguished
engineer, who undertook the general supervision of the construction,
had an important part in the execution of the entrance hall for the
trains, and it was he, also, who built the perron hall, after designs
of Herr Schwedler.

The middle part of the station, which contains the porch, the ticket
offices, the baggage department, the police quarters and the telegraph
offices, projects, as shown in the picture, considerably beyond the
rest of the building, and by the distinct membering of its moulding
stands out conspicuously from the whole. Protruding portals of
peculiar structure and corner pavilions enliven the aspect of the
wings of the edifice, the great round arched windows of which are
separated from each other by powerful stone pillars. The corner
pavilions to the left in the view contain the so-called imperial
apartments for the reception of royal travelers, and on the other side
are the meeting hall and reception rooms of the different railway
administrations. On the right and left of the imposing main vestibule,
which is distinguished by the strength and the beauty of its style,
lobbies with arched roofs lead to the waiting and dining rooms, the
ladies' rooms, the imperial apartments and the above mentioned meeting
hall of the administration.

[Illustration: THE NEW CENTRAL RAILWAY STATION. FRANKFORT ON THE
               MAIN.--Drawn by Fr. Schurmann.]

The ladies' and gentlemen's toilet rooms also are in that part of the
building.

The architect has laid especial stress upon the architectural
ornamentation of the building. Upon the apex of the arch over the main
vestibule a great group will be placed, representing Atlas carrying
the world on his shoulders, and supported in his work by the
allegorical figures of Steam and Electricity.

This group, which is at the present moment being executed in copper by
Houwald, in Brunswick, is the work of a Frankfort sculptor, Herr
Gustav Herold. In the arch itself, near the clock, we see two
allegorical female figures, over life size, in a sitting posture,
modeled by Prof. Gustav Kaupert in Frankfort, and representing Day and
Night. In front of the pillars supporting the arch, two other female
sitting figures, also above life size, will be perceived. These were
modeled by Professor Calandrelli in Berlin, and represent Agriculture
and Commerce, and in the niches on both sides there are the statues of
Navigation and Industry, the work of the sculptor Hundrieser, of
Berlin. The two side portals of the entrance hall are surmounted by
figures of boys, having a height 2.40 meters; on the left the
commercial traveler and traveling student, modelled by Rudolph
Eckhardt in Frankfort; on the right the traveler for pleasure and the
emigrant, the works of the sculptor Scholl, of Mayence. The groups of
the corner pavilions, allegoric representations of machine building
and engineering, were modeled by Professor Max Wiese, of Hanau. The
figures, like the whole building, are of Heibronn sandstone. Either
wing has a vestibule leading to the middle perron of the great hall.
They resemble in style the architecture of the front of the middle
building, only their arches are smaller. Here also we meet rich
architectural ornamentation on the pillars in the great arch. The
ornaments consist, as in the former case, of allegorical figures of
boys. They have a height of 2.20 meters, and represent Agriculture and
Art Industry on the one side and Art and the Retail Trade of Frankfort
on the other side. The two former figures are the work of the sculptor
A. Brutt, of Berlin; the two latter were modeled by Hermann Becker, of
Frankfort. The side facades are very long, but of simpler style than
the front of the building, and connect with the perron halls, which on
their part end in semi-towers. There the offices of the
administrations are located. The main vestibule leads directly to the
middle of the perron in the large hall, which consists of three naves,
and into which enter the trains of six railway lines, each separated
from the other by perrons. The perron hall has a length of 186 meters
and a width of 168 meters. The height of the naves, with their low
arched roofs, rises in the center to 28.5 meters. Tunnels connect the
different railway lines, in order to assist the rapid transit of
through trains. The port also benefits by these tunnels. The inside
front of the main vestibule is very richly decorated. In its center a
large clock is situated, and on both sides of it are colossal
allegorical figures modeled by F. Kruger, of Frankfort, and
representing the hours of Morning and Evening, while on the pillars we
perceive large male figures in a sitting posture, representing the
Defense of the Country and Mining, the work of Herr Keller, of
Frankfort. The pillars are crowned by groups of sculpture,
representing the Honeymoon Travel and Instruction in Traveling, the
one modeled by A. C. Rumpf, and the other by Friedrich Schierholz, of
Frankfort.

The whole edifice is fire proof, scarcely any wood having been used in
its erection. The hall as well as the other parts of the building are
heated by steam and lighted by electricity. The whole cost of the
structure amounted to about $8,500,000.--_Illustrirte Zeitung._

       *       *       *       *       *




THE COMMERCIAL EXCHANGE, PARIS.


At the beginning of the year 1881, the committee on finances of the
common council of Paris received a petition from the central committee
of the syndical chambers asking for the establishment of an official
exchange for merchandise and commercial transactions for the especial
use of Parisian commerce. To this petition was added a project of
organization which proposed the appropriation of the grain market,
with a clearing of the approaches. The Paris chamber of commerce had
likewise been for a long time contemplating the establishment of a
merchandise exchange, and was studying the practical means of
organizing it.

Called upon to decide, the common council, at its session of May 28,
1881, decreed that an official merchandise exchange for the commerce
of Paris should be organized, and that the grain market, or any other
place considered favorable by the administration, should be
appropriated.

Desirous of aiding in carrying out this decree, the chamber of
commerce offered its services to the city. It proposed to take upon
itself the responsibility of organizing and managing the exchange, and
of borrowing the money necessary for converting the grain market into
a merchandise exchange, and for clearing the approaches and opening
Louvre Street.

The study of this project soon became connected, by reason of the
proximity of the places, with the one having for its object the
enlarging of the central markets and the construction of two pavilions
to complete them. It was recognized that it would be of interest to
make the appropriation necessary for the enlarging of the markets and
to unite the two operations. After many vicissitudes, this project
received the approval of the common council.

[Illustration: FIG. 1.--EXTERNAL VIEW OF THE COMMERCIAL EXCHANGE OF
               PARIS.]

The contract for the work was given on the 2d of March, 1886, to Mr.
Blondel, the well known architect.

Let us now see how the contract has been followed out. The grain
market was built in 1767, upon the site of the hotel of Soissons. Of
this, nothing was preserved but the astronomical tower of Catherine de
Medicis, which still remains. The central part of the market left free
was soon covered with a wooden framework, which was destroyed by fire
in 1802. This was then replaced by the architect Brunet with an iron
cupola covered with sheet copper. This market was designed for the
reception of the grain and flour necessary to supply the city, but was
soon supplanted by public granaries, and then by general stores. It
afterward became a depot in which grain and flour brokers received
merchandise from shippers in order to effect a sale of it. The
abolition of the _factorat_ gave it its last blow.

Let us examine the transformations made by Mr. Blondel in the old
structure. He began by excavating under the entire extent of the
market a basement 13 ft. in depth. The old foundations of the circular
walls, which are more than 6 ft. thick, and which are extremely solid,
extend to a depth of about 2½ ft. beneath the surface. The ceiling of
the basement, in the annular part between the walls, is formed of
large T iron girders, resting upon the circular walls. These support
transverse girders, which, in turn, support the floor irons.

The flooring of the hall is formed of ordinary floor irons, assembled
upon large girders, which are supported here and there by cast iron
columns. Under this flooring there is a second one, leaving a free
space of about ten inches, in which will be placed the tubes serving
for ventilation. To these pipes will be joined vertical ones
debouching in the flooring of the hall.

The old dome did not have apertures enough, and the skylight even was
not transparent, and so the lighting of the hall was very defective.
The mode of covering the dome was therefore completely modified. The
copper was removed, and upon the old framework was laid a wooden
framework, to which will be nailed laths designed to receive a slate
roof. The slate will not extend to the summit of the dome, but will
leave above it a spherical cap, which will be glazed, and through
which the light will enter the hall in abundance.

[Illustration: FIG. 2.--INTERNAL VIEW OF THE EXCHANGE.]

In the basement will be installed the ventilating and heating
apparatus. Another part of the basement will be occupied by the dynamo
machines that are to furnish the electric light. Another part will
receive the bake ovens that belong to the laboratory of the committee
on grain and flour. The rest of the basement will be rented. The
central part will probably be converted into a cold room for the
preservation of early fruit and vegetables.

On the ground floor, we find, in the first place, the rooms that the
contractor is to furnish gratuitously for post office, telegraph, and
telephones, and to licensed brokers, and especially a hall of superb
dimensions designed for the public sale of raw materials by the
brokers.

What remains of the ground floor will be devoted to offices looking at
once upon the hall and Viarones Street. The entresol and the two
stories will be connected by several staircases. The various stories
will also be reached through elevators. A circular balcony will extend
around the hall at the level of each of the two upper stories. These
will be occupied by offices smaller than those on the ground floor,
which will, some of them, get their light from the hall, and others
from the street.

A part of the second story will be reserved for the service of the
committees on grain and flour, who, as experts, are called upon to
determine to what type each specimen is to be referred.

From the exchange, let us pass to the annexes. The one on the right is
destined to become a large hotel for the accommodation of provincial
and foreign merchants. The one to the left will be a tenement house,
with shops and apartments. Along each of these annexes, on Viarones
Street, will extend a covered colonnade.--_Abstract from Le Genie
Civil._

       *       *       *       *       *




A BASIS FROM WHICH TO CALCULATE CHARGES FOR ELECTRIC MOTOR SERVICE.[1]

   [Footnote 1: Read before the electric light convention, New York,
   August, 1888.]


The theoretical side of the electric motor question has been very ably
presented to and discussed by this association, but thus far the
practical side has been somewhat neglected.

It will be my purpose in this paper, if possible, to show that there
is a general average controlling the use of machinery which it will be
safe for electric light and power companies to follow in making their
charges for motor service, rather than adopt an arbitrary price per
horse power regardless of the character of service required of the
motor.

I have arranged what might be called a power curve, representing the
approximate average actual service in electric motors in connection
with the several classes of work represented in the list accompanying
the diagram.

This curve is calculated on motors which are only of sufficient
capacity in each case to carry the full load. If the motor should be
larger than is necessary to drive the machinery, the percentage of
actual service will, of course, drop below that shown in the diagram.

By adopting a basis of averages which shall be general among members
of this association, the charges for a constant horse power of current
may vary with the circumstances of its first cost in each case, but
the general classification of motor service may be a comparatively
fixed rule. I am not prepared to say that this is the best plan to
follow, but respectfully submit the following as a possible solution
of the frequently asked question, "How shall we charge for electric
motor service?"

       *       *       *       *       *





EXHAUST FANS.


First on the list of power consumers is the exhaust fan, taking it in
average use. There are, however, circumstances under which its use
will be limited to as low as 70 or 75 per cent. of its contract hours
of service. As, for instance, in a dining room it may be cut out
except during meal hours, or entirely cut out on cool days. In places
of this description, however, its contract use is usually limited to
five or six months in the year, and other than electric power is, by
circumstances of first cost and inconvenience, but a feeble
competitor.

The first four applications on the accompanying list, viz., exhaust
fans, blowers, ceiling fans, and fan outfits, are all more or less
subject to the foregoing conditions, and therefore currents supplied
to motors for these purposes command the maximum price per horse
power. One important feature in the installation of ceiling fans is
the countershafting to the motor. In one recent case we had a
complaint from a customer that the half horse power motor sent him
would not drive the ceiling fans, and that the motor must be
defective, and should he return it for repairs. We immediately sent a
representative to find out the difficulty, which was found, as is
usual in such cases, in the countershafting, or rather the want of it.
The 3 in. pulley on the motor was connected to a 6 in. pulley on the
line shafting. The rated speed of the motor was 2,000 revolutions, and
had it been able to develop this speed, would have driven the line
shaft 1,000 revolutions and the fans a relative speed. To accomplish
this would probably require a motor of 3 or 4 H. P. The line shafting
driving ceiling fans usually runs about 75 revolutions. To give this
speed on the line shaft with a rated speed of 2,000 on the 3 in.
pulley of the motor would require a countershaft with a 24 in. pulley
belted to the motor. On the same countershaft should be a 5 in. pulley
belted to a 15 or 16 in. pulley on the line shaft. Fully three-fourths
of the trouble found in electric motors arises from improper shafting
and belting. The average make of 30 in. exhaust wheel, a ½ H. P. motor
should drive about 400 revolutions. Say, then, the speed of the motor
is 2,000 and the pulley 3 in., it would require a 15 in. pulley on the
fan to do the work. A 36 in. wheel requires 1 H. P. to develop the
same speed. If the motor speed is 1,800, the pulley 4 in., it would
require an 18 in. pulley on the fan to do the work. These are the most
popular sizes of exhaust wheels.

The next application on the list, open tank elevator pumps, commands
the highest price for current per H. P. in the motor of any elevator
application. The methods of operating the open tank hydraulic
elevators in question are undoubtedly familiar to you all. Instead of
the usual steam pump, a power pump of some approved design is
substituted, and connected to the motor by suitable countershafting to
give the required revolutions at the pump. The regulation of the motor
in this case should be controlled by the position of water in the
lower tank, as in the case of the steam pump. And in this connection
let me suggest the necessity of great care, both in installation and
insulation.

On all installations in basements and cellars or elsewhere where there
is the slightest tendency to dampness, raise the motor off the floor
on a suitable frame or stand and build around it on all sides of
possible approach a low platform, using glass insulators as legs or
standards to support it. So arrange this that the motor or its
connections cannot be reached except when standing on this insulated
platform, and the liability to a shock will be reduced to the
difference of potential between the terminals of the machine. To
return to the subject. Let us take for an illustration an elevator
using 120 gallons of water per trip and consuming one minute in making
its entire up trip or about two per round trip. The lower tank or
water supply is on a level with the pump. The upper tank is 70 ft.
above the pump, and in the piping to the upper tank are five elbows.
For each elbow add 2 ft. to the elevation, or an approximate total
elevation of 80 ft. × 120 gallons gives us 9,600 foot gallons. This
amount would be required every two minutes if the elevator was in
absolutely constant operation, or 4,800 foot gallons per minute × 8½
gives us 40,800 foot pounds. This we must at least double to allow for
friction in pump shafting, etc., making 81,600 foot pounds, or about
2½ H. P., say 3 required in the motor.

This class of elevator is confined almost entirely to passenger use.
Therefore the service required of the motor is much more constant and
the margin between the H. P. hours contracted for and the H. P. hours
of actual service much smaller than in any other elevator use,
excepting possibly the services in connection with pressure tank
elevators in the more popular office buildings. In this case we have a
maximum average use of 80, and instances such as the hotels, small
office buildings, etc., where the service will not exceed 60 of the
contract H. P. hours. In order, however, that the electric light
company shall derive the greatest benefit from this inconstant
service, the installation and wiring should be the best, and only the
most approved and economical apparatus employed.

The next application on our list, pressure tank pumps in connection
with elevators, represents a somewhat smaller percentage of H. P.
hours of actual service in the motor as compared with the possible H.
P. hours than in the case of an open tank pump. In case of the
pressure tank the water reserve is usually limited, and the motor
therefore must be equal to the continuous operation of the elevator at
maximum load. Taking this fact into consideration, and the
circumstances of elevator use being about the same in this case as in
the case of the open tank elevator, we have a greater ratio of
difference between the possible or contract H. P. hours in the motor
and the H. P. hours of actual service, the maximum average use being
about 70 per cent. to 75 per cent. and the minimum as low as 35 per
cent. to 40 per cent., depending, of course, on the character of
building in which the elevator is employed or the character of
service. In calculating the size of motor required on an elevator of
this description, a very convenient fact to remember is that every
pound of pressure per square inch is equivalent to lifting water about
23 ft., or about 230 ft. per 100 pounds pressure, By reducing the
required pressure to a relative lift in feet, and knowing the amount
of water required by the elevator per minute, the motor calculation
becomes the same as in case of the open tank elevator, the same
allowances being made for friction, etc., as in the first case. The
regulation of the motor in this case should be accomplished by the
conditions of pressure in the pressure tank, as is the case with a
steam pump employed in this service.

The next application of importance on the list is sewing machines. In
the tests I have been able to make on this class of work I have
obtained some singular results. One item of importance is the fact
that the single thread machines, which are lightest running, consume
the most power in operating. Paradoxical as this may seem, it is
easily explained. As a rule this class of machine is used on light
work, such as shirts, ladies' underwear, etc., and operated at a
higher speed than any other class of machine. At equal speed the volts
consumed on a single thread machine as compared with a shuttle machine
is about as 2 to 3. In average commercial use, however, the positions
are reversed, and the ratio of volts consumed in the single thread as
compared with the shuttle machine is about as 5 to 3. To double the
speed on a sewing machine requires about 2½ times the power. The
difference in volts consumed on the different makes of sewing machines
is so small that we may disregard it entirely, as well as the
character of work done by the machine, for the heavier the work the
slower the speed, and more frequent and longer stops on the machine,
thus keeping the average volts per operator about constant in all
cases. This leaves the speed in stitches per minute at the sewing
machine the factor from which we must calculate the power required in
a sewing machine plant. To illustrate this I will give you the record
of two cases which are about the average. Case No. 1 is a shop in
which are 30 sewing machines connected to a 2 H. P. motor. At the time
tests were made there were but twenty operators at work, leaving ten
idle machines, the entire shafting, however, being in operation. The
class of goods manufactured in this shop is a cheap grade of cotton
and wool pants, rather heavy goods to sew. A volt meter across the
terminals of the motor gave the following readings with the current at
9 amperes: Minimum 90 volts, maximum 148 volts, average 119, which
gives us a minimum average per operator of 4.5 volts and a maximum
average of 7.4 volts, or a general average of 5.9 volts per operator.
This motor was driving the shafting for 30 machines, and as the
average operators employed the year round will not exceed 75 per cent.
of the shop capacity, it will, I think, be entirely fair to estimate
the average volts per machine rather than per operator, as the user of
the motor has contracted for power sufficient to drive his entire
plant. In this case, then, we have a minimum average of 3 volts per
machine and a maximum of 4.9 volts, or a general average of say 4
volts per machine. A 2 horse motor of 82 per cent. efficiency with 9
amperes of current will require about 200 volts to develop 2 actual H.
P. Two hundred volts therefore is what the electric light company
contract to deliver, while, in reality, they deliver only 129 volts or
60 percent., or a minimum average of 90 volts or 45 per cent. of the
power contracted for. These machines were making about 1,200 stitches
per minute--an average of 4 volts per 100 stitches.

Case No. 2 is a shop in which there are 32 machines, running about
1,200 stitches, each being supplied with an individual motor of 1/8 H.
P. capacity, and the class of goods manufactured being men's summer
clothing, such as white duck vests, flannel coats and vests, etc., the
duck from which these vests are made being about as hard work on a
sewing machine as can be found. In this shop were 24 operators at
work. The maximum volts in this case were 116 and the minimum 40, or
general average of but 78 volts, or about 2½ volts per machine with 4
more operators than in the first case, in which we had an average of
119 volts. This shop has been paying the electric light company $32
per month for more than a year, which is the price the company charge
for current for a 4 H. P. motor which approximates 400 volts, the
company contracts to deliver. This gives us a minimum average use of
but 10 per cent. and a maximum of 29 per cent. with a general average
of 19½ per cent. In other words, the company is saving in this shop
the price of a 1/8 H. P. motor each month, besides making a profit on
the volts actually delivered. On a contract for three years the
electric light company would be money in pocket if they would present
the customer with 30 small motors, charging him $1 per month per motor
for current, rather than let him buy a 2 H. P. motor to operate the
same machines with the necessary shafting at a charge of $18 per month
for current. Taking this average in case No. 2 of 2½ volts per
machine, from a 50 light machine, we could run not less than 900
sewing machines, or about 18 to the arc lamp. At $1 per month per
machine an income of $900 per month would be derived from a 50 light
machine without any lamp expenses, such as carbons, repairs on lamps,
globes, etc. On the average, in case No. 1, of 4 volts per machine, we
could operate but about 562, say 600 machines. Divided up in shops of
30 machines and a 2 H. P. motor to each shop, we would have 20 two H.
P. motors. At a charge of $18 per month each, we would have an earning
capacity of but $360 per month from the same 50 light machine.

This is but one page from the thus far unwritten history of the much
maligned small motor. Still the question is frequently asked, "Can we
sell current for $1 per month for a small motor driving a sewing
machine and make a profit?" As a matter of fact, 50 cents per month
for small motors driving sewing machines yields a better profit to the
company supplying the current than $10 per month per H. P. in large
motors to drive the same machines, besides the immense advantage which
the small motors possess of keeping the circuit in much better
balance, the fluctuations due to the stopping and starting of large
motors being at times a serious matter. One electric light company,
making rather a specialty of these small machines, rent the motor and
supply the current for $1.25 per month per sewing machine, and report
that at this price the motor pays them a better percentage of profit
than their lamps. This company have some 200 small motors on their
circuits.

A more striking illustration of the advantages to the electric light
company in the subdivision of power into the smallest possible units
it would be hard to find. There is a difference in efficiency of from
15 to 20 per cent. in these two sizes of motors, but this difference
is fully lost to the large motor in driving the shafting, and the
small motor still has the advantage of being out of circuit entirely
when the machine it is driving is stopped. There is scarcely a
manufacturing industry which does not possess its busy and dull
seasons. This means that in no industry will over 75 per cent. of the
machines or machinery employed be in average operation. The entire
shafting in the shops must be kept in operation the entire year, often
for less than 50 per cent. of the machinery. Subdivide these same
shops into as many small units as possible, and the current necessary
to operate the shafting for this idle machinery will be saved, besides
the saving from frequent stops while the machinery is in active use.

To return again to the list, the next two applications, picture frame
manufacturers and moulding manufacturers, are very similar. Their busy
seasons, as a rule, are in the spring and fall, and also follow
closely any activity in house building. In the case of the larger
manufacturers in this line, a maximum average of 75 per cent. will
possibly be reached, but probably never exceeded. In the case,
however, of the picture dealer who has a small shop in which he makes
picture frames and mouldings to order the actual service of the motor
will fall as low as 25 per cent. or 30 per cent. of its contract
hours, one case in our experience the actual service having reached
this low average. A fair general average in this class of works would
be about 60 per cent.

The next application, nickel and silver platers and buffers, are good
contract customers as a rule; one case in our experience showing but
an average use of 20 per cent. of the contract horse power hours.
This, however, is probably an exceptional case, and, as near as we can
estimate on this class of work, the actual motor service will not
exceed in any case 60 per cent. of the contract hours; a fair average
being probably 45 or 50 per cent.

The next two applications, printing presses on news and job work, are
probably met with more frequently than any other. On exclusively news
work, the instances where the motor is in service more than 3 or 4
hours is rare. It is, however, usual in news offices to find two or
more job presses. If the newspaper printed happens to be a morning
paper, the hours of news work are usually between 12 midnight and 4
o'clock in the morning, the job work being done through the day. I
have in mind a case of this description. In the shop is one cylinder
press and three job presses connected to a 2 H. P. motor. This motor
is on an incandescent circuit of 110 volts. To develop its rated power
at 110 volts would require about 16 amperes in the motor. An ampere
motor in series with the motor while running off the morning paper
with only the cylinder press in operation stood at 12 amperes. For 3
hours this load was practically constant, when it was thrown off
entirely. This gave on the night service but 30 per cent. of the
contract hours. This motor required 5 amperes to drive the shafting,
and but 8 amperes or one H. P. to drive the three job presses with the
cylinder press off. Here then is but a 50 per cent. use if the presses
be used constantly; there are, however, many days when they are
comparatively idle, 30 to 40 per cent., therefore, is a very safe
estimate of the maximum use of this motor on the day circuit, or, had
the motor been a 1 H. P., which would have been sufficient to drive
the job presses, the use would be 60 to 80 per cent. of the contract
hours, probably not above 60 per cent. All printing offices will
probably come within this range, unless the motor be larger than is
necessary to do the work.

Machine shops doing principally lathe work as a matter of course use a
larger percentage of their contracted power than shops doing lathe and
bench work with the same hands. In no case will the service of the
motor exceed 65 or 70 per cent. of its contract use, for machine
shops, like sewing machine shops, will never average over 75 per cent.
of the shop capacity for operators the year round. The average,
especially in the case of a shop doing much bench work, will fall as
low as 40 per cent.

The driving of laundry machinery, which is our next application,
usually proves a profitable contract, according to reports. This fact
arises from the intermittent use of the machinery. The heaviest
service on motor will probably be found during the early part of each
week, with a general falling off in work during the summer months,
while the patrons of the laundry are away at the sea-shore or in the
mountains. In this application, therefore, a 75 per cent. service
would probably be an exception, with, probably, many instances where
the service would fall below 50 per cent.

The next application, model and pattern makers, are small users of
power, as their occupation requires a large proportion of hand work.
50 per cent. service in the motor will be found a fair average maximum
use, with instances as low as 20 or 25 per cent.

The next application, direct power or belt elevators, is another
application frequently met. The average service in the motor is also
much smaller than in any other elevator application. Let us suppose a
case of the familiar grip connected to the ordinary hand hoist, with a
lifting capacity of 2,000 pounds. In this case the motor is in use
only going up, and the usual brake is used in coming down. Connected
to this elevator, in the loft of the building, we have a 5 H. P. motor
wired to a cut-out on the ground floor. We will call the lift 45 feet
and the time consumed per trip 1 minute. We will allow 60 full trips
of the elevator at full load, at 2,000 lb. per trip, each day. This
would approximate 10 car loads of merchandise handled by the elevator,
which is certainly above the average. This motor, we will say, is on a
ten hour day circuit. Its possible horse power hours, therefore, would
be 5 H. P. for 10 hours, or 50 H. P. hours per day. 60 trips of 1
minute each gives us exactly 1 hour's service of the full 5 H. P. or 5
H. P. hours. To drive the shafting only while the elevator is coming
down or idle would require about 150 volts or 1½ H. P., and if this
was in constant operation the balance of the day, 9 hours, its total
use on shafting would be 13½ H. P. hours, which, added to the 5 H. P.
hours, gives us a grand total of 18½ H. P. hours, or 37 per cent. of
the contract hours. If, however, the user of the motor avails himself
of the cut-out box, and cuts the current out when the motor is not in
use, the average use would drop to 20 or 25 per cent., instead of 37
per cent. In the case of a direct power passenger elevator, the use
might possibly run up to 60 per cent., but this would be exceptional.

Coffee mills will average from 40 to 60 per cent. of their contract
hours, manufacturing jewelers about the same, while retail jewelers
will run as low as 25 per cent. Ice cream freezers will not average
over 25 per cent., but as the contract season in this case is usually
short, they should be rated at least a 50 per cent. basis, except
possibly in cases where the customer pays the cost of installation and
wiring, which is usual in these cases.

A dentist is one of the smallest of power users, so small, in fact,
that if every one in a city were connected with a circuit, the load
from this cause would never be felt. We will, however, put them down
at from 10 to 20 per cent.

The optician uses a motor to turn his grind stones, and its use in
this case will average from 20 to 30 per cent.

The last application on the list--church organs--uses only from 10 to
20 per cent. of the contract service.

These are, of course, but few of the very many applications of the
electric motor, and if, as I trust, the possible subsequent discussion
of this general plan may establish a basis for rating motor
applications, not only will the objects of this paper be obtained, but
a question of considerable annoyance now existing between the motor
man and the electric light or power company will be solved.

In conclusion, Mr. Chairman, I beg to suggest that the supply and
rates of charge for electric power have become of sufficient
importance to this association to be represented by a permanent
committee, whose duty it should be to obtain from the different
members of the association, as far as possible, their experience in
the supply of power in such manner and form as shall be deemed by the
committee best suited to the wants of this association.

       *       *       *       *       *




SOME ABYSSINIAN CUSTOMS.


[Illustration: WOMAN WITH UNDRESSED HAIR.]

[Illustration: ABYSSINIAN HAIR DRESSER.]

Abyssinian women have an extraordinary head of hair. The hair, though
not very long, is very bushy, so that it takes the capillary artist no
less than a day to succeed in reducing this forest into a small bulk.
As it requires some force to draw the comb through the hair, the
operation is painful, and this is why the Abyssinian women have it
performed every forty or fifty days only. The Abyssinian women of rank
pass their life in almost complete idleness, occupied almost
exclusively in bedecking themselves and in making or receiving calls.
It is not the same with the women of the people. They have many labors
to perform, and are the ones who manipulate the grains, hydromel and
beer, and grind pepper in the _matt-biett_. This latter operation is
very painful, and so they take the precaution to first close the
nostrils with plugs of cotton. Women who have children of a tender age
go at these operations with their progeniture upon the back, after the
manner of negro peoples.--_L'Illustration._

[Illustration: A PEPPER GRINDER.]

       *       *       *       *       *




HOW A MOUND WAS BUILT.


"While exploring mounds in Ohio this season, under the direction of
the National Bureau of Ethnology," says Mr. Gerard Fowke, in a paper
prepared for _Science_, "I used great care in the examination of one
mound in Pike County, in order to ascertain, if possible, the exact
method of its construction.

"The mound was built upon the site of a house, which had probably been
occupied by those whose skeletons were found. The roof had been
supported by side posts, and at intervals by additional inner posts.
The outer posts were arranged in pairs a few inches apart, then an
interval of about three feet, then two more, and so on. They were all
about eight inches in diameter, and extended from two and a half to
three feet into the ground, except one a few feet from the center,
which went down fully five feet. All the holes were filled with the
loose dark dirt which results from decay of wood; a few contained
fragments of charcoal, burned bones or stone, but no ashes; nor was
the surrounding earth at all burned.

"Around the outside a trench from three to four feet wide, and from
eighteen to twenty inches deep, had been dug, to carry away the water
which fell from the roof. Near the middle of this house, which
measured about forty feet from side to side, a large fire had been
kept burning for several hours, the ashes being removed from time to
time. The ash bed was elliptical in form, measuring about thirteen
feet from east to west, and five from north to south. Under the center
of it was a hole, ten inches across and a foot deep, filled with clean
white ashes in which was a little charcoal, packed very hard. At the
western end, on the south side (or farthest from the center of the
house), was a mass of burned animal bones, ashes, and charcoal. This
was continuous with the ash bed, though apparently not a part of it.
The bones were in small pieces, and were, no doubt, the remains of a
funeral feast or offering.

"After the fire died down, rude tools were used to dig a grave at the
middle of the house. It measured ten feet in length, from east to
west, by a little more than six in breadth. The sides were straight,
slanting inward, with rounded corners. The bottom was nearly level,
fourteen inches deep, but slightly lower at the center. Over the
bottom, ashes had been thinly sprinkled, and on these a single
thickness of bark had been laid. The sides had been lined with wood or
bark from two to four inches thick. When this was done, two bodies
were placed side by side in the grave, both extended at full length on
the back, with heads directly west. One, judging from the bones and
condition of the teeth, was a woman of considerable age. She was
placed in the middle of the grave. Her right arm lay along the side,
the left hand being under the pelvic bones of the other skeleton. This
was apparently of a man not much, if any, past maturity. The right arm
lay across the stomach, the left across the hips. This skeleton was
five feet ten inches in length; the other, five feet four inches.

"The space between the first skeleton and the south side of the grave
was covered with the ashes that had been removed from the fire.
Beginning at the feet in a thin layer--a mere streak--they gradually
increased in thickness toward the head, where they were fully six
inches thick. The head was embedded in them. They extended to the end
of the grave, reaching across its entire width and coming almost, but
not quite, in contact with the other head. A considerable amount of
the burned bones lay in the southwestern corner of the grave, and the
ashes along this part curved up over the side until they merged into
what remained of the ash bed. This had extended to the west slightly
beyond the end of the grave.

"As the earth removed from the grave had been thrown out on every
side, the bodies were in a hole that was nearly two feet deep. The
next step was to cover them. There was no sign of bark, cloth, or any
other protecting material above them. They were covered with a black
sandy earth, which must have been brought from the creek not far
distant. This was piled over them while wet, or at least damp enough
to pack firmly, as it required the pick to loosen it, and, besides,
was steeper on the sides than dry dirt would have been. It reached
just beyond the grave on every side, and was about five and a half
feet high, or as high as it could be conveniently piled.

"So far, all was plain enough; but now another question presented
itself that puzzled me not a little; and that was, What became of the
house? That there had been one, the arrangement of the numerous post
holes plainly showed; but the large earth mound above the tumulus or
grave was perfectly solid above the original surface, giving not the
slightest evidence that the posts or any part of the house had ever
reached up into it. I incline to the opinion that the great fire near
the middle of the house had been made from the timbers composing it;
that the upper timbers had been torn down, and the posts cut off at
the surface, the whole being a kind of votive offering to the dead. At
any rate, it is plain that a house stood there until the time the
mound was built; and it was not there afterward.

"For the purpose of covering the grave, sand was brought from a ridge
a short distance away. There was no stratification, either horizontal
or curving. Earth had been piled up first around the black mass
forming the grave mound, and then different parties had deposited
their loads at convenient places, until the mound assumed its final
conical arrangement. The lenticular masses through almost the whole
mound showed that the earth had been carried in skins or small
baskets. The completed mound was thirteen feet high, and about one
hundred feet in diameter.

"Two and a half feet above the original surface was an extended
skeleton, head west. It lay just east of the black earth over the
grave. Sixteen feet south of the grave, on the original surface, and
within the outer row of post holes, were two skeletons extended, heads
nearly west. It would seem that the flesh was removed before burial,
as the bones were covered with a dull red substance, which showed a
waxy texture when worked with a knife blade.

"No relics of any description were found with any of the skeletons;
but a fine copper bracelet was picked up in a position that showed it
was dropped accidentally."

       *       *       *       *       *




A CHINESE IMPERIAL CEMETERY.

By Lieut. Hon. H. N. SHORE, R.N.


Some ten miles north of Peking, in a valley where silence reigns
supreme, is situated one of the most remarkable and imposing burial
grounds in the world. Here, nestling along the slopes of the inclosing
mountains, which form a natural amphitheater, are a series of vast
mausoleums where lie buried the emperors of the last Chinese dynasty.
This was the celebrated Ming dynasty, which continued from 1366 till
1644, when, after a sanguinary struggle lasting for twenty-seven
years, it succumbed to the Manchu Tartars, who, under the title of the
Tsin dynasty, have occupied the throne to the present time.

[Illustration: THE AVENUE.]

It has been very truly remarked of the Chinese that they have probably
expended more labor over their public works than any other nation of
antiquity; and assuredly when any great national work is undertaken,
however rare the occurrence, it is invariably carried out on a scale
of unparalleled magnificence. It was, therefore, only fitting that the
tombs containing the emperors of their own native dynasty should be
constructed on a scale commensurate with the wealth and extent of the
empire whose destinies they swayed for nigh 300 years. The valley
contains altogether thirty tombs, each of which stands in the center
of a wooded inclosure several acres in extent, surrounded by a high
wall, with an imposing gateway. The largest and most celebrated is
that of Yen-wang, whose body reposes in a lofty building resting on an
immense brick mound pierced by a slanting tunnel, whose curious
acoustic properties entitle it to be ranked as a "whispering gallery."
In front of the mausoleum is a hall measuring 220 ft. long by over 90
ft. broad, which contains the emperor's tablet. The roof of this
building is supported in the center by thirty-two pillars, composed of
single trees 60 ft. high and over 11 ft. in circumference, which are
said to have been brought from Corea. The transport of these enormous
blocks must have been a work of no ordinary difficulty, more
especially in the absence of good roads. According to the description
of a missionary who recently witnessed the moving of a somewhat
similar object, it would seem that the Chinese followed the practice
of the ancient Egyptians, as depicted on their tombs, and in a country
where labor is abundant such a method would be natural.

An inscription near the entrance states that this tomb, among others,
was repaired by the Emperor Kienlung, who reigned in the early part of
last century; but like every other ancient building in China at the
present day, it is fast going to ruin for the want of ordinary care,
large trees being permitted to grow out of the very roof itself,
although there are several attendants residing in the inclosure;
while, doubtless, certain officials are entrusted with the care of
this splendid mausoleum, and draw their salaries regularly. But
_laisser faire_ is the order of the day everywhere in the neighborhood
of Peking, and nothing is ever repaired nowadays by any chance.

[Illustration: THE ROAD TO PEKING.]

A part of the original scheme, which shows the magnificent scale on
which the whole thing was planned and executed, was a fine paved road,
carried over streams and rivers by marble bridges and extending the
whole way from Peking, a distance of ten miles. On approaching the
valley where the tombs repose the road passes under three handsome
"pailaus," or gateways, and then through one of the most imposing
avenues that was ever constructed. This avenue, which extends for
about two-thirds of a mile, is flanked on either side with colossal
stone figures at intervals of about 50 yards, representing men and
animals in the following order: Six men, apparently warriors and
priests, in pairs, standing; four horses, four griffins, four
elephants, four camels, and four lions, the first pair in each set
standing, the second recumbent. As the Chinese have never achieved any
great distinction in the art of sculpture, the representations of
animal life are, needless to say, somewhat caricatured. But the
conception of the whole was magnificent, and the effect of this long
avenue of colossal figures standing in silent grandeur is as
impressive as anything that ever emanated from the genius of the
Chinese race.--_Ill. Naval and Military Magazine._

       *       *       *       *       *




DYSPEPSIA: ITS CAUSES AND PREVENTION.


Dyspepsia has once been called the "American sickness," and although
this may be a slander against which many of the inhabitants of our
great republic might protest, bad digestion is a disease frequent
enough among us to justify us in considering its causes and in
ascertaining by what means this curse of modern civilization may be
avoided. A Frenchman, under the title "La dyspepsie des gens
d'esprit," in the Paris _Revue Scientifique_ of August 18, shows how
utterly disregarded are the sanitary rules at the dinners of well bred
people in France; and an American lady in a recent edition of a well
known New York daily humoristically enlarges upon the offenses
committed against health by persons of her own sex while dining in the
largest city of the United States. Speaking of the lunch of shop girls
up town, the contributor to the American paper deprecates the fact
that the young American girls employed in business houses at luncheon
time live almost entirely on sweets and food that renders little or no
nourishment, rather than procuring at the same cost a repast which,
though perhaps less dainty, would be far better for their
constitution. "Left to herself," the writer says, "Miss Saleslady,
pretty and refined though she may be, day after day and day after day
keeps her temper, and waits on her customers, leaning on a slim
luncheon of pie and tea. 'It is sweet and nice,' pleaded one girl to
me the other day, 'and it goes so much further than anything else.'

"'Not further than bread and milk' I urged, 'and it is surely not half
as good for your complexion.'

"'Oh, but the other ladies would laugh at me well if they saw me
eating bread and milk for my luncheon. I think myself a bit of
something light and nice, like eclairs or a charlotte russe, is ever
so much more ladylike and nice.'

"Heaven save the mark! What sort of flesh and blood do they make to
put on the slender bones of a growing girl? How will they stand by
her, when perhaps she leaves the shop and chooses the life of wife and
mother? The answer is easy. When the pie-eating, cooky-feeding girl
gets married, put it down in your note book: One more dyspeptic,
peevish woman entered the lists of the unlovely."

The contributor to the French review, although also condemning the
careless choice of food, more especially points out the evil
consequences of eating too hastily; and though M. Julva directs his
attack chiefly against the _gens d'esprit_, i.e., the well bred people
of France who neglect the rules of health for politeness' sake, his
words apply equally well to the American business man who sacrifices
his health during luncheon to the "almighty dollar."

"The feverish activity of modern life," he says, "induces many people
to abridge the duration of their repast, and, particularly, luncheon
is taken too hastily--a practice the danger of which, as a cause of
dyspepsia, cannot be overrated."

This practice might not be so dangerous if, during the short time
which we dedicate to our midday meal, we would at least imitate the
habit of the Japanese, whom politeness requires to be absolutely
silent while eating. When they like a certain dish, they express their
satisfaction by graceful gestures addressed to their host, but they
think it would offend him if they open their mouth for anything else
except eating.

Watch, on the other hand, one of our lawyers at luncheon. He has just
dismissed his last client, at the moment when he should be already at
court, and in order not to be too late he has to lunch in double quick
time. He has to eat his viands without having time to masticate them,
and he swallows his big pieces, washing them down with several glasses
of wine and water, and hastens to his carriage almost without giving
himself time to breathe, in order not to miss his call.

Look at a Parisian dining in town. French politeness forbids him to be
silent like the Japanese, and also requires of him not to speak with
his mouth full of food. And if this were not enough, French gallantry
commands him to serve the ladies first, so that just about when they
have finished, he may commence to eat. In addition to this, if he does
not want to appear ill bred, he must reply to all their questions,
which he would not be able to do if he did not gulp down his morsels
unchewed. What wonder, then, that most men have to suffer from eating
dinner in such a manner, while all discomfort could be avoided, if the
viands were served to one guest after the other in succession?

We don't want to exaggerate. There are privileged stomachs which can
stand all that. But there are many to which half-masticated food is a
real poison.

The unconscious dyspeptic constitutes an extremely frequent variety.
Dyspeptics rarely complain of suffering from the stomach; many of them
will even say to you that their stomach is excellent. But let us
remember the old fable of Menenius Agrippa: The whole organism suffers
when the stomach is ill treated.

Premature calvity (baldness), some eruptions of acne (pustules of the
skin), a slight dyspnoea (difficulty in breathing) when mounting
stairs, a blush of heat on the cheeks a quarter of an hour after
luncheon, a violent craving for smoking after the repast, a feeling of
sleepiness, which, however, quickly fades toward ten o'clock in the
evening, little inclination to work during the first hours after
awakening in the morning, all these symptoms, or any part of them,
show that you have before you a candidate of the disease known as
bloating of the stomach or the gout. According to the wise enumeration
of Moliere, who was evidently prompted by Renaudot, such a person
begins with bradypepsia (slow digestion), then suffers from dyspepsia
(bad digestion), afterward from apepsia (indigestion), and later
lyentery (a lax or diarrhea in which food is discharged only half
digested), and at the last the vicious circle is often completed by
obesity, uric affections of the liver or bladder, and all the other
diseases belonging to that class.

Unfortunately, we are still far from the time when the public will
appreciate that "prevention is better than cure." Perhaps this
fundamental principle of health will be honored during the 20th
century. At present it certainly is not. Meanwhile, those who have
ruined their health by modern city life take recourse for their cure
to a holiday, hasten to places where they find mineral waters, or try
laxatives or milk diet to improve their condition. They wish _to do
something for their health_ once or twice a year. How much better, if
they had not been _acting against their health all the year round_.

It is extremely difficult to teach our people to eat healthily. You
will find no difficulty to persuade them to take medicine. People have
always time to swallow a pill, but you will certainly have trouble to
teach them to chew with leisure. How many people who find time every
year to spend the season at Vichy will tell you it is quite impossible
for them to spend five minutes more every day at luncheon time. And
nevertheless they would regain these few minutes a day with interest,
if they would avoid that host of maladies which will stop them one day
in the midst of their occupations. I have seen a good many of my
clients getting entirely rid of their rheumatic pains and gout and
ceasing to suffer from sleepless nights by observing the following
simple rules.

In order to chew meat conveniently--and this is one of the main
points--one must accustom one's self never to mix meat and bread in
the same mouthful. Take a small mouthful, chew it about thirty times,
then swallow that part which has been reduced to pulp, and so on until
all has been masticated. In doing this you will soon find out that
roasted and broiled beef or mutton requires a longer trituration than
boiled meats or stews; you will also perceive that fish is more easily
masticated than meat, and you will finally understand why certain
dyspeptics are forced to limit their food to fish, eggs, and milk
diet. In fact, milk diet serves no other purpose than to furnish a
perfectly digestible nourishment.

One of the indirect and unforeseen benefits of a careful mastication
is that people gradually become accustomed to be satisfied with a
comparatively small quantity of food, for as slow chewing is always
more or less tedious, those who observe this rule soon cease to be
great eaters, and also learn quickly to accustom themselves to another
very important rule, viz., to drink moderately while eating. Two
glasses of liquid will then quite suffice for a person who would drink
four if he ate his viands swallowing them down without chewing.

Many obese dyspeptics when they once commence to masticate carefully
and to take liquid moderately while eating lose weight with an
astonishing rapidity and become cured of the bloating of the stomach
without being finally obliged to have recourse to the rigorous dry
diet of Prof. Bouchard.

Wine and water, the French national drink, is an extremely frequent,
and very often misunderstood, cause of dyspepsia. A good many people
would enjoy excellent health if they were satisfied with pure water,
that favorite drink of the aged. It is quite perplexing sometimes to
see at the same table three neighbors, drinking at their dinner, the
one wine, the other beer, and the third tea. How much better would it
be if people, instead of choosing their habitual drink according to
the place that they come from, would select it more with regard to
their individual constitution! I know many who, after having, for
fifty years, quietly ignored the fact, have come to the recognition
that for them, wine, even if diluted with much water, is absolutely
hurtful, and who, by giving it up, and by taking pure water, tea, or
cider, to which Prof. C. attributes great success in his practice,
instead, have got rid of their ailments almost as if by enchantment.

In conclusion, I should like to say a word with regard to salt, this
panacea of arthritic persons (persons suffering from arthritis,
swelling of the joints, as in gout).

For many years I have been laboring under the wrong impression, that
salt is placed on the table merely for the purpose of salting boiled
eggs, which the cook cannot salt in advance. Great mistake! The wisdom
of nations has discovered that there are people for whom a great
quantity of salt is a necessity, and that there are others who would
become ill if they were to eat viands that are much salted. The salt
cellar is there in order to enable every one to salt his food
according to his own requirements. Many people are led by their
natural instinct to salt their viands in a proportion to suit them.
But there are others, among them, above all, the well bred persons
previously mentioned, who treat eating with disdain and for whom the
whole attraction of a repast is the charm of conversation, and to them
the idea of having recourse to the salt cellar never occurs.

Whether salt is needed in order to add acid to the gastric juice or
whether it has an antiseptic action in the digestive channel, I do not
know. Certain, however, it is, that it possesses very appreciable
laxative qualities, and under its influence those who go to drink the
waters at Wiesbaden often see their intestinal functions restored to a
surprising degree.

It is just as well, however, and even better, to take one's _Vichy at
home_, and nothing is more simple than to use one's _Wiesbaden at
home_, by using the salt cellar. The cure may then be completed by
distributing over a whole year the thirty warm baths which have to be
taken during the season at that watering place. The bath at 40°
Celsius is a real boon for arthritic persons. The warmer it is,
whether salt or not, the better it acts in producing an exuberant
perspiration, and the less is one apt to catch cold when leaving it.

The above by no means exhausts the vast subject of dyspepsia and
arthritis. But without ignoring the utility of thermal waters, of
morning promenades, of dry frictions and gymnastics, the sufferers
should, above all, be advised to minutely masticate their food, to
limit the amount of liquids at meal time, to use salt, which will by
no means increase their thirst; and in certain cases to abstain
entirely from alcoholic drinks. Those who observe these rules may with
impunity dine out, although those so-called great dinners, where all
rules of health are left aside, are absolutely baneful for a great
number of the inhabitants of our cities.

       *       *       *       *       *




A NEW SURGICAL OPERATION.


Among the matters of interest which were brought before the British
Medical Association, at the recent Glasgow meeting, was an account by
Mr. Brudenell Carter of a method which he had devised of opening the
sheath of the optic nerve behind the eye, for the relief of pressure
within this sheath and within the cavity of the skull. The brain is
invested by firm membranes, which secrete a certain amount of fluid
and are continued down to the eye in the form of a sheath which
surrounds the optic nerve; and, whenever the pressure within the
cavity of the skull is increased, as by the growth of a brain tumor,
or even by excess of secretion from the membranes themselves, a
superabundance of fluid is apt to find its way down the nerve sheath
to the level of the eye, to subject the optic nerve to injurious
pressure, and, in many cases, to destroy the sight. It not
infrequently happens that the pressure within the brain cavity may be
increased by temporary or curable causes, which, nevertheless,
continue in action sufficiently long to produce permanent blindness,
even although the patient may, in other respects, recover. In view of
these conditions it was suggested by Dr. De Wecker, of Paris, sixteen
or seventeen years ago, that it might be possible to open the optic
nerve sheath, and thus not only to relieve the nerve from pressure and
to preserve it from injury, but also, on account of the position of
the eye relatively to the brain cavity, to drain the latter by
gravitation, and to relieve the brain as well as the eye. Dr. De
Wecker made two endeavors to accomplish this object, but he tried to
feel his way to the optic nerve without the aid of sight, and to
incise the sheath by means of an instrument carrying a concealed
knife, capable of being projected by means of a spring. The risks of
failure, and, still more, the risks of inflicting irreparable injury
upon the nerve, were such that he only attempted his operation in two
well nigh hopeless cases, and only one attempt to follow his example
has been recorded. Mr. Carter's attention was called to the matter
last year by a case in which the diminution of pressure within the
optic nerve sheath was manifestly desirable; and he devised a method
of operating by which the sheath could be exposed to view, and the
object attained with certainty, under the guidance of sight at every
step of the process.

He read before the Medical Society of London, last year, an account of
the first case in which he operated, which was successful; and he read
an account of three more cases at Glasgow, in one of which the result
was negative, as far as sight was concerned, while in the other two
the patients were not only quickly restored to useful vision, in one
instance from complete, in the other from nearly complete, blindness,
but were at the same time relieved or cured of other symptoms, such as
headache and sickness, arising from direct pressure on the brain. In
his paper at Glasgow, Mr. Carter claimed for the new operation that it
could be performed with certainty and without risk either to life or
to any important structure, and that it afforded a reasonable prospect
of the preservation of sight in many forms of disease in which it is
now habitually or frequently lost. As in the case of every new
operation, time and further experience of its effects are required in
order to determine the precise limits of its usefulness.

In the discussion which followed the paper, Mr. Bickerton, of
Liverpool, said that, in consequence of reading the account of Mr.
Carter's first case, he had himself performed the operation in two
instances, in one of which temporary restoration of sight was followed
by relapse, while in the second the ultimate issue was
favorable.--_London Times._

       *       *       *       *       *




PUTZEYS' FLUSHING RESERVOIR.


Every sewer is more or less exposed to intermissions in the flow of
the water that it leads, and the result is a diminution in velocity
which leads to deposits of solid material. Hence the necessity of
regularly flushing the sewer with water, which removes from the sides
the substances that have attached themselves thereto, and which,
without such precaution, soon decompose. In a word, it is necessary
that a _perfect_ washing shall be assured, and this can be done only
by heavy rains or by strong currents of water. As regards rain, that
could not be relied upon; and to have a force of men specially charged
with the service of washing, that would be too costly, and so recourse
has been had to automatic apparatus.

[Illustration: FLUSHING RESERVOIR.]

The automatic siphons used for flushing sewers are characterized in
general by the presence, at the base of the discharge branch, of a
fixed or movable receiving vessel full of water. This vessel has the
inconvenience of breaking the effect of the charge, and the result is
that these apparatus do not render the services that might be expected
from them. Some of these apparatus have valves, floats, chains,
pulleys, and levers. These are still more defective, since their
operation is delicate. The parts of which they are composed easily get
out of order, and then the reservoir does no more flushing at all. A
good automatic flushing reservoir must therefore be of the greatest
simplicity, and its parts must be fixed and strong, and the outflow of
the water must be rapid and energetic and directly from the reservoir
into the sewer. In a word, its construction should be such that there
shall be no need of inspecting it, and that its operation be regular.

The apparatus devised by Mr. E. Putzeys, Director of Works of the city
of Verviers, well fulfills the conditions of an excellent flushing
reservoir with an automatic siphon. The siphon has a double curve, but
may, however, have different forms according to the various uses for
which it may be employed, such as for flushing sewers, urinals,
closets, etc.

The annexed figure represents the apparatus as arranged for flushing a
sewer. The apparatus operates as follows: In the bottom of the branch
of the siphon, S, there is always some water, so that, during the
filling of the reservoir by means of the cock seen in the figure, the
air is compressed in the branch S to a degree that cannot exceed the
pressure of an equal height of water to about double the height of the
siphon. The reservoir therefore can continue to fill without the water
escaping.

The submersion of the small siphon, a, b, c, is less than that of the
principal siphon, S, and it follows that when the level of the
reservoir reaches a height equal to b, a, a new influx, however small
it be, causes the discharge of a few drops of water from the auxiliary
siphon, a, b, c, which is always full of water. At this moment the
water that it contains can no longer resist the thrust of the
compressed air in the branch of the siphon, S, and is therefore
forced, along with the compressed air, into the flushing pipe.

By virtue of the principle of communicating vessels, the water of the
reservoir tends to resume its level in the interior of the apparatus,
and it then enters with such impetuosity that the siphon, whatever be
its dimensions, is primed. The entire reservoir empties
instantaneously, and the water flows to open the sewer.

From the experiments made at Verviers by the inventor, it results
that, with a pipe 10 inches in diameter, the emptying of a 175 cubic
foot reservoir can be effected in 30 seconds.

We may remark that with this apparatus we obtain the maximum of useful
effect, seeing that the work developed is represented by the total
head of the water diminished simply by losses of charge due to
friction in the pipes. In other apparatus the loss of charge is much
less, since the flushing is broken by a receiver.

Putzeys' apparatus, therefore, with a much less discharge of water, is
capable of producing an effect superior to that of similar apparatus.
On account of its simplicity and plain character, there is no need of
precision in the installation of this apparatus, and horizontality,
even, is not a _sine qua non_ for its perfect operation.

The siphon is very easily cleaned, and this is a great advantage,
since it permits of utilizing sewage matter for filling the flushing
reservoir.--_Chronique Industrielle._

       *       *       *       *       *




PEPSIN.

By A. PERCY SMITH, F.I.C., F.C.S., Rugby.


The method usually adopted for estimating the peptonizing power of
pepsina porci consists in dissolving 1 to 2 grains in 8 to 12 ounces
of water, to which 40 to 60 minims of hydrochloric acid has been
added. 500 to 1,000 grains of hard-boiled white of egg, granulated by
rubbing through a wire sieve, is immersed in the liquid, and the whole
kept at 98° to 130° F. for four hours, when the undissolved albumen is
filtered off through muslin, and, after partial drying, is weighed to
ascertain the amount dissolved. The variable numbers above quoted
embrace various formulæ recommended by different experimenters.

This method of analysis is excessively crude and untrustworthy. When
hard-boiled white of egg is kept in warm water, it absorbs a
considerable quantity of that menstruum, as much as several units per
cent.; consequently, on weighing the residual albumen, you may find
that the weight is greater instead of less than that with which you
started, the gain in weight due to absorbed water more than
counterbalancing the loss obtaining through solution, as has happened
with indifferent samples of pepsin. Then who shall say when, by simple
air drying, the albumen has regained its former condition? The
enormous quantity of albumen is foreign to the usual habits of the
scientific analyst, and involves an enormous waste of time in
manipulation.

One trial of this method was enough for me. The first modification I
adopted consisted in substituting for the large quantity of granulated
albumen a single half of the white of an egg in one piece. I likewise
arranged a check experiment in which the pepsin was omitted, other
conditions remaining unaltered. At the end of four hours the residual
pieces of albumen were placed on blotting paper to remove superfluous
moisture, and weighed. The gain in weight of the albumen in the check
experiment, due to absorbed water, was calculated into percentage, and
the same deducted from the weights of the other portions which had
been subjected to the action of various pepsins. This, although an
improvement upon the old method, proved likewise unreliable, because
the water absorbed was not equal in each experiment. The albumen which
was immersed in acidulated water only quickly dried, superficially,
when placed on blotting paper, whereas that which had been acted on by
pepsin was rendered glutinous and incapable of being dried in this
manner. In fact, one sample weighed considerably more than it did at
starting, even after deducting the allowance for water absorbed.

I next tried much smaller pieces of albumen, about 1 c.c., in hope
that complete solution might ensue, and a time value be obtained. I
soon found, however, that the solubility does not depend upon the
mass, but upon the surface exposed.

Finally I discarded altogether the use of fresh white of egg, and had
recourse to dry powdered albumen, prepared by drying in a steam oven
and levigation in a mortar. With this I succeeded in getting accurate
comparisons between the digestive powers of various pepsins. Albumen
in this form dissolves with rapidity, owing to its state of fine
division. Any remaining undissolved can be filtered off on a
counterpoised filter paper, and heated in a water oven until
absolutely dry. It is, however, unnecessary to do this when two
samples only are compared against each other, nor is it essential to
know the actual weight of albumen employed, provided it be the same in
each experiment. This is insured by placing some on the naked pan of
the balance (there is no objection to so doing, as it is a dry gritty
powder, and does not adhere to the metal), and counterpoising by a
similar addition to the other pan.

Let the albumen fall on the center of the filtered liquid, avoiding,
if possible, contact with the glass of the beaker. It soon sinks, and
after the lapse of some time, a simple inspection will show which is
dissolving with the greater rapidity. Agitation assists solution.
Therefore take the two beakers, one in each hand, and rotate the
contents equally. When one sample has dissolved all the albumen, it is
manifestly superior to the other which has failed to do so in the
given time. If many samples have to be compared, it will be necessary
to start with known quantities of albumen, and weigh the undissolved
residues in the manner above indicated.

An objection may possibly be raised to this modified method, viz.,
that albumen as ingested is not in the form of a dry powder, and that
we ought to copy as nearly as possible the conditions existing in the
stomach. To this I would reply that it does not matter in the least,
to us, as analysts, what are the conditions which obtain in the
stomach; since there is no absolute test for pepsin, we can only
compare one sample against another, and that which dissolves the most
albumen in the shortest time is taken to be the best.

Another imperfect method of analysis is that employed in the
examination of malt extracts for diastase, in which a certain weight
of extract ought to dissolve a certain weight of starch in ten
minutes, when if it does so dissolve it, the extract is a good one; if
not, it is to be condemned. The more correct way is to ascertain the
reducing power on Fehling's solution, before and after digestion with
an _excess_ of starch, and I intend to say a few words upon this
subject on a future occasion, when I have ascertained the maximum
amount of diastase existing in the best samples of malt.--_The
Analyst._

       *       *       *       *       *




SUBTERRANEOUS FLORA AND FAUNA.

By Dr. OTTO ZACHARIAS.


It is generally correct to say that air, light and moisture form the
chief conditions necessary for the development of organic plant or
animal life. One of these conditions, however, namely light, is not of
equal importance with the two others. For modern investigation and the
discoveries made during the progress of natural sciences have shown
that in the depths of the ocean, where an everlasting darkness reigns,
and where the temperature is extremely low, nevertheless a great
abundance of animal life is to be found, and that there exist living
beings, not only of the lowest organization, but even fishes and
crustaceans of very complicated structure, all of which thrive without
enjoying the slightest ray of light.

A similar example of animal life in the absence of light is to be
found in the fauna of caves and grottoes. This was first made known to
the world by Austrian and American naturalists. The well known
Adelsberg grotto in Krain, and the gigantic Mammoth Cave in Kentucky,
furnished much interesting material for a detailed study of the
biological conditions of subterraneous animal life. It was gradually
discovered that in those dark places there existed not only insects,
spiders, crustaceans, centipedes, worms, and snails, but also a kind
of salamander and fishes. But what gave special interest to these
discoveries was the fact, ascertained by careful study, that not all
of these beings were gifted with normally developed organs of vision,
but that in some these organs had undergone a retrograde development,
while others were entirely blind.

Among the latter, the blind fish of the Mammoth Cave (_Amblyopsis
spelacus_) is especially remarkable, because in this being the
retrograde development of the organ of vision is accompanied by the
production of certain ridges of skin on the body which are endowed
with an extreme sensitiveness of touch, and which, according to a work
lately published by Professor Von Leydig, are composed of little warts
in which the nerve fibers end. Nature, therefore, has in this case
compensated the amblyopsis for his loss of sight by endowing him with
a highly developed organ of feeling.

A similar phenomenon is to be observed in the blind crab (_Cambaras
pellucidus_), which is also found in the Mammoth Cave, for in this
being, according to Professor Von Leydig, the little warts on the
interior feelers, which constitute the organ of smell, have also
received an abnormal development.

[Illustration: FIG. 1.--THE SEMI-BLIND SALAMANDER (PROTEUS ANGUINEUS)
               OF THE ADELSBERG GROTTO, IN AUSTRIA.]

Better known than the blind fish and the blind crab of Kentucky is the
_Proteus anguineus_, a kind of salamander, of a pale rose color,
endowed with gills and found in the Adelsberg grotto in Austria. (Fig.
1.)

This amphibium has an eye which lies very deep in the body and is
almost overgrown by the skin. But this eye is by no means as developed
as the organ of vision, for instance, of the water salamander (the
triton) or of the so-called axolotl, for it exists only in a kind of
embryonic development, and contains neither a vitreous humor nor a
lens for the refraction of the rays of light. As, however, the nerve
of vision exists, it is possible that this salamander may be able to
discern in some manner between light and darkness.

The thinking student, when discovering such imperfect organs of sight,
will naturally ask how the eye of this salamander, which is so useless
for its real purpose, has come into existence, and he will weigh the
comparative value of the two following explanations. It may be assumed
that there existed once in the Adelsberg grotto a salamander which was
absolutely blind, and in which, in consequence of an innate power of
evolution, an organ of vision of the lowest kind was gradually formed.
But to this assumption the objection may be raised at once, why nature
should have produced an organ of vision in an animal living in a
grotto, where such an organ is absolutely useless, and where such a
development would be quite as paradoxical and improbable as, for
instance, the development of fins instead of legs in an animal living
on dry land.

On the other hand, one may suppose, and this is the more probable
explanation, that the _Proteus anguineus_ is descended from a kind of
salamander, which possessed perfectly developed eyes in the beginning,
and that the imperfect organ of vision in the descendants living in
the dark caves is the result of gradual degeneration. This is the more
likely to be true as in many other cases, also, we find that organs
which become useless and cannot be employed have gradually
degenerated.

Our common mole furnishes an example. Its eyes also have become small
and are deeply hidden in the muscles, although they are by no means as
much degenerated as in the _Proteus anguineus_, and are still
possessed of a lens and a retina. Their nerve of vision, however, has
become very imperfect, and its connection with the brain is
interrupted, so that the animal for this reason can have no perception
of light. Notwithstanding the above, however, it is doubtful whether
the degeneration and gradual disappearance of the visual organ is in
all cases the result of their being no longer employed, since there
exists in dark caves a kind of beetle, the _Machaerites_, in which
species the female only is blind, while the male has a well developed
organ of sight. In this case it cannot be maintained that the absence
of light has been the cause of the blindness of the female beetle,
because it would have acted equally upon the male. Nevertheless, no
other explanation can be found for the blindness. The problem,
therefore, is hitherto unsolved.

Of late the investigations of naturalists have been extended to the
animal life existing not only in grottoes and caves, but also in mines
and pits created by the action of man, and this has led to many
interesting discoveries and remarkable results. A naturalist who has
especially enlarged our knowledge with regard to the subterraneous
fauna and flora is Dr. Robert Schneider, of Berlin, who made his
studies in the coal mines near Waldenburg and Altwasser, in Silesia,
the salt mines of Stassfurt and the metal mines of Klausthal, in the
Upper Harz Mountains.

[Illustration: FIG. 2.--GROUP OF PYRENOMYCETES, A SPECIES OF FUNGI
               FREQUENT IN THE WATERS OF MINES.

   a. Found in the mines of Waldenburg; b. In the brown-coal pits
   near Westeregeln; c. In the Dorothea pit at Klausthal.]

[Illustration: FIG. 3.

   a. Rhizomorpha canalicularis of Hoffmann, b. Club fungus
   (Clavaria deflexa) of Hoffmann, found in the mines at Klausthal.]

As regards the subterraneous flora, Dr. Schneider's investigations
resulted in showing that the plants which thrive in the dark regions
under ground are those which possess no chlorophyl and are sensitive
to light. Those which vegetate most luxuriantly there are the _fungi_,
and among them especially the _pyrenomycetes_, which are frequent in
the waters of mines. Their general aspect is shown in a 480 times
magnified form in Fig. 2. They resemble fine threads of delicate
structure, and where found are always discovered in great abundance.
Most conspicuous by their shape and considerable size are the
_rhizomorphæ_, Fig. 3a, and they are remarkable, not only for their
brilliant phosphorescence, but also for the peculiar fact that they
are only found in places where light does not enter. These
_rhizomorphæ_, though this is not easily recognizable from their
external appearance, also belong to the fungi and are often seen in
strings of the length of over a meter and the thickness of a quill,
spreading out in peculiar branches and hanging down from moist beams
in dark places. Sometimes they grow like seaweed in the water of the
mines, and in this case they give much embarrassment to the miners,
because they are apt to obstruct the channels constructed for leading
off the superfluous water. In the mines of Freiberg these
_rhizomorphæ_ exist in great abundance, and Humboldt already mentions
specimens of the length of 4½ feet. Miners in Germany call them
_zwirn_ (thread). The student of natural sciences, when encountering
these peculiar forms of vegetation, will ask in how far they are the
product of their surrounding circumstances (i.e., of the absence of
light or the presence of moisture), and in order to find a reply to
this question experiments have been made to grow these _rhizomorphæ_
under different conditions of existence. These experiments have shown
that from several species of _rhizomorphæ_ other ordinary fungi can be
developed, and that the subterraneous specimens therefore may be
considered a degeneration and variation of the fungi found above the
surface of the ground.

[Illustration: FIG. 4.

   a. Agaricus myurus of Hoffmann, a subterranean fungus. b.
   Himantia villosa, a species of rhizomorpha found in the Upper
   Harz Mountains.]

In Fig. 4b the _Himantia villosa_ is represented, a rhizomorpha found
in the mines of the Upper Harz Mountains, thus showing another form of
this vegetable growth. Though it is difficult, as above stated, to
recognize by their shape the rhizormorphæ as fungi, the origin of the
peculiar _Agaricus myurus_ of Hoffmann (Fig. 4a) will be much easier
discovered, though a retrograde development and degeneration has taken
place also in this fungus. It still shows, however, the elements of a
regular toadstool, only that the stem is much elongated and looks like
a thread or a tube, while the cap is small, and this explains how, by
gradual degeneration, the cap may disappear entirely, leaving nothing
but a stem, as, for instance, in the case of the _Clavaria deflexa_,
the club fungus, shown in Fig. 3b.

In connection with the above it may be well to speak of the fungi
constituting the mould which often covers the roof and the doors in
the brown-coal mines of Halle, specimens of which are shown in Fig. 5.

[Illustration: FIG. 5.--FORMS OF MOULD FUNGI FOUND IN THE BROWN-COAL
               MINES NEAR HALLE A. S.]

We now come to the animal life in mines and pits. This is mostly
represented, of course, by lower organisms, as infusoria and worms.
Thus, in the slime on the bottom of the waters in mines, several
species of _amoebæ_ are found, which consist of microscopically
small animated bodies, continually floating about, nourishing
themselves by absorbing organic matter, possessing sensation,
propagating, etc., and, in fact, having actually the qualities of real
animal nature. Further, we find in those subterraneous waters a
species of the sun infusorium (_Actinophrys_), which is especially
frequent in the mines of Klausthal. Fig. 6 shows one of these
peculiar little beings. Also the _Stylonychia_ (Fig. 7) is a
characteristic inhabitant of those places, and always present there.

[Illustration: FIG. 6.--THE SUN INFUSORIUM (ACTINOPHRYS).]

[Illustration: FIG. 7.--THE RAPACIOUS INFUSORIUM (STYLONYCHIA).]

It moves with great rapidity in the water by means of the numerous
hairs covering its body, can turn quickly in any direction, and thus
is enabled to catch suddenly the little beings on which it lives and
which it hunts; for which reason the stylonychia is called the
"rapacious infusorium."

The above are organisms which can be seen only through the microscope,
but the fauna of mines contains also larger organisms, though they are
not found as regularly and are not as characteristic for those places
as the forms mentioned hitherto. Among these organisms there are
several species of worms, spiders, gnats, and, above all, crustaceans
of the lower class. The most interesting of the latter is perhaps a
variety of the sand flea (Fig. 8--_Gammarus pulex_). The crustacean
found in the pits of mines, which is related to the sand flea, shows,
according to Dr. R. Schneider, a slight degeneration of the organ of
sight, which has taken place in consequence of its adaptation to the
dark places, in which this variety of the _Gammarus pulex_ is found,
which can make no use of eyes, while the sand flea possesses them
fully developed. Otherwise, however, the two varieties are almost
absolutely alike, differing only in some details.

[Illustration: FIG. 8.--THE SAND FLEA (GAMMARUS PULEX).]

From the above the reader will see that "breathing in the rosy light,"
as Schiller calls it, is not an absolutely necessary condition for the
existence of organic beings, but that life exists everywhere, where
there is air and moisture, and a temperature which is not always below
freezing point, though even eternal frost does not exclude life
entirely, as is proved by the existence of the glacier flea, showing
that even in the icy coverings of the Alps life still is possible.
Mephistopheles may therefore well say:

  "From water, earth, and air unfolding,
A thousand germs break forth and grow
  In dry and wet, and warm and chilly;
  And had I not the Flame reserved, why really,
There's nothing special of my own to show!"

--_Leipziger Illustrirte Zeitung._

       *       *       *       *       *

[NATURE.]




TIMBER, AND SOME OF ITS DISEASES.[1]

   [Footnote 1: Continued from Supplement, No. 661, page 10558.]

By H. MARSHALL WARD.


IX.

In the months of April and May, the younger needle-like leaves of the
Scotch pine are occasionally seen to have assumed a yellow tinge, and
on closer examination this change in color, from green to yellow, is
seen to be due to the development of what look like small orange
colored vesicles standing off from the surface of the epidermis, and
which have in fact burst through from the interior of the leaf (Fig.
31). Between these larger orange yellow vesicles the lens shows
certain smaller brownish or almost black specks. Each of the vesicular
swellings is a form of fungus fructification known as an _Æcidium_,
and each of the smaller specks is a fungus structure called a
_Spermogonium_, and both of these bodies are developed from a mycelium
in the tissues of the leaf. I must employ these technical terms, but
will explain them more in detail shortly: the point to be attended to
for the moment is that this fungus in the leaf has long been known
under the name of _Peridermium Pini_ (var. _acicola_, i.e., the
variety which lives upon the needle-like leaves).


[Illustration: FIG. 31.--To the right is a pair of leaves of the
   Scotch pine, with the blister-like Æcidia a. of Peridermium Pini
   (var. acicola) projecting from their tissues: these blisters are
   orange yellow in color, and contain spores, as shown in Fig. 33.
   Between the blisters are the minute spermogonia, b. To the left
   is a small branch, killed at a a a by Peridermium Pini (var.
   corticola), the blister-like yellow Æcidia of the fungus being
   very conspicuous. (Reduced, after Hartig.)]

On the younger branches of the Scotch pine, the Weymouth pine, the
Austrian pine, and some others, there may also be seen in May and June
similar but larger bladder-like orange vesicles (_Æcidia_) bursting
through the cortex (Fig. 31); and here, again, careful examination
shows the darker smaller _Spermogonia_ in patches between the
_Æcidia_. These also arise from a fungus mycelium in the tissues of
the cortex, whence the fungus was named _Peridermium Pini_ (var.
_corticola_). It is thus seen that the fungus _Peridermium Pini_ was
regarded as a parasite of pines, and that it possessed two varieties,
one inhabiting the leaves and the other the cortex: the "varieties"
were so considered, because certain trivial differences were found in
the minute structure of the _Æcidia_ and _Spermogonia_.

[Illustration: FIG. 32.--Blisters (Æcidia) of Peridermium Pini (var.
   corticola) on a branch of the Scotch pine: some of the Æcidia
   have already burst at the apex and scattered their spores, b, b;
   the others are still intact. (Natural size, after Hess).]

If we cut thin vertical sections through a leaf and one of the
smallest _Æcidia_, and examine the latter with the microscope, it will
be found to consist of a mass of spores arranged in vertical rows,
each row springing from a branch of the mycelium: the outermost of
these spores--i.e., those which form a compact layer close beneath the
epidermis--remain barren, and serve as a kind of membrane covering the
rest (Fig. 33, p). It is this membrane which protrudes like a blister
from the tissues. The hyphæ of the fungus are seen running in all
directions between the cells of the leaf tissue, and as they rise up
and form the vertical chains of spores, the pressure gradually forces
up the epidermis of the leaf, bursts it, and the mass of orange yellow
powdery spores protrude to the exterior enveloped in the aforesaid
membrane of contiguous barren spores. If we examine older _Æcidia_, it
will be found that this membrane bursts also at length, and the spores
escape.

Similar sections across a _Spermogonium_ exhibit a structure which
differs slightly from the above. Here also the hyphæ in the leaf turn
upward, and send delicate branches in a converging crowd beneath the
epidermis; the latter gives way beneath the pressure, and the free
tips of the hyphæ constrict off very minute spore-like bodies. These
minute bodies are termed _Spermatia_, and I shall say no more about
them after remarking that they are quite barren, and that similar
sterile bodies are known to occur in very many of the fungi belonging
to this and other groups.

Sections through the _Æcidia_ and _Spermogonia_ on the cortex present
structures so similar, except in minute details which could only be
explained by lengthy descriptions and many illustrations, that I shall
not dwell upon them; simply reminding the reader that the resemblances
are so striking that systematic mycologists have long referred them to
a mere variety of the same fungus.

Now as to the kind and amount of damage caused by the ravages of these
two forms of fungus.

In the leaves, the mycelium is found running between the cells (Fig.
33, h), and absorbing or destroying their contents: since the leaves
do not fail the first season, and the mycelium remains living in their
tissues well into the second year, it is generally accepted that it
does very little harm. At the same time, it is evident that, if very
many leaves are being thus taxed by the fungus, they cannot be
supplying the tree with food materials in such quantities as if the
leaves were intact. However, the fungus is remarkable in this
respect--that it lives and grows for a year or two in the leaves, and
does not (as so many of its allies do) kill them after a few weeks. It
is also stated that only young pines are badly attacked by this form:
it is rare to find _Æcidia_ on trees more than twenty years or so old.

[Illustration: FIG. 33.--Vertical section through a very young Æcidium
   of Peridermium Pini (var. acicola), with part of the subjacent
   tissue of the leaf, h, the mycelium of the parasitic fungus
   running between the cells of the leaf; immediately beneath the
   epidermis of the leaf, the ends of the hyphæ give rise to the
   vertical rows of spores (b), the outermost of which (p) remain
   barren, and form the membrane of the blister-like body. The
   epidermis is already ruptured at p by the pressure of the young
   Æcidium. (After K. Hartig: highly magnified.)]

Much more disastrous results can be traced directly to the action of
the mycelium in the cortex. The hyphæ grow and branch between the
green cells of the true cortex, as well as in the vast tissues
beneath, and even make their way into the medullary rays and resin
canals in the wood, though not very deep. Short branches of the hyphæ
pierce the cells, and consume their starch and other contents, causing
a large outflow of resin, which soaks into the wood or exudes from the
bark. It is probable that this effusion of turpentine into the tissues
of the wood, cambium, and cortex has much to do with the drying up of
the parts above the attacked portion of the stem: the tissues shrivel
up and die, the turpentine in the canals slowly sinking down into the
injured region. The drying up would of course occur if the conducting
portions are steeped in turpentine, preventing the conduction of water
from below.

The mycelium lives for years in the cortex, and may be found killing
the young tissues just formed from the cambium during the early
summer: of course the annual ring of wood, etc., is here impoverished.
If the mycelium is confined to one side of the stem, a flat or
depressed spreading wound arises; if this extends all round, the parts
above must die.

When fairly thick stems or branches have the mycelium on one side
only, the cambium is injured locally, and the thickening is of course
partial. The annual rings are formed as usual on the opposite side of
the stem, where the cambium is still intact, or they are even thicker
than usual, because the cambium there diverts to itself more than the
usual share of food substances; where the mycelium exists, however,
the cambium is destroyed, and no thickening layer is formed. From this
cause arise cancerous malformations which are very common in pine
woods (Fig. 34).

[Illustration: FIG. 34.--Section across an old pine stem in the
   cancerous region injured by Peridermium Pini (var. corticola). As
   shown by the figures, the stem was fifteen years old when the
   ravages of the fungus began to affect the cambium near a. The
   mycelium, spreading in the cortex and cambium on all sides,
   gradually restricted the action of the latter more and more; at
   thirty years old, the still sound cambium only extended half way
   round the stem--no wood being developed on the opposite side. By
   the time the tree was eighty years old, only the small area of
   cambium indicated by the thin line marked 80 was still alive; and
   soon afterward the stem was completely "ringed," and dead, all
   the tissues being suffused with resin. (After Hartig.)]

Putting everything together, it is not difficult to explain the
symptoms of the disease. The struggle between the mycelium on the one
hand, which tries to extend all round in the cortex, and the tree
itself, on the other, as it tries to repair the mischief, will end in
the triumph of the fungus as soon as its ravages extend so far as to
cut off the water supply to the parts above: this will occur as soon
as the mycelium extends all round the cortex, or even sooner if the
effusion of turpentine hastens the blocking up of the channels. This
may take many years to accomplish.

So far, and taking into account the enormous spread of this disastrous
disease, the obvious remedial measures seem to be, to cut down the
diseased trees--of course this should be done in the winter, or at
least before the spores come--and use the timber as best may be; but
we must first see whether such a suggestion needs modifying, after
learning more about the fungus and its habits. It appears clear, at
any rate, however, that every diseased tree removed means a source of
Æcidiospores the less. Probably every one knows the common groundsel,
which abounds all over Britain and the Continent, and no doubt many of
my readers are acquainted with other species of the same genus
(_Senecio_) to which the groundsel belongs, and especially with the
ragwort (_Senecio Jacobæa_). It has long been known that the leaves of
these plants, and of several allied species, are attacked by a fungus,
the mycelium of which spreads in the leaf passages, and gives rise to
powdery masses of orange yellow spores, arranged in vertical rows
beneath the stomata: these powdery masses of spores burst forth
through the epidermis, but are not clothed by any covering, such as
the _Æcidia_ of _Peridermium Pini_, for instance. These groups of
yellow spores burst forth in irregular powdery patches, scattered over
the under sides of the leaves in July and August: toward the end of
the summer a slightly different form of spore, but similarly arranged,
springs from the same mycelium on the same patches. From the
differences in their form, time of appearance, and (as we shall see)
functions, these two kinds of spores have received different names.
Those first produced have numerous papillæ on them, and were called
_Uredospores_, from their analogies with the uredospore of the rust of
wheat; the second kind of spore is smooth, and is called the
_Teleutospore_, also from analogies with the spores produced in the
late summer by the wheat rust. The fungus which produces these
uredospores and teleutospores was named and has been long
distinguished as _Coleosporium Senecionis_ (Pers.) We are not
immediately interested in the damage done by this parasite to the
weeds which it infests, and at any rate we might well be tempted to
rejoice in its destructive action on these garden pests. It is
sufficient to point out that the influence of the mycelium is to
shorten the lives of the leaves, and to rob the plant of food material
in the way referred to generally in my last article.

What we are here more directly interested in is the following. A few
years ago Wolff showed that if the spores from the _Æcidia Peridermium
Pini_ (var. _acicola_) are sown on the leaf of _Senecio_, the germinal
hyphæ which grow out from the spores _enter the stomata of the
Senecio leaf, and there develop into the fungus called Coleosporium
Senecionis_. In other words, the fungus growing in the cortex of the
pine, and that parasitic on the leaves of the groundsel and its
allies, are one and the same: it spends part of its life on the tree
and the other part on the herb.

[Illustration: FIG. 35. A spore of Peridermium Pini germinating. It
   puts forth the long, branched germinal hyphæ on the damp surface
   of a leaf of Senecio, and one of the branches enters a stoma, and
   forms a mycelium in the leaf: after some time, the mycelium gives
   rise to the uredospores and teleutospores of Coleosporium
   Senecionis. (After Tulasne: highly magnified.)]

If I left the matter stated only in this bald manner, it is probable
that few of my readers would believe the wonder. But, as a matter of
fact, this phenomenon, on the one hand, is by no means a solitary
instance, for we know many of these fungi which require two host
plants in order to complete their life history; and, on the other
hand, several observers of the highest rank have repeated Wolff's
experiment and found his results correct. Hartig, for instance, to
whose indefatigable and ingenious researches we owe most that is known
of the disease caused by the _Peridermium_, has confirmed Wolff's
results.

It was to the brilliant researches of the late Prof. De Bary that we
owe the first recognition of this remarkable phenomenon of
_heteroecism_--i.e., the inhabiting more than one host--of the
fungi. De Bary proved that the old idea of the farmer, that the rust
is very apt to appear on wheat growing in the neighborhood of berberry
bushes, was no fable; but on the contrary, that the yellow _Æcidium_
on the berberry is a phase in the life history of the fungus causing
the wheat rust. Many other cases are now known, e.g.., the _Æcidium
abietinum_, on the spruce firs in the Alps, passes the other part of
its life on the rhododendrons of the same region. Another well known
example is that of the fungus _Gymnosporangium_, which injures the
wood of junipers. Oersted first proved that the other part of its life
is spent on the leaves of certain Rosaceæ, and his discovery has been
repeatedly confirmed. I have myself observed the following
confirmation of this. The stems of the junipers so common in the
neighborhood of Silverdale (near Morecambe Bay) used to be distorted
with _Gymnosporangium_, and covered with the _teleutospores_ of this
fungus every spring: in July all the hawthorn hedges in the
neighborhood had their leaves covered with the Æcidium form (formerly
called Roestelia), and it was quite easy to show that the fungus on
the hawthorn leaves was produced by sowing the _Gymnosporangium_
spores on them. Many other well established cases of similar
heteroecism could be quoted.

But we must return to the _Peridermium Pini_. It will be remembered
that I expressed myself somewhat cautiously regarding the
_Peridermium_ on the leaves (var. _acicola_). It appears that there is
need for further investigations into the life history of this form,
for it has been thought more than probable that it is not a mere
variety of the other, but a totally different species.

Only so lately as 1883, however, Wolff succeeded in infecting the
leaves of _Senecio_ with the spores of _Peridermium Pini_ (_acicola_),
and developing the _Coleosporium_, thus showing that both the
varieties belong to the same fungus.

It will be seen from the foregoing that in the study of the biological
relationships between any one plant which we happen to value because
it produces timber and any other which grows in the neighborhood there
may be (and there usually is) a series of problems fraught with
interest so deep scientifically, and so important economically, that
one would suppose no efforts would be spared to investigate them: no
doubt it will be seen as time progresses that what occasionally looks
like apathy with regard to these matters is in reality only apparent
indifference due to want of information.

Returning once more to the particular case in question, it is obvious
that our new knowledge points to the desirability of keeping the seed
beds and nurseries especially clean from groundsel and weeds of that
description: on the one hand, such weeds are noxious in themselves,
and on the other they harbor the _Coleosporium_ form of the fungus
_Peridermium_ under the best conditions for infection. It may be added
that it is known that the fungus can go on being reproduced by the
_uredospores_ on the groundsel plants which live through the winter.

       *       *       *       *       *


In St. Genevieve and Cape Girardeau Counties, Mo., in the Niagara
limestone is found a handsome marble of a variegated liver color. Near
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various shades of flesh, yellow, green, pink, purple, and chocolate,
all handsomely blended.

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Transcriber's Note

In the original publication the author of 'Coal Tar as Fuel for Steam
Boilers' is described as John McCrae in the Contents and John M'Crae
in the article header. The second was considered an error and
corrected.







*** END OF THE PROJECT GUTENBERG EBOOK SCIENTIFIC AMERICAN SUPPLEMENT, NO. 664, SEPTEMBER 22,1888 ***


    

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