Scientific American Supplement, No. 303
by
Various
Part 1 out of 3
Olaf Voss, Don Kretz, Juliet Sutherland, Charles Franks
and the Online Distributed Proofreading Team.
[Illustration]
SCIENTIFIC AMERICAN SUPPLEMENT NO. 303
NEW YORK, OCTOBER 22, 1881
Scientific American Supplement. Vol. XII, No. 303.
Scientific American established 1845
Scientific American Supplement, $5 a year.
Scientific American and Supplement, $7 a year.
* * * * *
TABLE OF CONTENTS
I. ENGINEERING AND MECHANICS.--New Eighty-ton Steam Hammer at the Saint
Chamond Works, France.--7 figures.--Elevation of hammer.--Profile--
Transverse section.--Profile view of foundation, etc.--Plan of
plant.--General plan of the forging mill.--Details of truss and
support for the cranes.
Great Steamers.--Comparative details of the Servia, the City of Rome,
the Alaska, and the Great Eastern.
Improved Road Locomotive.--2 figures.--Side and end views
American Milling Methods. By ALBERT HOPPIN.--Ten years' progress.--Low
milling.--Half high milling.--High milling.--Important paper read
before the Pennsylvania State Millers' Association.
Machine for Dotting Tulles and other Light Fabrics.--3 figures.
II. TECHNOLOGY AND CHEMISTRY.--The Reproduction and Multiplication of
Negatives. By ERNEST EDWARDS.
A New Method of Making Gelatine Emulsion. By W. K. BURTON.
The Pottery and Porcelain Industries of Japan.
Crystallization Table.
The Principles of Hop Analysis. By Dr. G. O. CECH.
Water Gas.--A description of apparatus for producing cheap gas, and
some notes on the economical effects of using such gas with gas
motors, etc.--By J. EMERSON DOWSON.
On the Fluid Density of Certain Metals. By Professors CHANDLER ROBERTS
and T. WRIGLESON.
III. PHYSICS, ELECTRICITY, ETC.--Electric Power.--The nature and uses of
electricity.--Electricity vs. steam.
On the Method of Obtaining and Measuring Very High Vacua with a
Modified Form of Sprengel Pump. By Prof OGDEN N. ROOD.--4 figures.--
Apparatus for obtaining vacua of one four hundred-millionth of an
atmosphere--Construction.--Manipulation.--Calculations.--Results
IV. ART, ARCHITECTURE, ETC.--Old Wrought Iron Gates, Guildhall.
Worcester, England. 1 figure.
The French Crystal Palace, Park of St. Cloud, Paris. 1 full page
illustration.
Suggestions in Architecture. A Castellated Chateau. Perspective and
plan. Chateau in the AEgean Sea.
V. HYGIENE AND MEDICINE.--Hydrophobia Prevented by Vaccination.
On Diptera as Spreaders of Disease. By J. W. SLATER.
On the Relations of Minute Organisms to Certain Specific Diseases.
VI. ASTRONOMY--The Centenary of the Discovery of Uranus. By F. W. DENNING.
2 figures. Approximate place of Uranus among the stars at its
discovery, March l3, 1871.--Orbits of the Uranian Satellites.
VII. BIOLOGY, ETC.--The Varying Susceptibility of Plants and Animals to
Poisons and Disease.
Kind Treatment of Horses.
* * * * *
NEW EIGHTY TON STEAM HAMMER AT THE SAINT CHAMOND WORKS
Ever since the improvements that have been introduced into the
manufacture of steel, and especially into the erection of works for its
production, have made it possible to obtain this metal in very large
masses, it has necessarily been preferred to iron for all pieces of
large dimensions, inasmuch as it possesses in the highest degree that
homogeneousness and resistance which are so difficult to obtain in the
latter metal. It has consequently been found necessary to construct
engines sufficiently powerful to effect the forging of enormous
ingots, as well as special furnaces for heating them and apparatus for
manipulating and transporting them.
The greatest efforts in this direction have been made with a view to
supplying the wants of heavy artillery and of naval constructions;
and to these efforts is metallurgy indebted for the creation of
establishments on a scale that no one would have dared a few years ago
to think of. The forging mill which we are about to describe is one of
those creations which is destined to remain for a long time yet very
rare; and one which is fully able to respond, not only to all present
exigencies, but also, as far as can be foreseen, to all those that may
arise for a long period to come. The mill is constructed as a portion of
the vast works that the Compagnie des Forges et Acieries de la Marine
own at Saint Chamond, and which embrace likewise a powerful steel works
that furnishes, especially, large ingots exceeding 100 tons in weight.
The mill consists, altogether, of three hammers, located in the same
room, and being of unequal powers in order to respond to different
requirements. The largest of these hammers is of 80 tons weight, and
the other two weigh respectively 35 and 28 tons. Each of them has
a corresponding furnace for heating by gas, as well as cranes for
maneuvering the ingots and the different engines. The general plan view
in Fig. 4 shows the arrangement of the hammers, cranes, and furnaces in
the millhouse.
[Illustration: FIG. A.--ELEVATION OF A HAMMER. FIG. B.--PROFILE VIEW]
The gas generators which supply the gas-furnaces are located out of
doors, as are the steam-generators. The ingots are brought from the
steel factory, and the forged pieces are taken away, by special trucks
running on a system of rails. We shall now give the most important
details in regard to the different parts of the works.
_The Mill-House_--This consists of a central room, 262 feet long, 98
feet wide, and 68 feet in height, with two lean-to annexes of 16 feet
each, making the total width 100 feet. The structure is wholly of metal,
and is so arranged as to permit of advantage being taken of every foot
of space under cover. For this purpose the system of construction
without tie-beams, known as the "De Dion type," has been adopted. Fig.
1 gives a general view of one of the trusses, and Fig. 5 shows some
further details. The binding-rafters consist of four angle-irons
connected by cross-bars of flat iron. The covering of corrugated
galvanized iron rests directly upon the binding-rafters, the upper parts
of which are covered with wood for the attachment of the corrugated
metal. The spacing of these rafters is calculated according to the
length of the sheets of corrugated iron, thus dispensing with the use of
ordinary rafters, and making a roof which is at once very light and very
durable, and consequently very economical. Rain falling on the roof
flows into leaden gutters, from whence it is carried by leaders into a
subterranean drain. The vertical walls of the structure are likewise of
corrugated iron, and the general aspect of the building is very original
and very satisfactory.
_The 80 Ton Hammer_--The three hammers, notwithstanding their difference
in power, present similar arrangements, and scarcely vary except in
dimensions. We shall confine ourselves here to a description of the 80
ton apparatus. This consists, in addition to the hammer, properly so
called, of three cranes of 120 tons each, serving to maneuver the pieces
to be forged, and of a fourth of 75 tons for maneuvering the working
implements. These four cranes are arranged symmetrically around the
hammer, and are supported at their upper extremity by metallic stays.
Besides the foregoing there are three gas furnaces for heating the
ingots. Figs. 1, 2, and 3 show the general arrangement of the apparatus.
_Foundations of the Hammer and Composition of the Anvil-Bed_--To obtain
a foundation for the hammer an excavation was made to a depth of 26 feet
until a bed of solid rock was reached, and upon this there was then
spread a thick layer of beton, and upon this again there was placed a
bed of dressed stones in the part that was to receive the anvil-stock
and hammer.
On this base of dressed stones there was placed a bed formed of logs
of heartwood of oak squaring 16 inches by 3 feet in height, standing
upright, joined together very perfectly, and kept in close juxtaposition
by a double band of iron straps joined by bolts. The object of this
wooden bed was to deaden, in a great measure, the effect of the shock
transmitted by the anvil-stock.
NEW EIGHTY-TON STEAM HAMMER AT THE ST CHAMOND WORKS.
[Illustration: FIG. 1.--TRANSVERSE SECTION.]
[Illustration: FIG. 2.--PLAN.]
[Illustration: FIG. 3.--PROFILE VIEW.]
[Illustration: FIG. 4.--GENERAL PLAN OF THE FORGING MILL.]
[Illustration: FIG. 5.--DETAILS OF THE TRUSSAND SUPPORT FOR THE CRANE.]
_The Anvil-Stock_.--The anvil-stock, which is pyramidal in shape, and
the total weight of which amounts to 500 tons, is composed of superposed
courses, each formed of one or two blocks of cast iron. Each course
and every contact was very carefully planed in order to make sure of
a perfect fitting of the parts; and all the different blocks were
connected by means of mortises, by hot bandaging, and by joints with
key-pieces, in such a way as to effect a perfect solidity of the parts
and to make the whole compact and impossible to get out of shape.
The anvil-stock was afterwards surrounded by a filling-in of masonry
composed of rag-stones and a mortar made of cement and hydraulic lime.
This masonry also forms the foundation for the standards of the hammer,
and is capped with dressed stone to receive the bed-plates.
_The Power-Hammer_ (Figs. A and B).--The power-hammer, properly
so-called, consists, in addition to the hammer-head, of two standards to
whose inner sides are bolted guides upon which slides the moving mass.
The bed-plates of cast iron are 28 inches thick, and are independent of
the anvil-stock. They are set into the bed of dressed stone capping the
foundation, and are connected together by bars of iron and affixed to
the masonry by foundation bolts. To these bedplates are affixed the
standards by means of bolts and keys. The two standards are connected
together by iron plates four inches in thickness, which are set into the
metal and bolted to it so as to secure the utmost strength and solidity.
The platform which connects the upper extremities of the standards
supports the steam cylinder and the apparatus for distributing the
steam. The latter consists of a throttle valve, twelve inches in
diameter, and an eduction valve eighteen inches in diameter, the
maneuvering of which is done by means of rods extending down to a
platform upon which the engineman stands. This platform is so situated
that all orders can be distinctly heard by the engineman, and so that
he shall be protected from the heat radiated by the steel that is
being forged. All the maneuvers of the hammers are effected with most
wonderful facility and with the greatest precision.
The piston is of cast-steel, and the rod is of iron, 12 inches in
diameter. The waste steam is carried out of the mill by a pipe, and,
before being allowed to escape into the atmosphere, is directed into an
expansion pipe which it penetrates from bottom to top. Here a portion of
the water condenses and flows off, and the steam then escapes into
the open air with a greatly diminished pressure. The object of this
arrangement is to diminish to a considerable extent the shocks and
disagreeable noise that would be produced by the direct escape of the
steam at quite a high pressure and also to avoid the fall of condensed
water.
The following are a few details regarding the construction of the
hammer:
Total height of foundations........... 26 ft.
From the ground to the platform ...... 28 "
Platform .............................. 3.25 "
Height of cylinder.................... 21 "
________
Total height...................... 78.25 ft.
Weight of anvil-stock................ 500 tons.
Weight of bed-plates................. 122 "
Weight of standards.................. 270 "
Weight of platform and cylinder...... 148 "
Piston, valves, engineman's platform,
hammer, etc........................ 160 "
__________
Total weight................... 1,200 tons.
Weight of the hammer.................. 80 tons.
Maximum fall.......................... 25.75 ft.
Distance apart of the standards....... 21.6 "
Width of hammer....................... 6 "
Pressure of steam..................... 16 lb.
Effective pressure to lift 80 tons.... 7 "
_Description of Figures_.--A, the 80-ton hammer; B, B1, B2, cranes; C,
C1, C2, supports of cranes; D, D1, D2, gas furnaces; A1, the 35-ton
hammer; A2, the 28-ton hammer; EE, railways; F, engineman's platform; G,
lever for maneuvering the throttle valve; H, an ingot being forged.
* * * * *
GREAT STEAMERS.
The _Brooklyn Eagle_ gives a very interesting description of the three
new steamships now almost completed and shortly to be placed in the New
York and Liverpool trade by the Cunard, Inman, and Williams and Guion
lines. The writer has prepared a table comparing the three vessels
with each other and with the Great Eastern, the only ship of greater
dimensions ever built. We give as much of the article as our space will
allow, and regret that we have not the room to give it entire:
Line. Cunard. Inman. Guion. Admiralty.
Vessel. Servia City of Rome. Alaska. Great[1]
Length 530 feet. 546 feet. 520 feet. 679 feet.
Breadth 52 feet. 52 ft. 3 in. 50 ft. 6 in. 82 feet.
Depth 44 ft. 9 in. 37 feet. 38 feet. 60 feet.
Gross ton'ge 8,500 8,300 8,000 13,344[2]
Horse pow'r 10,500 10,000 11,000 2,600
Speed 171/2 knots. 18 knots. 18 knots. 14 knots.
Sal'n pas- 320 and 52
sengers. 450 300 2d class
Steerage 600 1,500 1,000
Where Clydeb'nk Barrow in Clyde,
built. Thomson Furness Elder
Date of
sailing. October 22 October 13 November 5
[Footnote 1: To be sold at auction soon.]
[Footnote 2: Net register.]
In 1870 the total tonnage of British steam shipping was 1,111,375; the
returns for the year 1876 showed an increase to 2,150,302 tons, and from
that time to the present it has been increasing still more rapidly. But,
as can be seen from the above table, not only has the total tonnage
increased to this enormous extent, but an immense advance has been made
in increasing the size of vessels. The reason for this is, that it has
been found that where speed is required, along with large cargo and
passenger accommodation, a vessel of large dimensions is necessary, and
will give what is required with the least proportionate first cost as
well as working cost. Up to the present time the Inman line possessed,
in the City of Berlin, of 5,491 tons, the vessel of largest tonnage in
existence. Now, however, the Berlin is surpassed by the City of Rome by
nearly 3,000 tons, and the latter is less, by 200 tons, than the Servia,
of the Cunard line. It will be observed, too, that while there is not
much difference between the three vessels in point of length, the depth
of the Alaska and the City of Rome, respectively, is only 38 feet and 37
feet, that of the Servia is nearly 45 feet as compared with that of the
Great Eastern of 60 feet. This makes the Servia, proportionately, the
deepest ship of all. All three vessels are built of steel. This metal
was chosen not only because of its greater strength as against iron,
but also because it is more ductile and the advantage of less weight is
gained, as will be seen when it is mentioned that the Servia, if built
of iron, would have weighed 620 tons more than she does of steel, and
would have entailed the drawback of a corresponding increase in draught
of water. As regards rig, the three vessels have each a different style.
The Cunard Company have adhered to their special rig--three masts, bark
rigged--believing it to be more ship shape than the practice of fitting
up masts according to the length of the ship. On these masts there is a
good spread of canvas to assist in propelling the ship. The City of Rome
is rigged with four masts; and here the handsome full-ship rig of the
Inman line has been adhered to, with the addition of the fore and aft
rigged jigger mast, rendered necessary by the enormous length of the
vessel. It will be seen that the distinctive type of the Inman line
has not been departed from in respect to the old fashioned but still
handsome profile, with clipper bow, figurehead, and bowsprit--which
latter makes the Rome's length over all 600 feet. For the figurehead
has been chosen a full length figure of one of the Roman Caesars, in the
imperial purple. Altogether, the City of Rome is the most imposing and
beautiful sight that can be seen on the water. The Alaska has also four
masts, but only two crossed.
The length of the City of Rome, as compared with breadth, insures long
and easy lines for the high speed required; and the depth of hold being
only 37 feet, as compared with the beam of 52 feet, insures great
stability and the consequent comfort of the passengers. A point calling
for special notice is the large number of separate compartments formed
by water tight bulkheads, each extending to the main deck. The largest
of these compartments is only about 60 feet long; and, supposing that
from collision or some other cause, one of these was filled with water,
the trim of the vessel would not be materially affected. With a view to
giving still further safety in the event of collision or stranding, the
boilers are arranged in two boiler rooms, entirely separated from each
other by means of a water tight iron bulkhead. This reduces what, in
nearly all full-powered steamships, is a vast single compartment, into
two of moderate size, 60 feet in length; and in the event of either
boiler room being flooded, it still leaves the vessel with half her
boiler power available, giving a speed of from thirteen to fourteen
knots per hour. The vessel's decks are of iron, covered with teak
planking; while the whole of the deck houses, with turtle decks and
other erections on the upper deck, are of iron, to stand the strains
of an Atlantic winter. Steam is supplied by eight cylindrical tubular
boilers, fired from both ends, each of the boilers being 19 feet long
and having 14 feet mean diameter. There are in all forty eight furnaces.
The internal arrangements are of the finest description. There are two
smoking rooms, and in the after deckhouse is a deck saloon for ladies,
which is fitted up in the most elegant manner, and will prevent the
necessity of going below in showery weather. At the sides of the
hurricane deck are carried twelve life boats, one of which is fitted as
a steam launch. The upper saloon or drawing-room is 100 feet long, the
height between decks being 9 feet. The grand dining-saloon is 52 feet
long, 52 feet wide, and 9 feet high, or 17 feet in the way of the large
opening to the drawing-room above. This opening is surmounted by a
skylight, and forms a very effective and elegant relief to the otherwise
flat and heavy ceiling. There are three large and fourteen small dining
tables, the large tables being arranged longitudinally in the central
part of the saloon, and the small tables at right angles on the sides.
Each diner has his own revolving arm chair, and accommodation is
provided for 250 persons at once. A large American organ is fixed at the
fore end of the room, and opening off through double spring doors at the
foot of the grand staircase is a handsome American luncheon bar, with
the usual fittings. On each side of the vessel, from the saloon to the
after end of the engine room, are placed staterooms providing for 300
passengers. The arrangements for steerage passengers are of a superior
description. The berths are arranged in single tiers or half rooms, not
double, as is usually the custom, each being separated by a passage,
and having a large side light, thus adding greatly to the light,
ventilation, and comfort of the steerage passengers, and necessitating
the advantage of a smaller number of persons in each room. The City
of Rome is the first of the two due here; she sails from Liverpool on
October 13.
In the Servia the machinery consists of three cylinder compound surface
condensing engines, one cylinder being 72 inches, and two 100 inches in
diameter, with a stroke of piston of 6 feet 6 inches. There are seven
boilers and thirty-nine furnaces. Practically the Servia is a five
decker, as she is built with four decks--of steel, covered with yellow
pine--and a promenade reserved for passengers. There is a music room on
the upper deck, which is 50 feet by 22 feet, and which is handsomely
fitted up with polished wood panelings. For the convenience of the
passengers there are no less than four different entrances from the
upper deck to the cabins. The saloon is 74 feet by 49 feet, with sitting
accommodations for 350 persons, while the clear height under the beams
is 8 feet 6 inches. The sides are all in fancy woods, with beautifully
polished inlaid panels, and all the upholstery of the saloon is of
morocco leather. For two-thirds of its entire length the lower deck is
fitted up with first class staterooms. The ship is divided into nine
water-tight bulkheads, and she is built according to the Admiralty
requirements for war purposes. There are in all twelve boats equipped
as life-boats. The Servia possesses a peculiarity which will add to her
safety, namely, a double bottom, or inner skin. Thus, were she to
ground on rocks, she would be perfectly safe, so long as the inner skin
remained intact. Steam is used for heating the cabins and saloons, and
by this means the temperature can be properly adjusted in all weathers.
In every part of the vessel the most advanced scientific improvements
have been adopted. The Servia leaves Liverpool on October 22.
The Alaska, whose owners, it is understood, are determined to make her
beat all afloat in speed, does not sail until November 5, and therefore
it is premature to say anything about her interior equipments. She is
the sister of the celebrated Arizona, and was built by the well-known
firm of Elder & Co., on the Clyde.
* * * * *
IMPROVED ROAD LOCOMOTIVE.
Several attempts have been made to connect the leading wheels of a
traction engine with the driving wheels, so as to make drivers of all of
them, and thus increase the tractive power of the engine, and to afford
greater facilities for getting along soft ground or out of holes. The
wheels with continuous railway and India-rubber tires have been employed
to gain the required adhesion, but these wheels have been too costly,
and the attempts to couple driving and leading wheels have failed. The
arrangement for making the leading wheels into drivers, illustrated
on page 4825, has been recently brought out by the Durham and North
Yorkshire Steam Cultivation Company, Ripon, the design being by Messrs.
Johnson and Phillips. The invention consists in mounting the leading
axle in a ball and long socket, the socket being rotated in fixed
bearings. The ball having but limited range of motion in the socket, is
driven round with it, but is free to move in azimuth for steering.
This engine has now been in use more than twelve months in traction
and thrashing work, and, we are informed, with complete success. The
illustrations represent a 7-horse power, with a cylinder 8 in. diameter
by 12 in. stroke, and steam jacketed. The shafts and axles are of
Bowling iron. The boiler contains 140 ft. of heating surface, and is
made entirely of Bowling iron, with the longitudinal seams welded. The
gearing is fitted with two speeds arranged to travel at 11/2 and 3 miles
per hour, and the front or hind road wheels can be put out of gear when
not required. The hind driving wheels are 5 ft. 6 in. diameter, and the
front wheels 5 ft.; weight of engine 8 tons.--_The Engineer._
[Illustration: IMPROVED ROAD LOCOMOTIVE]
[Illustration: IMPROVED ROAD LOCOMOTIVE]
* * * * *
AMERICAN MILLING METHODS.
[Footnote 1: A paper read before the meeting of the Pennsylvania State
Millers Association at Pittsburgh, Pa., by Albert Hoppin, Editor of the
_Northwestern Miller_.]
By ALBERT HOPPIN.
To speak of the wonderful strides which the art of milling has taken
during the past decade has become exceedingly trite. This progress,
patent to the most casual observer, is a marked example of the power
inherent in man to overcome natural obstacles. Had the climatic
conditions of the Northwest allowed the raising of as good winter wheat
as that raised in winter wheat sections generally, I doubt if we should
hear so much to-day of new processes and gradual reduction systems. So
long as the great bulk of our supply of breadstuffs came from the winter
wheat fields, progress was very slow; the mills of 1860, and I may even
say of 1870, being but little in advance, so far as processes were
concerned, of those built half a century earlier. The reason for this
lack of progress may be found in the ease with which winter wheat could
be made into good, white, merchantable flour. That this flour was
inferior to the flour turned out by winter wheat mills now is proven by
the old recipe for telling good flour from that which was bad, viz.: To
throw a handful against the side of the barrel, if it stuck there it was
good, the color being of a yellowish cast. What good winter wheat patent
to-day will do this? Still the old time winter wheat flour was the best
there was, and it had no competitor. The settling up of the Northwest
which could not produce winter wheat at all, but which did produce a
most superior article of hard spring wheat, was a new factor in the
milling problem. The first mills built in the spring wheat States tried
to make flour on the old system and made a most lamentable failure of
it. I can remember when the farmer in Wisconsin, who liked a good loaf
of bread, thought it necessary to raise a little patch of winter wheat
for his own use. He oftener failed than succeeded, and most frequently
gave it up as a bad job. Spring wheat was hard, with a very tender,
brittle bran. If ground fine enough to make a good yield a good share
of the bran went into the flour, making it dark and specky. If not
so finely ground the flour was whiter, but the large percentage of
middlings made the yield per bushel ruinously small. These middlings
contained the choicest part of the flour producing part of the berry,
but owing to the dirt, germ, and other impurities mixed with them, it
was impossible to regrind them except for a low grade flour. Merchant
milling of spring wheat was impossible wherever the flour came in
competition with winter wheat flours. At Minneapolis, where the millers
had an almost unlimited water power, and wheat at the lowest price,
merchant milling was almost given up as impracticable. It was certainly
unprofitable. To the apparently insurmountable obstacles in the way of
milling spring wheat successfully, we may ascribe the progress of modern
milling. Had it been as easy to raise good winter wheat in Wisconsin and
Minnesota as in Pennsylvania and Ohio, or as easy to make white flour
from spring as from winter wheat, we should not have heard of purifiers
and roller mills for years to come.
The first step in advance was the introduction of a machine to purify
middlings. It was found that the flour made from these purified
middlings was whiter than the flour from the first grinding and brought
a better price than even winter wheat flours. Then the aim was to make
as many middlings as possible. To do this and still clean the bran so
as to make a reasonable yield the dress of the burrs was more carefully
attended to, the old fashioned cracks were left out, the faces and
furrows made smooth, true, and uniform, self-adjusting drivers
introduced, and the driving gear better fitted. Spring wheat patents
rapidly rose to the first place in the market, and winter wheat millers
waked up to find their vantage ground occupied by their hitherto
contemned rivals. To their credit it may be said that they have not
been slow in taking up the gauntlet, and through the competition of the
millers of the two climatically divided sections of this country with
each other and among themselves the onward march of milling progress has
been constantly accelerated. Where it will end no man can tell, and
the chief anxiety of every progressive miller, whether he lives in
Pennsylvania or Minnesota, is not to be left behind in the race.
The millers of the more Eastern winter wheat States have a two-fold
question to solve. First, how to make a flour as good as can be found in
the market, and second, how to meet Western competition, which, through
cheap raw material and discriminating freight rates, is making serious
inroads upon the local markets. Whether the latter trouble can be
remedied by legislature, either State or national, or not, remains to be
proven by actual trial. That you can solve the first part of the problem
satisfactorily to yourselves depends upon your readiness to adopt new
ideas and the means you have at hand to carry them out. It is manifestly
impossible to make as good a flour out of soft starchy wheat as out of
that which is harder and more glutinous. It is equally impossible for
the small mill poorly provided with machinery to cope successfully
with the large merchant mill fully equipped with every appliance that
American ingenuity can suggest and money can buy. I believe, however,
that a mill of moderate size can make flour equally as good as the large
mill, though, perhaps, not as economically in regard to yield and cost
of manufacture.
The different methods of milling at present in use may be generally
divided into three distinct processes, which, for want of any better
names, I will distinguish as old style, new process, and gradual
reduction. Perhaps the German division of low milling, half high
milling, and high milling is better. Old style milling was that in
general use in this country up to 1870, and which is still followed in
the great majority of small custom or grist mills. It is very simple,
consisting of grinding the wheat as fine as possible at the first
grinding, and separating the meal into flour, superfine or extra,
middlings, shorts, and bran. Given a pair of millstones and reel long
enough, and the wheat could be made into flour by passing through the
two. Because spring wheat was so poorly adapted to this crude process,
it had to be improved and elaborated, resulting in the new process.
At first this merely consisted of purifying and regrinding the middlings
made in the old way. In its perfected state it may be said to be halfway
between the old style and gradual reduction, and is in use now in many
mills. In it mill stones are used to make the reductions which are only
two in number, in the first of which the aim of the miller is to make as
many middlings as he can while cleaning the bran reasonably well, and
in the second to make the purified middlings into flour. In the most
advanced mills which use the new process, the bran is reground and the
tailings from the coarse middlings, containing germ and large middlings
with pieces of bran attached, are crushed between two rolls. These
can hardly be counted as reductions, as they are simply the finishing
touches, put on to aid in working the stuff up clean and to permit of
a little higher grinding at first. Regarding both old style and new
process milling, you are already posted. Gradual reduction is newer,
much more extensive, and merits a much more thorough explanation. Before
entering upon this I will call your attention to one or two points which
every miller should understand.
The two essential qualities of a good marketable flour are color and
strength. It should be sharply granular and not feel flat and soft to
the touch. A wheat which has an abundance of starch, but is poor in
gluten, cannot make a strong flour. This is the trouble with all soft
wheats, both winter and spring. A wheat which is rich in gluten is hard,
and in the case of our hard Minnesota wheat has a very tender bran.
It is comparatively easy to make a strong flour, but it requires very
careful milling to make a flour of good color from it. Probably the
wheat which combines the most desirable qualities for flour-making
purposes is the red Mediterranean, which has plenty of gluten and a
tough bran, though claimed by some to have a little too much coloring
matter, while the body of the berry is white. By poor milling a good
wheat can be made into flour deficient both in strength and color, and
by careful milling a wheat naturally deficient in strength may be made
into flour having all the strength there was in the wheat originally and
of good color. Good milling is indispensable, no matter what the quality
of the wheat may be.
The idea of gradual reduction milling was borrowed by our millers from
the Hungarian mills. There is, however, this difference between the
Hungarian system and gradual reduction, as applied in this country, that
in the former, when fully carried out, the products of the different
breaks are kept separate to the end, and a large number of different
grades of flour made, while in the system, as applied in this country,
the separations are combined at different stages and usually only three
different grades of flour made, viz.: patent, baker's, or as it is
termed in Minnesota, clear flour, and low grade or red dog. In the
largest mills the patent is often subdivided into first and second, and
they may make different grades of baker's flour, these mills approaching
much nearer to the Hungarian system, though modifying it to American
methods and machinery. In mills of from three to five hundred barrels
daily capacity, it is hardly possible or profitable to go to this
subdivision of grades, owing to the excessive amount of machinery
necessary to handling the stuff in its different stages of completion.
The Hungarian system has, therefore, been greatly modified by American
millers and milling engineers to adapt it to the requirements of mills
of average capacity. This modified Hungarian system we call gradual
reduction. It can be profitably employed in any mill large enough to run
at all on merchant work. So far it has not been found practicable to use
it in mills of less than one hundred and twenty-five to one hundred and
fifty barrels capacity in twenty-four hours, and it is better to have
the mill of at least double this capacity.
Gradual reduction, as its name implies, consists in reducing the
wheat to flour, shorts, and bran, by several successive operations or
reductions technically called breaks, the process going on gradually,
each break leaving the material a little finer than the preceding one.
Usually five reductions or breaks are made, though six or seven may be
used. The larger the number of breaks the more complicated the system
becomes, and it is preferable to keep it as simple as possible, for even
at its simplest it requires a good, wide-awake thinking miller to handle
it successfully. When it is thoroughly and systematically carried out in
the mill it is without question as much in advance of the new process as
that is ahead of the old style of milling.
In order that I may convey to you as clear an idea of gradual milling
reduction as possible, I will give as fully as possible the programme of
a mill of one hundred and fifty barrels maximum daily capacity designed
to work on mixed hard and soft spring wheat, and which probably will
come much nearer to meeting the conditions under which you have to mill
than any other I have found readily obtainable. I have chosen a mill of
this size, first, because following out the programme of a larger one
would require too much time and too great a repetition of details and
not give you any clearer idea of the main principles involved, and
secondly, because I thought it would come nearer meeting the average
requirements of the members of your association. Your worthy secretary
cautioned me that I must remember that I was going to talk to winter
wheat millers. The main principles and methods of gradual reduction are
the same, whether applied to spring or winter wheat; the details may
have to be varied to suit the varying conditions under which different
mills are operated. For this programme I am indebted to Mr. James Pye,
of Minneapolis, who is rapidly gaining an enviable and well deserved
reputation as a milling engineer, and one who has given much study to
the practical planning and working of gradual reduction mills.
And right here let me say that no miller should undertake to build
a gradual reduction mill, or to change over his mill to the gradual
reduction system, until he has consulted with some good milling engineer
(the term millwright means very little nowadays), and obtained from him
a programme which shall fit the size of the mill, the stock upon which
it has to work, and the grade of flour which it is to make. This
programme is to the miller what a chart is to the sailor. It shows him
the course he must pursue, how the stuff must be handled, and where it
must go. Without it he will be "going it blind," or at best only feeling
his way in the dark. A gradual reduction mill, to be successful, must
have a well-defined system, and to have this system, the miller must
have a definite plan to work by. But to go on with my programme.
The wheat is first cleaned as thoroughly as possible to remove all
extraneous impurities. In the cleaning operations care should be taken
to scratch or abrade the bran as little as possible, for this reason:
The outer coating of the bran is hard and more or less friable. Wherever
it is scratched a portion is liable to become finely comminuted in the
subsequent reductions, so finely that it is impossible to separate it
from the flour by bolting, and consequently the grade of the latter is
lowered. The ultimate purpose of the miller being to separate the flour
portion of the berry from dirt, germ, and bran it is important that he
does not at any stage of the process get any dirt or fine bran speck or
dust mixed in with his flour, for if he does he cannot get rid of it
again. So it must be borne in mind that at all stages of flouring, any
abrasion or comminution of the bran is to be avoided as far as possible.
After the wheat is cleaned, it is by the first break or reduction split
or cut open, in order to liberate the germ and crease impurities. As
whatever of dirt is liberated by this break becomes mixed in with the
flour, it is desirable to keep the amount of the latter as small as
possible. Indeed, in all the reductions the object is to make as little
flour and as many middlings as possible, for the reason that the latter
can be purified, while the former cannot, at least by any means at
present in use. After the first break the cracked wheat goes to a
scalping reel covered with No. 22 wire cloth. The flour, middlings,
etc., go through the cloth, and the cracked wheat goes over the tail of
the reel to the second machine, which breaks it still finer. After this
break the flour and middlings are scalped out on a reel covered with
No. 22 wire cloth. The tailings go to the third machine, and are still
further reduced, then through a reel covered with No. 24 wire cloth. The
tailings go to the fourth machine, which makes them still finer, then
through a fourth scalping reel the same as the third. The tailings from
this reel are mostly bran with some middlings adhering, and go to the
fifth machine, which cleans the bran. From this break the material
passes to a reel covered with bolting cloth varying in fineness from No.
10 at the head to No. 00 at the tail. What goes over the tail of this
reel is sent to the bran bin, and that which goes through next to the
tail of the reel, goes to the shorts bin. The middlings from this reel
go to a middlings purifier, which I will call No. 1, or bran middlings
purifier. The flour which comes from this reel is sent to the chop reel
covered at the head with say No. 9, with about No. 5 in the middle and
No 0 at the tail. You will remember that after each reduction the flour
and middlings were taken out by the scalping reels. This chop, as it is
now called, also goes to the same reel I have just mentioned. The
coarse middlings which go over the tail of this reel go to a middlings
purifier, which I will designate as No. 2. These go through the No. 0
cloth at the tail of the reel purifier No. 3; those which go through No.
5 cloth got to purifier No. 4; while all that goes through the No. 9
cloth at the head of the reel is dropped to a second reel clothed with
Nos. 13 to 15 cloth with two feet of No. 10 at the tail. The flour from
this reel goes to the baker's flour packer; that which drops through the
No. 10 is sent to the middlings stone, while that which goes over the
tail of the reel goes to purifier No. 4. We have now disposed of all the
immediate products of the first five breaks, tracing them successively
to the bran and shorts bins, to the baker's flour packer and to the
middlings purifiers, a very small portion going to the middlings stone
without going through the purifiers.
The middlings are handled as follows in the purifiers. From the No. 1
machine, which takes the middlings from the fifth break, the tailings go
to the shorts bin, the middlings which are sufficiently well purified go
to the middlings stone, while those from near the tail of the machine
which contain a little germ and bran specks go to the second germ rolls,
these being a pair of smooth rolls which flatten out the germ and crush
the middlings, loosening adhering particles from the bran specks. From
the second germ rolls the material goes to a reel, where it is separated
into flour which goes into the baker's grade, fine middlings which are
returned to the second germ rolls at once, some still coarser which go
to a pair of finely corrugated iron rolls for red dog, and what goes
over the tail of the reel goes to the shorts bin. The No. 2 purifier
takes the coarse middlings from the tail of the first or chop reel as
already stated. The tailings from this machine go to the shorts bin,
some few middlings from next the tail of the machine are returned to the
head of the same machine, while the remainder are sent to the first germ
rolls. The reason for returning is more to enable the miller to keep a
regular feed on the purifiers than otherwise. The No. 3 purifier takes
the middlings from the 0 cloth on the chop reel. From purifier No. 3
they drop to purifier No. 5. A small portion that are not sufficiently
well purified are returned to the head of No. 3, while those from the
head of the machine, which are well purified, are sent to the middlings
stones. The remainder, which contain a great deal of the germ, are taken
to the first germ rolls, in passing which they are crushed lightly to
flatten the germ without making any more flour than necessary. The No. 4
purifier takes the middlings from No. 2 and also from No. 5 cloth on
the chop reel and from the No. 10 on the tail of the baker's reel. The
middlings from the head of this machine go to the middlings stones, and
the remainder to purifier No. 6. The tailings from Nos. 3, 4, 5, and 6
go to the red dog rolls. A small portion not sufficiently well purified
are returned from No. 6 to the head of No. 4, while the cleaned
middlings go to the middlings stones.
The portions of the material which have not been traced either to the
baker's flour or the bran and shorts bins are the middlings which have
gone to the middlings stones, the germy middlings which have gone to the
first germ rolls, and the tailings from purifiers Nos. 3, 4, 5, and 6,
and some little stuff not quite poor enough for shorts from the reel
following the second germ rolls. Taking these _seriatim_: the middlings
after passing through the middlings stones, go to the first patent reel
covered with eleven feet of No. 13 and four feet of No. 8. The flour
from the head of the reel goes to the patent packer, that from the
remainder of the reel is dropped to another reel, while the tailings go
to the No. 4 purifier. The lower patent reel is clothed with No. 14 and
two feet of No. 10 cloth; from the head of the reel the flour goes to
the patent packer, the remainder that passes through the No. 10 cloth
which will not do to go into the patent, being returned to the middlings
stones, while the tailings are sent to the No. 4 purifier.
The germ middlings, after being slightly crushed as before stated, are
sent to a reel covered with five feet of No. 13 cloth, five feet of No.
14, and the balance with cloth varying in coarseness from No. 7 to No.
00. The flour from this reel goes into the patent, the tailings to the
red dog rolls, the middlings from next the tail of the reel which still
contain some germ to the second germ rolls, while the middlings which
are free from germ go to the middlings stones.
The tailings from purifiers 3, 4, 5, and 6, the material from the reel
following the second germ rolls, which is too good for shorts, but not
good enough to be returned into middlings again, and the tailings from
the reel following the first germ rolls are sent to the red dog rolls,
which, as I have stated, are finely corrugated. Following these rolls is
the red dog reel. The flour goes to the red dog bin, the tailings to
the shorts bin, while some stuff intermediate between the two, not fine
enough for the flour but too good for shorts, is returned to the red dog
rolls.
This finishes the programme. I have not given it as one which is exactly
suited to winter wheat milling. However, as I said before, the general
principles are the same in either winter or wheat gradual reduction
mills, and the various systems of gradual reduction, although they
differ in many points, and although there are probably no two engineers
who would agree as to all the details of a programme, the main ideas
are essentially the same. The system has been well described as one of
gradual and continued purification. In the programme above given the
idea was to fit up a mill which should do a maximum amount of work of
good quality with a minimum amount of expenditure and machinery. In a
larger mill or even in a mill of the same capacity where money was not
an object, the various separations would probably be handled a little
differently, the flour and middlings from the first and fifth breaks
being handled together, and those from the second, third, and fourth
breaks being also handled together. The reason for this separation being
that the flour from the first and fifth breaks contain, the first a
great deal of crease dirt, and the fifth more bran dust than that from
the other breaks, the result being a lower grade of flour. The object
all along being to keep the amount of flour with which dirt can get
mixed as small as possible, and not to lower the grade of any part of
the product by mixing it with that which is inferior, always bearing in
mind that the aim is to make as many middlings as possible, for they can
be purified while the flour can not, and that whenever any dirt is once
eliminated it should be kept out afterwards. This leads me to say that
if a miller thinks the adoption of rolls or reduction machines is all
there is of the system, he is very much mistaken. If anything, more of
the success of the mill depends upon the careful handling of the stuff
after the breaks are made, and here the miller who is in earnest to
master the gradual reduction system will find his greatest opportunities
for study and improvement. A few years back it was an axiom of the trade
that the condition of the millstone was the key to successful
milling. This was true because the subsequent process of bolting was
comparatively simple. Now the mere making of the breaks is a small
matter compared with the complex separations which come after. In
the foregoing programme we had five breaks or successive reductions.
Although this is better than a smaller number, I will here say that
it is not absolutely essential, for very good work is done with four
breaks. The mill for which this programme was made, including the
building, cost about $15,000, and is designed to make about sixty per
cent. of patent, thirty-five per cent. of baker's, and five per cent.
of low grade, results which are in advance of many larger and more
pretentious mills.
One difficulty in the way of adapting the gradual reduction system to
mills of very small capacity is that the various machines require to be
loaded to a certain degree in order to work at their best. It is only a
matter of short time when our milling inventors will design machinery
especially for small mills; in fact they are now doing it, and every
day brings it more within the power of the small miller to improve his
manner of milling. To show what can be done in this direction I will
briefly describe a mill of about ninety barrels maximum capacity per
twenty-four hours, which is as small as can be profitably worked. I will
premise this description by saying it is designed with a view to the
greatest economy of cost, the best trade of work, and to reduce the
amount of machinery and the handling of the stuff as much as possible.
This latter point is of much importance in any mill, either large or
small, no matter upon what system it is operated, for it takes power to
run elevators and conveyors, and especially in elevating and conveying
middlings, especially those made from winter wheat, their quality is
inured and a loss incurred, by the unavoidable amount of flour made by
the friction of the particles against each other. So much is this the
case that in one of our largest mills it is deemed preferable to move
the middlings from one end of the mill to the other by means of a hopper
bin on a car which runs on a track spiked to the floor, rather than to
employ a conveyor. A mill built as I am going to describe would require
from fifty to sixty horse-power to run it, and including steam power and
building would cost from $10,000 to $12,000, according to location. I
give it as of interest to those among your number who own small mills
and may contemplate improving them.
The building is four stories high, including basement, and thirty-two
feet square. It would be some better to have it larger, but it is made
this small to show how small a space a mill of this size can be made to
occupy. No story is less than twelve feet high. The machinery Is very
conveniently arranged, and there is plenty of room all around. The
system is a modification of the gradual reduction system, the middlings
being worked upon millstones. The first break is on one pair of 9 x
18 inch corrugated iron rolls, eight corrugations to the inch, the
corrugations running parallel with the axis of the rolls. The second
break on rolls having twelve corrugations to the inch, the third
sixteen, and the fourth twenty to the inch, while the fifth break, where
the bran is finally cleaned, has twenty-four corrugations to the inch.
The basement contains the line shaft and pulleys for driving rolls,
stones, cockle machine, and separator. The only other machinery in the
basement is the cockle machine. The line shaft runs directly through
the center of the basement, the power being from engine or water wheel
outside the building. The first floor has the roller mills in a line
nearly over the line shaft below, the middlings stones, two in number,
at one side opposite the entrance to the mill, the receiving bin at
one side of the entrance in the corner of the mill, and the two flour
packers for the baker's and patent flour in the other corner. This
arrangement leaves over half of the floor area for receiving and packing
purposes. The bolting chests, one with six reel and the other with three
reel begin on the second floor and reach up into the attic. An upright
shaft from the line shaft in the basement geared to a horizontal shaft
running through the attic parallel with the line shaft below, comprise
about all the shafting there is in the mill. There is a short shaft on
the second floor from which the two purifiers on this floor and the two
in the attic are driven, and another short shaft on the first floor to
drive the packers. There are four purifiers, two on the second floor,
and two more directly over them in the attic. The elevator heads are all
directly upon the attic line shaft, and the bolting chests are driven by
uprights dropped from this shaft. The combined smutter and brush machine
is on the third floor at one end of the bolting chests and directly over
the stock hoppers. This comprises all the machinery in the mill. The
programme is about as follows:
The break reels are clothed as follows: First break No. 20, wire cloth,
second break No. 22, third break No. 24, and fourth break No. 24. The
material passing through these scalping reels, now called chop, goes to
a series of reels, the first clothed with Nos. 6, 4, and 0. The material
passing over the tail is sent to the germ purifier, that passing through
Nos. 4 and 0, to the coarse middlings purifier, and that through the No.
6 goes to the reel below clothed with Nos. 12 and 13. Some nice granular
flour is taken off from this reel; the remainder, which passes over the
tail and through the cutoffs, goes to the next reel below clothed with
Nos. 14, 15, and 9. Some good flour comes from the 14 and 15; that which
passes through the 9 goes at once to the stones without purifying, while
that which passes over the tail is sent to the fine middlings purifiers.
After the purification, the middlings are ground on stones and bolted
on Nos. 13 and 14 cloth, after having been scalped on No 8. The germ
middlings are crushed on smooth rolls and bolted on Nos. 12 and 13. What
is not crushed fine enough goes with poor tailings to the second germ
rolls, and from these to a reel by themselves or to the fifth reduction
or bran reel. A mill of this kind could be made much more perfect by an
expenditure of two or three thousands dollars more. I have instanced it
to show what can be done with gradual reduction in a very small way.
In mills of from three hundred to five hundred barrels capacity and
still larger, the programme differs considerably from that I have
sketched, the middlings being graded and handled with little, if any,
returning, and are sized down on the smooth rolls, a much larger
percentage of the work of flouring being done on millstones. For a three
hundred barrel roller mill, the following plant is requisite: five
double corrugated roller mills, five double smooth roller mills, three
pairs of four foot burrs sixteen purifiers, four wire scalping reels,
six feet long, one reel for the fifth break, one reel for low grade
flour, eight chop reels, seven reels for flour from smooth rolls, three
reels for the stone flour, two grading reels, three flour packers, and
necessary cleaning machinery. The reels are eighteen feet thirty-two
inches. The programme is necessarily more complicated.
When it comes to the machinery to be employed in making the reductions
or breaks, the miller has several styles from which to choose. Which is
best comes under the head of what I don't know, and moreover, of that
which I have found no one else who does know. Each machine has its good
points, and the mill owner must make his own decision as to which is
best suited to his purpose. The main principles involved are to abrade
the bran as little as possible while cleaning it thoroughly, and to make
as little break flour, and as many middlings as possible, the latter to
be made in such shape as to be the most easily purified. Regarding
the difference between spring and winter wheat for gradual reduction
milling, it may be stated something after this manner: Spring wheat
has a thinner and more tender bran, makes more middlings because it is
harder, and for the same reason the flour is more inclined to be coarse
and granular. In milling with winter wheat, especially the better
varieties, there will be more break flour made, the middlings will be
finer with fewer bran specks, and the bran more easily cleaned, because
it will stand harsher treatment. Winter wheat, moreover, requires more
careful handling in making the breaks, not because of the bran, but to
avoid breaking down the middlings, and making too much and too fine and
soft break flour. In order to keep the flour sharp and granular, coarser
cloths are used in bolting, and because the middlings are finer the
bolting is not so free and a larger bolting surface is required. In
milling either spring or winter wheat there should be ample purifying
capacity, it being very unwise to limit the number of machines, so that
any of them will be overtaxed. The day has gone by when one purifier
will take care of all the middlings in the mill.
There is one point which is of much interest to mill owners who wish to
change their mills over to the gradual reduction process, that is, how
far they can utilize their present plan of milling machinery in making
the change. Of course the cleaning machinery is the same In both cases,
so are the elevators, conveyors, bolting chests, etc. But to use the
millstone is a debatable question. After carefully considering the
matter I have come to the conclusion that it has its place, and an
important one at that, under the new regime, viz., that of reducing
the finer purified middlings to flour. The reason for this lies in the
peculiar construction of the wheat berry. If the interior of the berry
were one solid mass of flour, needing only to be broken up to the
requisite fineness, it could be done as well on the rolls. But instead
of this, as is well known, the flour part of the berry is made up of
a large number of granules or cells, the walls of which are cellular
tissue, different from the bran in that it is soft and white instead of
hard and dark colored. It is also fibrous to a certain extent, and when
the fine middlings are passed between the rolls instead of breaking
down and becoming finer, it has a tendency to cake up and flatten out,
rendering the flour soft and flaky. It does not hurt the color, but it
does hurt the strength. When the millstone is used in place of the roll
the flour is of equally good color, and more round and granular. I
know that in this the advocates of smooth rolls will differ from my
conclusions, but I believe that the final outcome will be the use of
millstones on the finer middlings, and in fact on all the middlings that
are thoroughly freed from the germ.
It has been said that that which a man gives the most freely and
receives with the worst grace is advice. I will, however, close with a
little of the article which may not be wholly put of place. If you have
a mill do not imagine that the addition of a few pairs of rolls, a
purifier or two, and a little overhauling of bolting-chests, is going to
make it a full-fledged Hungarian roller mill. If you are going to change
an old mill or build a new one, do not take the counsel or follow the
plans of every itinerant miller or millwright who claims to know all
about gradual reduction. No matter what kind of a mill you want to
build, go to some milling engineer who has a reputation for good work,
tell him how large a mill you want, show him samples of the wheat it
must use and the grades of flour it must make, and have him make a
programme for the mill and plan the machinery to fit it. Then have the
mill built to fit the machinery. When it starts follow the programme,
whether it agrees with your preconceived notions or not, and the mill
will, in ninety-nine cases out of one hundred, do good work.
* * * * *
MACHINE FOR DOTTING TULLES AND OTHER LIGHT FABRICS.
Dotted or chenilled tulles are fabrics extensively used in the toilet
of ladies, and the ornamentation of which has hitherto been done by
the application to the tissue, by hand, either of chenille or of small
circles previously cut out of velvet. This work, which naturally takes
considerable time, greatly increases the cost price of the article.
A few trials at doing the work mechanically have been made, but without
any practical outcome. The workwomen who do the dotting are paid at
Lyons at the rate of 80 centimes per 100 dots; so that if we take
tulle with dots counter-simpled 0.04 of an inch, which is the smallest
quincunx used, and suppose that the tissue is 31 inches wide and that
the daily maximum production is one yard, we find that 400 dots at 80
centimes per 100 = 3 francs and 20 centimes (about 63 cents), the cost
of dotting per yard. It is true that the workwoman furnishes the velvet
herself.
Mr. C. Ricanet, of Lyons, has recently invented a machine with which he
effects mechanically the different operations of dotting, not only on
tulles but also upon gauzes or any other light tissues whatever, such
as those of cotton, silk, wool, etc. Aided by a talented mechanic, Mr.
Ricanet has succeeded in constructing one of those masterpieces of
wonderfully accurate mechanism of which the textile industry appears
to have the monopoly--at least it is permissible to judge so from the
remarkable inventions of Vaucanson, Jacquard, Philippe de Girard,
Heilmann, and others.
The object of this new machine, then, which has been doing its wonderful
work for a few days only, is to reproduce artificially chenille
embroidered on light tissues, by mechanically cutting out and gluing
small circles of velvet upon these fabrics.
For this purpose all kinds of velvet may be employed, and, in order to
facilitate the cutting, they are previously coated on the reverse side
with any glue or gum whatever, which gives the velvet a stiffness
favorable to the action of the punch. To effect the object desired the
apparatus has three successive operations to perform: first, cutting the
circles; second, moistening; and third, fastening down the dots upon the
tissue according to a definite order and spacing. The machine may be
constructed upon any scale whatever, although at present it is only made
for operating on pieces 31 inches wide, that being the normal width of
dotted tulles. The quincuncial arrangement of the dots is effected by
the punching, moistening, and fastening down of odd and even dots,
combined with the forward movement of the tissue to be chenilled.
The principal part of the machine is the cam-shaft, A (Figs. 1, 2, and
3), which revolves in the direction of the arrows and passes in the
center of 80 cam-wheels, 40 of which are odd and 40 even, alternately
opposed to each other. This shaft actuates, through its two extremities,
the different combined motions in view of the final object to be
attained, and also carries the motive pulleys, PP'. Figs. 1 and 2 show
the profile of two of these opposed cam-wheels--the arrangement by means
of which two rows of dots (odd and even) are laid down upon the tissue
during one revolution of the shaft or drum, A. Each of the wheels
carries three cams (Figs. 1 and 3), the first, (_a_), corresponding to
the punching; the second, (_a'_), to the moistening, and the third,
(_a''_), to the gluing down of the dots.
The annexed figure, one-quarter actual size, shows in section the
details of the cutting mechanism. To each cam-wheel there corresponds
one punch, and the eighty punches are arranged side by side and parallel
upon a shaft, B, a spring, _b_, holding them constantly against the
circumference of the cam-wheels. In Fig. 2 only one of these details is
shown. The punching arrangement consists of an ordinary punch, _c_, of
variable diameter, screwed to the extremity of a tube, _d_, which is
itself suspended from the end of the lever, _p_, but which can receive
from it at the desired moment the pressure necessary to effect the
cutting. The vertical position of these multiple tubes is insured by
a guide, _e_, which is thoroughly indispensable. Through each of the
tubes, _d_, there passes a plunger designed for expelling from the punch
the piece that has been cut out of the velvet, and for gluing it down to
the fabric. The two small springs, _b'_ and _b''_, tend continually to
lift the tubes as well as the plunger. The whole mechanism is affixed to
solid cast-iron frames, and the machine itself may be mounted on wooden
supports or a metal frame.
The punching is effected on a bronze straight-edge, C, which slides in a
cast-iron channel, D. This presents alternately, in its movement, entire
and punctured spaces, the former for receiving the blow of the punch and
the latter for allowing passage at the desired moment to the plunger
as it goes to fasten the dots upon the tulle which is passing along
underneath the channel, D. The punching is done primarily and
principally by pressure, but, in order to facilitate the complete
detachment of filaments which might retain the punched-out piece, the
punch is likewise given at the same time a slight rotary motion, thus
imitating mechanically what is performed by hand in the maneuver of all
punches. This rotary motion is communicated to the punches by means of
levers actuated by an eccentric, E, and which move the frame, _h_, whose
bars engage with the horizontal lever, _g_, soldered to the tube, _d_,
thus causing the latter at the very moment the punch descends to revolve
from right to left. The forty punches in operation cause the frame to
return to its initial position through the action of the springs, _b'_.
We say forty, since the inventor, in principle, has admitted 80 punches,
operating 40 as odd and 40 as even; obtaining in this way a dotting in
a regular quincunx of one yard, that is to say, 80 dots arranged in two
rows on a fabric 31 inches wide. But it is evident that a much larger
quincunx may be had by putting in play only a half, a third, or a
fourth of the punches, and causing the tulle and velvet to advance
proportionally. For this purpose it is only necessary to unscrew the
punches which are not to act, and to substitute for the ratchet wheel
which controls the unrolling of the I tulle, another having a number of
teeth proportioned to the desired spacing of the dots.
The punching having been executed, and the drum, A, continuing to
revolve, the punches rise a little owing to the conformation of the
cam-wheel, and through the action of the springs, _b_, and allow the
moistener to move forward to dampen the little circles which remain at
the orifice of the punches. The moistener or dampener is a sort of pad
equal in length to the field of action of the punches, and is affixed
to a cross-bar, F, which is connected at its two extremities with the
levers, G, that are actuated by the cam-wheels, H. These cam-wheels, or
eccentrics, H, which are mounted on the shaft of the drum, A, cause the
moistener to move forward as soon as the punches rise after operating,
and, when it arrives beneath the punches, the larger cams, _a_, of
the cam-wheels, A, press the latter upon the pad and thus effect the
dampening of the circles of velvet.
Immediately afterwards, the same eccentrics, H, acting on a lever, I,
uncover the holes in the straight-edge, C, and the channel, D. The
large cams, _a"_, of the wheel, A, then acting very powerfully upon the
respective punches, cause these latter to pass through the orifices so
that the extremity of each punch comes within about one twenty-fifth of
an inch of the fabric to be dotted. In this passage of the tube, _d_, a
small rod, _i_, connected by a lever with the plunger, _f_, is made to
abut against the guide, _e_, thus causing the descent of the plunger to
a sufficient degree to push the velvet "dot" out of the tube and to glue
it upon the fabric. The manner in which these operations are performed
being now well enough understood, let us for a moment examine the
motions of the fabrics to be cut and dotted--the first being velvet or
any other material, even metal (goldleaf, for example), and the second,
the tulle.
The latter has but one motion, and that is in the direction of its
length, while the velvet has, in addition to this same motion, another
slight one from right to left in the direction of its width in order to
diminish waste as much as possible.
The tulle to be dotted is first wound around a roller, R, from whence it
passes over the glass guide-roller, R', and between the channel, D, and
the table, T, to the roller, R", which is heated by steam.
The hot air which is radiated dries the dots, and from thence the fabric
is taken up by other rollers or by any other method. The steam roller,
R", carries at one of its extremities a ratchet wheel whose teeth vary
in number according to the greater or less rapidity with which the tulle
is unrolled. It is actuated by a lever which receives its motion from
the eccentric, K.
[Illustration: IMPROVED MACHINE FOR DOTTING TULLAND OTHER LIGHT
FABRICS.]
In the table, T, there is a rectangular receptacle, _t_, containing
rasped or powdered velvet for the purpose of forming a reverse of the
dot. This powder attaches itself to the gum and imitates on the wrong
side of the fabric a dot similar to that on the upper or right side. The
velvet is wound upon the roller, _r_, and from thence passes under the
guiding roller, _r'_, the punches, and the second roller, _r"_. These
two latter rollers are solidly connected by a straight-edge fixed at the
extremity of the lever, L, whose other end is in continuous correlation
with the eccentric, M, which controls the lateral displacements;
while the eccentric, O, actuates, by means of the screw, Q, and the
ratchet-wheel, S, the longitudinal advance of the velvet. The eccentric,
M, is fixed upon an axle, A', which carries a wheel, U, having teeth
inclined with respect to its axis, and which derives its motion from the
Archimedean screw, N, fixed at one of the extremities of the cam-shaft,
A.
We have stated above that the maximum daily hand production of tulle
dotted in quincunxes of 0.04 of an inch is about one yard. At the rate
of 30 revolutions per minute, and for the same article as that just
mentioned, this dotting machine is capable of producing, theoretically,
360 yards per 10 hours; but practically this production is reduced to
about 250 yards, which, however, is sufficiently satisfactory.
* * * * *
THE REPRODUCTION AND MULTIPLICATION OF NEGATIVES.
By ERNEST EDWARDS, B.A.
A question, relative to the subject of reproducing negatives, which was
put at a meeting of one of your New York societies, prompts me to make a
few remarks on the subject.
Among the numerous and widely diversified ramifications of our business
(the Heliotype Printing Company) we have very often to reproduce and
multiply negatives in both a direct and reversed form. Various methods
for doing this have been tried, and I may here say that I am quite well
aware of all the methods that have hitherto been suggested for the
purpose, but that which I am to describe is the one to which preference
has been given, and which is that known as the carbon process.
A sheet of carbonized paper or "tissue," having been sensitized by
immersion in a bath of bichromate of potash, is dried in the dark and
placed away for future use, although it is undesirable that it be kept
for more than four or five days. This is placed in a printing frame in
contact with the negative and exposed for a few minutes, after which it
is immersed in water, squeegeed down upon a glass plate, and developed
with warm water in the way so well known to carbon printers. The result
is a transparency which, owing to having received a sufficient exposure,
should show every detail of the negative. The nature of the tissue
employed for such a purpose must be such as to give no strong contrasts,
but everything reproduced with soft and fine gradation of tone.
The transparency thus obtained forms the _cliche_ by which the negatives
are subsequently made; and a negative of any size may be obtained by
the camera on wet or dry plates. The transparency must, of course, be
pointed to the sky and the light transmitted through it, no other light
being allowed to reach the lens except that which passes through the
carbon transparency. Care must also be taken that the transparency is
_uniformly_ lighted. If it is not possible to obtain a northern light,
which is best, a reflector of white paper or card may be used which must
be sufficiently large and placed at an angle of about forty-five degrees
to the transparency.
If the repeated negative is to be of the same size as the original it
may be readily produced by repeating the operation of printing on carbon
tissue, using the transparency in place of the negative, or using a dry
plate in place of the tissue. But on the whole I have satisfied myself
that the best results are to be obtained by the first method. There is
a greater softness in the latter method, but a greater character and
similarity to the original in the former method. There is no doubt that
the use of the carbon transparency removes the hardness and riffidness
of the outlines peculiar to the older method of a collodion
transparency, while with carbon as the medium it is difficult for
any but the most experienced eye to distinguish the copy from the
original.--_Photo Times._
* * * * *
A NEW METHOD OF MAKING GELATINE EMULSION.
Since gelatine emulsion first came into use one of the greatest troubles
in connection with the manufacture of it has been that of washing.
According to the first methods the time taken for this part of the
process was, I believe, about twenty-four hours. It was very much
reduced and the ease of manufacture greatly facilitated by the methods
now most generally used, and which were, I believe, first communicated
by Messrs. Wratten and Wainright. I refer to those of precipitating with
alcohol and of straining the emulsion, when set, through canvas, so
as to divide it very finely. When the latter method is resorted to a
comparatively short time is sufficient to wash it. This method, although
a great improvement upon the older ones, yet leaves much to be desired,
especially for those who are not in the habit of making emulsion
regularly, but only an occasional batch. When the weather is at all warm
it takes a long time for the emulsion to set, unless ice be used, and
when once it is set the washing process is an exceedingly "messy" one
unless the water be cooled with ice; and the amount of water taken up
during washing is often so great that there is considerable difficulty
in getting the emulsion to set on the plates. In fact, even in cold
weather, it is not an easy process to conduct in the necessary near
approach to total darkness.
Considerable suspicion has of late been thrown upon the thoroughness of
the alcohol method, unless the emulsion has, previous to precipitation,
been freed of the greater part of the soluble salts by washing; that is
to say, it is doubtful whether the whole of the soluble salts can be
eliminated by the process, and, therefore, unless in exceptionally hot
weather, it would seem best not to trust to it, except as a further
security against soluble bromide and nitrate after washing. Besides
this, the consumption of alcohol is very large. Almost three times the
amount of the emulsion precipitated is required, and this, even when
methylated spirit is used, adds considerably to the expense. With a view
of doing away with the washing altogether, or, rather, of washing of
the silver bromide when not incorporated with the gelatine, several
processes have been invented. By these silver bromide is obtained in a
very fine state of division, ready to mix with gelatine and water in any
proportion.
The best known of them is Captain Abney's very ingenious glycerine
method, which seems to have been thoroughly successful in his hands,
although it has not been in every one's. The silver bromide obtained by
his process is not highly sensitive, and requires boiling with gelatine
before it is in a fit state to make a rapid plate.
We have lately had described in these columns a method of obtaining
bromide in a highly-sensitive state by means of the use of an acid,
whereby, after emulsifying and boiling, the viscosity of the gelatine
was destroyed, and the bromide in time deposited itself. During the late
hot weather, when washing became almost impossible, I was led to cast
about for some method of eliminating the soluble salts less tedious and
"sloppy" than that of washing, more certain and less expensive than that
of precipitating the whole of gelatine with alcohol, and which would
take less time than the method of obtaining the bromide in a pure form.
My first idea was to make up the solutions used in emulsifying in a very
concentrated form, and, after emulsifying, boiling, and allowing to
cool, to add to the thin emulsion thus obtained gelatine to the amount
of twenty grains to the ounce, and to precipitate this with alcohol,
the rest of the gelatine required to make up the bulk being afterwards
added, and the whole thoroughly incorporated by warming and shaking.
I was thus successful in reducing the amount of alcohol required to
one-third of what would be necessary if the whole of the emulsion were
precipitated; but still I found that, if a reliable emulsion were
required, the pellicle as formed had to be washed to free it from the
last trace of soluble salts.
It now struck me that it might be possible to precipitate the bromide of
silver direct from a very weak solution of gelatine, and obtain it in
such a form that it might be filtered, washed, and in every way treated
as an ordinary precipitate. I tried the following experiment. I took--
1. Silver nitrate....................... 200 grains
Water............................... 11/2 ounce.
2. Ammonia bromide...................... 120 grains.
Water................................ 11/2 ounce.
Gelatine............................. 12 grains.
I emulsified the two together in the usual way, allowed the whole
to cool, and then poured the thin emulsion into about ten ounces
of alcohol, stirring the while. As I had anticipated, a flocculent
precipitate was formed, which settled to the bottom of the vessel in a
few minutes. This was, in fact, sensitive bromide of silver mixed with
a very small quantity of gelatine (about five per cent.), and could, I
found, be treated in the same manner as a bromide precipitate from
an aqueous solution; it might be washed, either by decantation or by
filtration, easily dried, and doubtless could, when dry, be kept for an
indefinite time, and be at any time used by mixing with gelatine and
water in any proportion thought fit.
I found that a less amount of gelatine than four grains to the ounce was
sufficient to carry the bromide down, while five grains to the ounce
carried it down in something which I considered too near an approach to
a plastic mass.
It will be noticed that in the experiments which I have described the
emulsion had not been boiled, so that the sensitiveness of the bromide
was probably not great. As the experiment was done in daylight it was
of no practical use for making emulsion; but I have since made several
batches in this manner and have found them most satisfactory.
When sensitiveness is sought by boiling I rind it necessary to add a
small quantity of gelatine after boiling and before precipitating, as
that which has been kept for some time at a high temperature seems to
have lost the viscosity necessary to carry down the silver bromide in
such a form that it can he easily separated from the alcohol and water.
The practical manner of making an emulsion by this method may be as
follows. Make up the following mixtures:
I.
Silver nitrate...........................................400 grains.
Water..................................................... 3 ounces.
II.
Ammonia bromide..........................................240 grains.
Gelatine..................................................24 grains
Water..................................................... 3 ounces.
Hydrochloric acid enough to slightly acidify the solution.
III.
Gelatine................................................. 20 grains.
Water.................................................... 1/2 ounce.
IV.
Hard gelatine (say Nelson's X opaque,
or Mr. A. L. Henderson's)................................240 grains.
Soft gelatine (Nelson's No.1)........................... 240 grains.
Water.....................................................24 ounces.
Nos. II., III., and IV. are allowed to stand until the gelatine is
softened. No. I is then warmed in a hock bottle until the gelatine is
just melted, when No. II. is poured into it, a little at a time, with
vigorous shaking, until the whole is emulsified. It is then transferred
to an ordinary jelly can, which is placed in a saucepan half full of
water over a ring Bunsen burner in the dark room, and boiled for half an
hour. It is then allowed to cool to about 100 deg. Fahr., when No. III. is
added. The whole is then allowed to get quite cool, when it is poured,
with stirring, into about one pint of methylated spirit. If it be wished
the precipitate may now be filtered out and washed at once like an
ordinary filtrate, but I prefer to allow it to settle, which it will do
in about five minutes. The supernatant fluid is then gently poured off.
This fluid will have the appearance of still containing a considerable
amount of the silver bromide; but if it be kept and filtered it will be
seen that the quantity is really so small that it may be disregarded. We
all know what an alarming quantity of silver seems to be going down the
sink when we wash vessels to which a very small quantity of emulsion is
adhering. If filtering be resorted to the liquid which comes through
will be quite clear. This was somewhat unexpected by me, as, if an
emulsion containing the whole of the gelatine be precipitated into
alcohol in the usual way, the alcohol becomes milky with a substance
which could not, I imagine, be filtered from it.
Two or three ounces of methylated spirit are now added to the vessel
containing the silver bromide, and the latter well mixed with it. This
makes the precipitate "firmer"--if such an expression be allowable--and
this time it will sink to the bottom almost immediately after the
stirring has ceased, and the alcohol may be poured off.
I consider that the bromide in this state is practically free from
soluble salts, but it may be washed with one or two changes of water if
desired.
No. IV. is now gently heated till the gelatine is melted and the
precipitate mixed with it. It must be kept warm for some time, and
shaken vigorously until all granularity has disappeared, This is, of
course, ascertained by placing a drop of the emulsion on a piece of
glass, and examining it. If it be wished to keep the bromide of silver
for future use it may be placed on a piece of muslin stretched in the
drying-box, when it will dry in a very short time; and, although I
cannot speak from experience on this point, it will, I have no doubt,
keep for an indefinite time so long as light is kept from it.
If it be desired the ammonio-nitrate method may be used instead of the
boiling one, although in my hands it does not give such sensitiveness.
If it be desired to use this method, solution Nos. I, II., and IV. are
made up exactly as for the boiling method, except that No. II. is not
acidified. Liquid ammonia is then poured with stirring into the silver
solution, until it blackens and again clears. Emulsification is
performed exactly as described above, but instead of boiling, the
emulsion is kept at a temperature of about 100 deg. Fahr. for half an hour,
when it is poured into the alcohol, no addition of gelatine being
previously made.
I think I may claim for the method which I have just described that it
is less troublesome and more certain than either the ordinary washing
method or the usual one of precipitating with alcohol, while it affords
an easy method of making sensitive silver bromide in such a form that it
can be more easily stored and afterwards manipulated than if it were in
the form of pellicle. The whole of the soluble salts are eliminated,
and also any gelatine which may have been destroyed in the cooking.
The amount of alcohol used is comparatively small; in fact, to prepare
silver bromide for a pint of emulsion very little more than a pint of
methylated spirit is required. Besides this I do not think that I would
be wrong in saying that the chance of green fog is reduced to a minimum.
Let me take this opportunity of thanking Captain Abney for his prompt
reply to my question about the connection between the proportion
of bromide to gelatine in emulsions, and the density of resulting
images.--_W. K. Burton, in British Journal of Photography_.
* * * * *
[Illustration: Old Wrought Iron Gates, Guildhall.]
* * * * *
THE POTTERY AND PORCELAIN INDUSTRIES OF JAPAN.
Japanese chronicles claim that the first pottery was made in the year
660 B.C.; it was not, however, until the Christian era that the art made
any considerable advances. In the year 1223 A.D., great improvements
were made in manufacture and decoration of the ware. From that date to
the sixteenth century the great potteries of Owari, Hizen, Mino, Kioto,
Kaga, and Satsuma were established. The Rahn-Yaki, or crackled ware, was
first made at Kioto, at the commencement of the sixteenth century. The
best old Hizen ware, that which is still the most admired, was made
at Arita Hizen, in 1580 to 1585; the old Satsuma dates from 1592.
Consul-General Van Buren states that porcelain clays are found in nearly
all parts of the country, and the different kinds are usually found
in close proximity, and close to canals and rivers, which is of
considerable advantage, as affording a means of transport. In all cases
every variety of clay used in the manufacture of pottery is found in a
natural state; there is no necessity to manufacture the quartzose or
fusible clays as is done in other parts of the world, and which adds
considerably to the cost of the ware. One of the peculiarities in the
clay found in Japan is that it contains both the fusible and infusible
materials in such proportions as to make a light, beautiful,
translucent, and durable porcelain. At Arita, in Hizen, there is a clay
found which contains 783/4 per cent, of silica, and l73/4 per cent, of
alumina; from this clay is made the delicate, translucent eggshell ware,
without the addition of any other matter. From an adjoining bluff a clay
is taken which has 50 per cent, of silica, and 38 per cent, of alumina;
from this the common porcelain is made.
Potter's clay is found in very large quantities in the provinces of
Yamashiro, Hoki, Turoo Iyo, Hizen, Higo, Owari, Mikaera, Idyn, Musashi,
and Mino. In the whole of Japan there are 283 localities where the clay
is deposited; many of these only furnish inferior clays, but they are
all fitted for use in some of the various kinds of pottery. These clays
are thoroughly powdered by means of what is called "balance pounders,"
worked in some localities by water-power, but the work is often done by
hand. The powder is then dried, and stored on boards or in flat boxes.
This dough does not go through the process of fermentation. The shaping
is almost exclusively done on the potter's wheel, which is set on a
pivot working in a porcelain eye. As a rule, the wheel is turned by the
potter himself, but in Hizen it is kept in motion by means of a band
connected with its pivot and another wheel turned by a boy. In making
dishes of other shape than round, a crude mould is sometimes used. After
the clay has been shaped on the wheel, it is set away for drying, and
usually in two or three days it is considered sufficiently dry for
smoothing, which is done on the wheel with a sharp curved knife. The
material is now made into "bisque," or biscuit, by a preliminary baking
in small ovens, when it is ready for painting, if it is to be painted
on the biscuit; if not, it is ready for the glazing. In either event it
will then go to the large furnace for the final baking. The kilns for
this purpose are always built on hill sides, and are joined together,
increasing in size from the lower to the higher ones, and in number from
four to twenty five; these kilns are so constructed that the draught is
from the lowest one, in addition to which each kiln has its own firing
place. The result of this construction is that the upper ones are by
far the most heated, and the ware is arranged accordingly; that which
requires the least baking, in the lower kiln, and that which requires
the greatest heat, in the upper. These connecting kilns have the merit
of being heat saving, but they are usually small and badly constructed,
and the heat in none of them is uniform.
The glaze is made from the silicious clay and potash extracted from wood
ashes. This potash is not a pure white, and this accounts for the dirty
color usually to be observed in unpainted Japanese ware. In different
districts the painting varies. For instance, in Owari, the greater part
of the ware is painted a cobalt blue--the cobalt ore being found in the
bluffs near the clay deposits, and is used for painting the cheaper
wares, and for this purpose German cobalt is also employed. The painting
with cobalt is generally done on the biscuit before glazing. In several
districts a very handsome ware is made, and painted on the glaze. For
this kind of painting the colors are mixed with a silicate of lead
and potash, and baked the third time in a small furnace at a low
temperature. The coloring oxides in use are those of copper, cobalt,
iron, antimony, manganese, and gold. Japanese porcelain painting may be
divided into two categories, decorative and graphic; the first is used
to improve the vessel upon which it is placed, and this class includes
all the ware except that of the province of Kaga, which would come under
the head of graphic, as it delineates all the trades, occupations,
sports, customs, and costumes of the people, as well as the scenery,
flora, and fauna of the country. "Owari ware" is made in the province
of that name; it is not as translucent, but stronger and more tenacious
than some of the Hizen manufacture.
The principal potteries are at a village called Seto, twelve miles from
the sea; in this village there are more than 200 kilns. The ware is
mostly painted a cobalt blue, and is merely of a decorative kind,
consisting of branches of trees, grass, flowers, birds, and insects, all
these being copied by the artist from nature. All the Owari ware is true
hard porcelain, and is strong and durable. In Hizen, a number of wares
are manufactured, the best known kind being the "Eurari," which is made
at Arita, but painted at Eurari. The colors in use are red, blue, green,
and gold; these are combined in various proportions, but, as a rule, the
red predominates. Generally the surface of the vessel is divided into
medallions of figures, which alternately have red, blue, or white
back-ground, with figures in green or blue and gold.
The egg-shell porcelain sold at Nagasaki is made in this province from
Arita clay, and this is made from clay with no admixture of fusible
matter except that contained by the clay naturally. The province of
Satsuma is noted for crackled ware. It is only within a very few years
that large vases have been manufactured, and in earlier days the old
ware was confined to small vessels. The glaze is a silicate of alumina
and potash, and the best ware has a complete network of the finest
crackles; the painting is of birds and flowers, and noted for its
delicate lines of green, red, and gold.
In Kioto, the ware manufactured is very similar to that produced in
Satsuma, but it is lighter and more porous; the decorations are also
nearly the same, being of birds and flowers. There is a description of
ware made in Kioto, called "Eraku," the whole body of which is covered
with a red oxide of iron, and over this mythical figures of gold are
traced. That produced in Kagja is _faience_, and in the style of
painting is unlike any other in Japan, the predominating color being
a light red, used with green and gold. The designs with which it is
profusely decorated are trees, grasses, flowers, birds, and figures of
all classes of people, with their costumes, occupations, and pastimes.
The "Banko" ware is made at the head of the Owari Bay; it is an unglazed
stone-ware, very light and durable, made on moulds in irregular shapes,
and decorated with figures in relief. On the island of Awadji, a
delicate, creamy, crackled, soft paste porcelain is made. The figures
used in decoration are birds and flowers, but outlined by heavy, dark
lines.
Consul Van Buren is of opinion that, at no distant day, Japan will be
one of the foremost competitors in the pottery markets of the world,
on account of the great variety and excellence of the clays, their
proximity to the sea, the cheapness of labor, and the beauty and
originality of the decorations. Already this important industry has been
greatly stimulated by the foreign demand, and by the success of
Japanese exhibitors at the Exhibitions of Vienna, Philadelphia, and
Paris.--_Journal of the Society of Arts_.
* * * * *
Professor Julius E. Hilgard, for twenty years assistant in charge of the
office, has been placed in temporary charge of the Coast and Geodetic
Survey. It is understood that he will be appointed superintendent to
succeed the late Captain Carlile P. Patterson.
* * * * *
THE FRENCH CRYSTAL PALACE.
The first idea of the French Crystal Palace was suggested by the English
structure of the same name at Sydenham, about eight miles from London.
Such a structure, as may be readily conceived, requires a site of vast
extent, and one that shall be easy of access and possess the most
agreeable surroundings. To the promoter of the project, those portions
of the park of St. Cloud in the vicinage of the old chateau appeared to
combine within themselves all the conditions that were desirable, and
he, therefore, on the 15th of December, 1879, addressed the Ministers of
Public Works and of Finances asking for the necessary concessions. The
extensive specifications have been finally completed and will probably
be shortly submitted for the approval of the parliament. The moment has
arrived then for the public press to take cognizance of a project which
concerns so great interests.
[Illustration: THE FRENCH CRYSTAL PALACE--PARK OF ST CLOUD, PARIS.]
At present we shall say a few words _a propos_ of the engraving we
present herewith. The French Crystal Palace will consist of one great
nave, two lateral naves, two surrounding galleries, and a vast rotunda
behind. The principal entrance, located at the head of the avenue
leading from the present ruins (which will, ere long, be transformed
into a most interesting museum), will exhibit a very striking aspect
with its monumental fountain and the dome which it is proposed to erect
over the very entrance itself. The whole structure will cover about
nineteen acres of ground, thus being two and a half times the extent of
the Palace of Industry in the Champs Elysees. The great nave of honor
will be nearly 1,650 ft. in length, 78 ft. in width, and 98 ft. in
height. The dome will measure exactly 328 ft. in height, or 105 ft. more
than the towers of Notre Dame. The structure, with the exception of
basement and foundation, will be of glass and iron.
The project which we publish to-day has been studied and gotten up,
according to the general plans and dimensions suggested by the promoter,
by Mr. Dumoulin, the architect. We are informed that the builder is to
be Mr. Alfred Hunnebelle, a contractor well known from the extensive
works that he has executed, and who is president of the Syndical Chamber
of Contractors of Paris.
Among the annexes of this palace we may note a "Palace of the Republic,"
to be built on the ruins and designed for illustrious or distinguished
visitors, such as the President of the Republic, the Ministers, the
Municipal Council of Paris, foreign delegates, etc.; a farm house for
special exhibitions and a field for experiments; galleries, cottages,
etc.
As for the programme, which embraces six divisions and numerous
subdivisions, we are unable to give it at present for want of space; we
need only say that it satisfies perfectly all the conditions of so vast
an undertaking.
In the hands of the projector, Mr. Nicole, who is well known from his
long experience in such matters, the exhibition will undoubtedly prove
a success and be instrumental in adding prosperity to all French
industries.
* * * * *
THE GREAT HEAT OF THE SUN.--Prof. S. P. Langley has made the following
calculation: A sunbeam one centimeter in section is found in the clear
sky of the Alleghany Mountains to bring to the earth in one minute
enough heat to warm one gramme of water by 1 deg. C. It would, therefore,
if concentrated upon a film of water 1/500th of a millimeter thick,
1 millimeter wide, and 10 millimeters long, raise it 83 1/3 deg. in one
second, provided all the heat could be maintained. And since the
specific heat of platinum is only 0.0032 a strip of platinum of the same
dimensions would, on a similar supposition, be warmed _in one second_ to
2,603 deg. C.--a temperature sufficient to melt it!
* * * * *
CHATEAU IN THE AEGEAN SEA.
From the site of this building, magnificent views are obtained over the
island-dotted sea and the mainland of Asia Minor: but, "though every
prospect pleases," it is a land of earthquakes, and unfortunately, the
works at the chateau have been suspended, owing to the dreadful calamity
which has recently fallen upon the district. The building is intended
for the residence of an English lady of exalted rank. It is to be built
of local white stone, the hall, staircase, etc., being lined and paved
with marbles. The hall is a large apartment about 25 ft. high, with
paneled ceiling, having galleries on two sides, giving access to the
rooms surrounding it on first floor, and to the turret staircase leading
to roofs, etc. With the exception of sanitary apparatus, painted
windows, etc. (which will be supplied by English firms), the whole of
the work will be executed by native labor. The architect is Mr. Edwin T.
Hall, London.--_Building News_.
[Illustration: SUGGESTIONS IN ARCHITECTURE--A CASTELLATED CHATEAU.]
* * * * *
ELECTRIC POWER.
Just now nothing save electricity is talked about in scientific circles.
During the meeting of the British Association the greatest possible
prominence was given to electrical questions and propositions The
success of the electric light, the introduction of the Faure battery
with a great flourish of trumpets, and the magnificent display of
electrical instruments and machinery at Paris, have all operated to the
same end. The daily press has taken the subject up, and journals which
were nothing hitherto if not political, now indulge in magnificent
rhapsodies concerning the future of electricity. Even eminent engineers,
carried away by the intoxication of the moment, have not hesitated to
say that the steam engine is doomed, and that its place will be taken by
the electricity engine. In the midst of all this noise and clamor and
blowing of personal trumpets, it is not easy to keep one's head clear,
and mistakes may be made which will cause disappointment to many and
retard the progress of electrical science. We confidently expect that
electricity will prove a potent agent by and by in the hands of the
speculator for extracting gold from the pockets of the public, and we
write now to warn our readers in time, and to endeavor to clear the air
of some of the mists with which it is obscured. There is, no doubt,
a great future before electricity; but it is equally certain that
electricity can never do many things which the half informed may be
readily made to believe it will do. We propose here to say enough
on this point to enlighten our readers, without troubling them with
perplexing problems and speculations.
No one at this moment knows what electricity is; but for our present
purpose we may regard it as a fluid, non-elastic, and without weight,
and universally diffused through the universe. To judge by recently
published statements, a large section of the reading public are taught
that this fluid is a source of power, and that it may be made to do the
work of coal. This is a delusion. So long as electricity remains in what
we may call a normal state of repose, it is inert. Before _we can get
any work out of electricity a somewhat greater amount of work must be
done upon it_. If this fundamental and most important truth be kept in
view it will not be easy to make a grave mistake in estimating the value
of any of the numerous schemes for making electricity do work which will
ere long be brought before the public. To render our meaning clearer,
we may explain that in producing the electric light, for instance, a
certain quantity of electricity passes in through one wire to the lamp,
and precisely the same quantity passes out through the other wire, and
on to the earth or return wire completing the circuit. Not only is the
quantity the same, the velocity is also unchanged. But in going through
the lamp the current has done something. It has overcome the resistance
of the carbons, heated them to a dazzling white heat, and so performed
work. In doing this the current of electricity has lost something. Led
from the first lamp to a second, it is found powerless--if the first
lamp be of sufficient size. What is it that the electricity has lost?
It has parted with what electricians would term "potential," or the
capacity for performing work. What this is precisely, or in what way the
presence or absence of potential modifies the nature of the electric
current, no one knows; but it is known that this potential can only be
conferred on electricity by doing work on the electricity in the first
instance. The analogy between electricity and a liquid like water will
now be recognized. So long as the water is at rest, it is inert. If we
pump it up to a height, we confer on it the equivalent of potential.
We can let the water fall into the buckets of an overshot wheel. Its
velocity leaving the tail race may be identical with that at which it
left the supply trough to descend on the wheel. Its quantity will be
the same. It will be in all respects unchanged, just as the current
of electricity passing through a lamp is unchanged; but it has,
nevertheless, lost something. It has parted with its potential--capacity
for doing work--and it becomes once more inert. But the duty which it
discharged in turning the mill wheel was somewhat less than the precise
equivalent of the work done in pumping it up to a level with the top of
the wheel. In the same way the electric current never can do work equal
in amount to the work done on it in endowing it with potential.
It will thus be seen that electricity can only be used as a means of
transmitting power from one place to another, or for storing power up
at one time to be used at a subsequent period; but it cannot be used to
originate power in the way coal can be used. It possesses no inherent
potential. It is incapable of performing work unless something is done
to it first. We have spoken of it as a fluid, but only for the sake of
illustration. As we have said, no one knows what it is, but the theory
which bids fair for acceptance is that it is a mode of motion of the
all-pervading ether. Very curious and instructive experiments are now
being carried out in Paris by Dr. Bjerkness, of Christiania, in the
Norwegian section of the electrical exhibition. This gentleman submerges
thin elastic diaphragms in water, and causes them to vibrate, or rather
pulsate, by compressed air. He finds that if they pulsate synchronously
they attract each other. If the pulsations are not simultaneous, the
disks repel each other. From this and other results he has obtained,
it may be argued that the ether plays the part of the water in Dr.
Bjerkness' tank, and that when special forms of vibration are set up
in bodies they become competent to attract or repel other bodies. This
being so, it will be seen that the power of attraction or repulsion of
an electrical body depends in the first instance on the motion set up
in the body attracted or repulsed, and this motion is, of course, some
function of the work originally done on the body. We need not pursue
this argument further. Among the most scientific investigators of the
day it is admitted that the efficiency of electricity as a doer of work,
or a producer of action at a distance, must depend for its value on the
performance of work in some one way or another on the electricity itself
in the first instance. It may be worth while here to dispel a popular
delusion. It is held very generally that electricity can be made, as,
for instance, by the galvanic battery. There is no reason to believe
anything of the kind; but whether it is or is not true that electricity
is actually made by the combustion of zinc in a galvanic trough, it is
quite certain that this electricity, unless it possesses potential, can
do no work, no matter how great its quantity. Of course, it is to be
understood that all electric currents possess potential. If they did
not, their presence would be unknown; but the potential of a current
is in all cases the result of work done on electricity, either by the
oxidation of zinc, or in some other way. This is a broad principle, but
it is strictly consistent in every respect with the truth. Electricity,
then, is, as we have said, totally different from coal; and it can never
become a substitute for it alone. Water power, air power, or what we
may, for want of a better phrase, call chemical power, combined with
electricity, can be used as a substitute for coal; but electricity
cannot of itself be employed to do work. It is true, however, that
electricity, on which work has already been done, may be found in
nature. Atmospheric electricity, for example, may perhaps yet be
utilized. It is by no means inconceivable that the electricity contained
in a thunder cloud might be employed to charge a Faure battery; but up
to the present no one has contemplated the obtaining of power from the
clouds, and whether it is or is not practicable to utilize a great
natural force in this way does not affect our statement. The use of
electricity must be confined to its power of transmitting or storing up
energy, and this truth being recognized, it becomes easy to estimate the
future prospects of electricity at something like their proper value.
It has been proved to a certain extent that electricity can be used to
transmit power to a distance, and that it can be used to store it up.
Thus far the man of pure science. The engineer now comes on the stage
and asks--Can practical difficulties be got over? Can it be made to pay?
In trying to answer these questions we cannot do better than deal with
one or two definite proposals which have been recently made. That with
which we shall first concern ourselves is that trains should be worked
by Faure batteries instead of by steam. It is suggested that each
carriage of a train should be provided with a dynamo motor, and that
batteries enough should be carried by each to drive the wheels, and so
propel the train. Let us see how such a scheme would comply with working
conditions. Let us take for example a train of fifteen coaches on the
Great Northern Railway, running without a stop to Peterborough in one
hour and forty minutes. The power required would be about 500 horses
indicated. To supply this for 100 minutes, even on the most absurdly
favorable hypothesis, no less than 25 tons of Faure batteries would be
required. Adding to these the weight of the dynamo motors, and that
unavoidably added to the coaches, it will be seen that a weight equal to
that of an engine would soon be reached. The only possible saving would
be some 28 to 30 tons of tender. In return for this all the passengers
would have to change coaches at Peterborough, as the train could not be
delayed to replace the expended with fresh batteries. This is out of
the question. The Faure batteries must all be carried on one vehicle or
engine, which could be changed for another, like a locomotive. Even then
no advantage would be gained. As to cost, it is very unlikely that the
stationary engines which must be provided to drive the dynamo machines
for charging the batteries would be more economical than locomotive
engines; and if we allow that the dynamo machine only wasted 10 per
cent. of the power of the engine, the Faure batteries 10 per cent. of
the power of the dynamo machines, and the dynamo motors 10 per cent. of
the power of the batteries--all ridiculously favorable assumptions--yet
the stationary engines would be handicapped with a difference in net
efficiency between themselves and the locomotive--admitting the original
efficiency per pound of coal in both to be the same--of some 27 per
cent., we think we may relegate this scheme to the realms of oblivion.
Another idea is that by putting up turbines and dynamo machines the
steam engine might be superseded by water power. Now it so happens that
if all the water power of England were quadrupled it would not nearly
suffice for our wants. It may be found worth while perhaps to construct
steam engines close to coalpits and send out power from these engines by
wire; but the question will be asked, Which is the cheaper of the two,
to send the coal or to send the power? On the answer to this will
depend the decision of the mill owners. Another favorite scheme is that
embodied in the Siemens electrical railway. We believe that there is a
great future in store for electricity as a worker of tramway traffic;
but the traffic on a great line like the Midland or Great Northern
Railway could not be carried on by it. As Robert Stephenson said of the
atmospheric system, it is not flexible enough. The working of points
and crossings, and the shunting of trains and wagons, would present
unsurmountable difficulties. We have cited proposals enough, we think,
to illustrate our meaning. Sir William Armstrong, Sir Frederick
Bramwell, Dr. Siemens, Sir W. Thomson, and many others may be excused if
they are a little enthusiastic. They are just now overjoyed with success
attained; but when the time comes for sober reflection they will, no
doubt, see good reason to moderate their views. No one can say, of
course, what further discoveries may bring to light; but recent speakers
and writers have found in what is known already, materials for sketching
out a romance of electricity. It is but romancing to assert that the end
of the steam engine is at hand. Wonderful and mystical as electricity
is, there are some very hard and dry facts about it, and these facts are
all opposed to the theory that it can become man's servant of all work.
Ariel-like, electricity may put a girdle round the earth in forty
minutes; but it shows no great aptitude for superseding the useful old
giant steam, who has toiled for the world so long and to such good
purpose--_The Engineer_.
* * * * *
ON A METHOD OF OBTAINING AND MEASURING VERY HIGH VACUA WITH A MODIFIED
FORM OF SPRENGEL-PUMP.
By Ogden N. Rood, Professor of Physics in Columbia College.
In the July number of this Journal for 1880, I gave a short account of
certain changes in the Sprengel-pump by means of which far better vacua
could be obtained than had been previously possible. For example, the
highest vacuum at that time known had been reached by Mr. Crookes, and
was about 1/17,000,000, while with my arrangement vacua of 1/100,000,000
were easily reached. In a notice that appeared in _Nature_ for August,
1880, p. 375, it was stated that my improvements were not new, but had
already been made in England four years previously. I have been unable
to obtain a printed account of the English improvements, and am willing
to assume that they are identical with my own; but on the other hand,
as for four years no particular result seems to have followed their
introduction in England, I am reluctantly forced to the conclusion that
their inventor and his customers, for that period of time, have remained
quite in ignorance of the proper mode of utilizing them. Since then I
have pushed the matter still farther, and have succeeded in obtaining
with my apparatus vacua as high as 1/390,000,000 without finding
that the limit of its action had been reached. The pump is simple in
construction, inexpensive, and, as I have proved by a large number of
experiments, certain in action and easy of use; stopcocks and grease are
dispensed with, and when the presence of a stopcock is really desirable
its place is supplied by a movable column of mercury.
_Reservoir_.--An ordinary inverted bell-glass with a diameter of 100 mm.
and a total height of 205 mm. forms the reservoir; its mouth is closed
by a well-fitting cork through which passes the glass tube that forms
one termination of the pump. The cork around tube and up to the edge of
the former is painted with a flexible cement. The tube projects 40 mm.
into the mercury and passes through a little watch-glass-shaped piece of
sheet-iron, W, figure 1, which prevents the small air bubbles that creep
upward along the tube from reaching its open end; the little cup is
firmly cemented in its place. The flow of the mercury is regulated
by the steel rod and cylinder, CR, Figure 1. The bottom of the steel
cylinder is filled out with a circular piece of pure India-rubber,
properly cemented; this soon fits itself to the use required and answers
admirably. The pressure of the cylinder on the end of the tube is
regulated by the lever, S, Figure 1; this is attached to a circular
board which again is firmly fastened over the open end of the
bell-glass. It will be noticed that on turning the milled head, S, the
motion of the steel cylinder is not directly vertical, but that it tends
to describe a circle with c as a center; the necessary play of the
cylinder is, however, so small, that practically the experimenter does
not become aware of this theoretical defect, so that the arrangement
really gives entire satisfaction, and after it has been in use for a few
days accurately controls the flow of the mercury. The glass cylinder is
held in position, but not supported, by two wooden _adjustable_ clamps,
_a a_, Figure 2. The weight of the cylinder and mercury is supported by
a shelf, S, Figure 2, on which rests the cork of the cylinder; in this
way all danger of a very disagreeable accident is avoided.
[Illustration: MODIFIED FORM OF SPRENGEL PUMP.]
_Vacuum-bulb_.--Leaving the reservoir, the mercury enters the
vacuum-bulb, B, Figure 2, where it parts with most of its air and
moisture; this bulb also serves to catch the air that creeps into the
pump from the reservoir, even when there is no flow of mercury; its
diameter is 27 mm. The shape and inclination of the tube attached to
this bulb is by no means a matter of indifference; accordingly Figure
3 is a separate drawing of it; the tube should be so bent that a
horizontal line drawn from the proper level of the mercury in the bulb
passes through the point, _o_, where the drops of mercury break off. The
length of the tube, EC, should be 150 mm., that of the tube, ED, 45 mm.;
the bore of this tube is about the same as that of the fall-tube.
_Fall-tube and bends_.--The bore of the fall-tube in the pump now used
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