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Manufacturing

Of Copying With Altered Dimensions
147. Of the pentagraph. This mode of copying is chiefly used ...

Registering Operations
65. One great advantage which we may derive from machinery is...

On The Influence Of Durability On Price
197. Having now considered the circumstances that modify what...

On Combinations Amongst Masters Or Workmen Against Each Other
353. There exist amongst the workmen of almost all classes, ...

On The Cost Of Each Separate Process In A Manufacture
253. The great competition introduced by machinery, and the ...

Of Copying By Stamping
128. This mode of copying is extensively employed in the art...

Sources Of The Advantages Arising From Machinery And Manufactures
1. There exists, perhaps, no single circumstance which disti...

On Over Manufacturing
284. One of the natural and almost inevitable consequences of...

Enquiries Previous To Commencing Any Manufactory
298. There are many enquiries which ought always to be made ...

Exerting Forces Too Great For Human Power And Executing Operations Too Delicate For Human Touch
56. It requires some skill and a considerable apparatus to e...

On The Effect Of Machinery In Reducing The Demand For Labour
404. One of the objections most frequently urged against mac...

Of Price As Measured By Money
201. The money price at which an article sells furnishes us ...

Of Raw Materials
210. Although the cost of any article may be reduced in its ...

On Combinations Of Masters Against The Public
376. A species of combination occasionally takes place among...

On The Influence Of Verification On Price
181. The money price of an article at any given period is us...

Of Copying By Moulding
112. This method of producing multitudes of individuals havi...

On The Duration Of Machinery
340. The time during which a machine will continue to perform...

On Contriving Machinery
318. The power of inventing mechanical contrivances, and of ...

On The Exportation Of Machinery
437. A few years only have elapsed, since our workmen were n...

Economy Of The Materials Employed
77. The precision with which all operations by machinery are ...



Of Copying By Stamping








128. This mode of copying is extensively employed in the
arts. It is generally executed by means of large presses worked
with a screw and heavy flywheel. The materials on which the
copies are impressed are most frequently metals, and the process
is sometimes executed when they are hot, and in one case when the
metal is in a state between solidity and fluidity.

129. Coins and medals. The whole of the coins which circulate
as money are produced by this mode of copying. The screw presses
are either worked by manual labour, by water, or by steam power.
The mint which was sent a few years since to Calcutta was capable
of coining 200,000 pieces a day. Medals, which usually have their
figures in higher relief than coins, are produced by similar
means; but a single blow is rarely sufficient to bring them to
perfection, and the compression of the metal which arises from
the first blow renders it too hard to receive many subsequent
blows without injury to the die. It is therefore, after being
struck, removed to a furnace, in which it is carefully heated
red-hot and annealed, after which operation it is again placed
between the dies, and receives additional blows. For medals, on
which the figures are very prominent, these processes must be
repeated many times. One of the largest medals hitherto struck
underwent them nearly a hundred times before it was completed.

130. Ornaments for military accoutrements, and furniture.
These are usually of brass, and are stamped up out of solid or
sheet brass by placing it between dies, and allowing a heavy
weight to drop upon the upper die from a height of from five to
fifteen feet.

131. Buttons and nail heads. Buttons embossed with crests or
other devices are produced by the same means; and some of those
which are plain receive their hemispherical form from the dies in
which they are struck. The heads of several kinds of nails which
are portions of spheres, or polyhedrons, are also formed by these
means.

132. Of a process for copying, called in France clichee. This
curious method of copying by stamping is applied to medals, and
in some cases to forming stereotype plates. There exists a range
of temperature previous to the melting point of several of the
alloys of lead, tin, and antimony, in which the compound is
neither solid, nor yet fluid. In this kind of pasty state it is
placed in a box under a die, which descends upon it with
considerable force. The blow drives the metal into the finest
lines of the die, and the coldness of the latter immediately
solidifies the whole mass. A quantity of the half-melted metal is
scattered in all directions by the blow, and is retained by the
sides of the box in which the process is carried on. The work
thus produced is admirable for its sharpness, but has not the
finished form of a piece just leaving the coining-press: the
sides are ragged, and it must be trimmed, and its thickness
equalized in the lathe.





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