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Manufacturing

Of The Identity Of The Work When It Is Of The Same Kind And Its Accuracy When Of Different Kinds
79. Nothing is more remarkable, and yet less unexpected, than...

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

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

On The Future Prospects Of Manufactures As Connected With Science
453. In reviewing the various processes offered as illustrat...

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

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

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

On The Division Of Labour
241. We have already mentioned what may, perhaps, appear par...

Of Copying
82. The two last-mentioned sources of excellence in the work ...

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

Saving Time In Natural Operations
47. The process of tanning will furnish us with a striking i...

Of Money As A Medium Of Exchange
166. In the earlier stages of societies the interchange of t...

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

Of Copying By Punching
133. This mode of copying consists in driving a steel punch ...

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

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

On The Effect Of Taxes And Of Legal Restrictions Upon Manufactures
414. As soon as a tax is put upon any article, the ingenuity ...

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

Accumulating Power
20. Whenever the work to be done requires more force for its ...



Of Copying By Punching








133. This mode of copying consists in driving a steel punch
through the substance to be cut, either by a blow or by pressure.
In some cases the object is to copy the aperture, and the
substance separated from the plate is rejected; in other cases
the small pieces cut out are the objects of the workman's labour.

134. Punching iron plate for boilers. The steel punch used
for this purpose is from three-eighths to three-quarters of an
inch in diameter, and drives out a circular disk from a plate of
iron from one-quarter to five eighths of an inch thick.

135. Punching tinned iron. The ornamental patterns of open
work which decorate the tinned and japanned wares in general use,
are rarely punched by the workman who makes them. In London the
art of punching out these patterns in screw-presses is carried on
as a separate trade; and large quantities of sheet tin are thus
perforated for cullenders, wine-strainers, borders of waiters,
and other similar purposes. The perfection and the precision to
which the art has been carried are remarkable. Sheets of copper,
too, are punched with small holes about the hundredth of an inch
in diameter, in such multitudes that more of the sheet metal is
removed than remains behind; and plates of tin have been
perforated with above three thousand holes in each square inch.

136. The inlaid plates of brass and rosewood, called buhl
work, which ornament our furniture, are, in some instances,
formed by punching; but in this case, both the parts cut out, and
those which remain, are in many cases employed. In the remaining
illustrations of the art of copying by punching, the part made
use of is that which is punched out.

137. Cards for guns. The substitution of a circular disk of
thin card instead of paper, for retaining in its place the charge
of a fowling-piece, is attended with considerable advantage. It
would, however, be of little avail, unless an easy method was
contrived of producing an unlimited number of cards, each exactly
fitting the bore of the barrel. The small steel tool used for
this purpose cuts out innumerable circles similar to its cutting
end, each of which precisely fills the barrel for which it was
designed.

138. Ornaments of gilt paper. The golden stars, leaves, and
other devices, sold in shops for the purpose of ornamenting
articles made of paper and pasteboard, and other fancy works, are
cut by punches of various forms out of sheets of gilt paper.

139. Steel chains. The chain used in connecting the
mainspring and fusee in watches and clocks, is composed of small
pieces of sheet steel, and it is of great importance that each of
these pieces should be of exactly the same size. The links are of
two sorts; one of them consisting of a single oblong piece of
steel with two holes in it, and the other formed by connecting
two of the same pieces of steel, placed parallel to each other,
and at a small distance apart, by two rivets. The two kinds of
links occur alternately in the chain: each end of the single
pieces being placed between the ends of two others, and connected
with them by a rivet passing through all three. If the rivet
holes in the pieces for the double links are not precisely at
equal distances, the chain will not be straight, and will,
consequently, be unfit for its purpose.





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