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Manufacturing

Printing From Surface
91. This second department of printing is of more frequent a...

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

Increase And Diminution Of Velocity
32. The fatigue produced on the muscles of the human frame d...

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

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

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

On The Method Of Observing Manufacturies
160. Having now reviewed the mechanical principles which reg...

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

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

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

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

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

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...

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

Extending The Time Of Action Of Forces
45. This is one of the most common and most useful of the em...

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

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

Regulating Power
27. Uniformity and steadiness in the rate at which machinery ...

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

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



Copying With Elongation








140. In this species of copying there exists but little
resemblance between the copy and the original. It is the
cross-section only of the thing produced which is similar to the
tool through which it passes. When the substances to be operated
upon are hard, they must frequently pass in succession through
several holes, and it is in some cases necessary to anneal them
at intervals.

141. Wire drawing. The metal to be converted into wire is
made of a cylindrical form, and drawn forcibly through circular
holes in plates of steel: at each passage it becomes smaller.
and, when finished, its section at any point is a precise copy of
the last hole through which it passed. Upon the larger kinds of
wire, fine lines may sometimes be traced, running longitudinally.
these arise from slight imperfections in the holes of the
draw-plates. For many purposes of the arts, wire, the section of
which is square or half round, is required: the same method of
making it is pursued, except that the holes through which it is
drawn are in such cases themselves square, or half-round, or of
whatever other form the wire is required to be. A species of wire
is made, the section of which resembles a star with from six to
twelve rays; this is called pinion wire, and is used by the
clockmakers. They file away all the rays from a short piece,
except from about half an inch near one end: this becomes a
pinion for a clock; and the leaves or teeth are already burnished
and finished, from having passed through the draw-plate.

142. Tube drawing. The art of forming tubes of uniform
diameter is nearly similar in its mode of execution to wire
drawing. The sheet brass is bent round and soldered so as to form
a hollow cylinder; and if the diameter outside is that which is
required to be uniform, it is drawn through a succession of
holes, as in wire drawing: If the inside diameter is to be
uniform, a succession of steel cylinders, called triblets, are
drawn through the brass tube. In making tubes for telescopes, it
is necessary that both the inside and outside should be uniform.
A steel triblet, therefore, is first passed into the tube, which
is then drawn through a succession of holes, until the outside
diameter is reduced to the required size. The metal of which the
tube is formed is condensed between these holes and the steel
cylinder within; and when the latter is withdrawn the internal
surface appears polished. The brass tube is considerably extended
by this process, sometimes even to double its first length.

143. Leaden pipes. Leaden pipes for the conveyance of water
were formerly made by casting; but it has been found that they
can be made both cheaper and better by drawing them through holes
in the manner last described. A cylinder of lead, of five or six
inches in diameter and about two feet long, is cast with a small
hole through its axis, and an iron triblet of about fifteen feet
in length is forced into the hole. It is then drawn through a
series of holes, until the lead is extended upon the triblet from
one end to the other, and is of the proper thickness in
proportion to the size of the pipe.

144. Iron rolling. When cylinders of iron of greater
thickness than wire are required, they are formed by passing
wrought iron between rollers, each of which has sunk in it a
semi-cylindrical groove; and as such rollers rarely touch
accurately, a longitudinal line will usually be observed in the
cylinders so manufactured. Bar iron is thus shaped into all the
various forms of round, square, half-round, oval, etc. in which
it occurs in commerce. A particular species of moulding is thus
made, which resembles, in its section, that part of the frame of
a window which separates two adjacent panes of glass. Being much
stronger than wood, it can be considerably reduced in thickness,
and consequently offers less obstruction to the light; it is much
used for skylights.

145. It is sometimes required that the iron thus produced
should not be of uniform thickness throughout. This is the case
in bars for railroads, where greater depth is required towards
the middle of the rail which is at the greatest distance from the
supports. This form is produced by cutting the groove in the
rollers deeper at those parts where additional strength is
required, so that the hollow which surrounds the roller would, if
it could be unwound, be a mould of the shape the iron is intended
to fit.

146. Vermicelli. The various forms into which this paste is
made are given by forcing it through holes in tin plate. It
passes through them, and appears on the other side in long
strings. The cook makes use of the same method in preparing
butter and ornamental pastry for the table, and the confectioner
in forming cylindrical lozenges of various composition.





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