It is highly ingenious in point of contrivance, and, in
respect to its economical principles, will furnish a strong and
interesting contrast with the manufacture of pins by the human
hand. In this machine a coil of brass wire is placed on an axis;
one end of this wire is drawn by a pair of rollers through a
small hole in a plate of steel, and is held there by a forceps.
As soon as the machine is put in action, -
1. The forceps draws the wire on to a distance equal in
length to one pin: a cutting edge of steel then descends close to
the hole through which the wire entered, and severs the piece
drawn out.
2. The forceps holding the piece thus separated moves on,
till it brings the wire to the centre of the chuck of a small
lathe, which opens to receive it. Whilst the forceps is returning
to fetch another piece of wire, the lathe revolves rapidly, and
grinds the projecting end of the wire upon a steel mill, which
advances towards it.
3. After this first or coarse pointing, the lathe stops, and
another forceps takes hold of the half-pointed pin, (which is
instantly released by the opening of the chuck), and conveys it
to a similar chuck of an adjacent lathe, which receives it, and
finishes the pointing on a finer steel mill.
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