For this problem 12-gauge copper will be needed. The operations
required are cutting out, sawing, and soft soldering. After the
necessary stock has been cut to the required shape and the edges filed,
the design is outlined, pasted on, sawed, and finished as before. It is
desirable to grind with the Scotch stone and water to a good polish.
The head will then be ready to be attached to the pin.
[Illustration: The hat pin]
Carefully scrape with a knife the portions of the surface where the pin
is to be attached (shown in the drawing), select a steel pin of desired
length, scrape the surface of the little disk attached to one end of
it, apply to this disk a little soldering paste by means of a small
stick, and then, with a gas (or alcohol) blowpipe, melt on a bit of
soft solder, which should cover the whole disk. Now place the copper,
outside face down, on an asbestos pad, applying the soldering paste
to the central portion, place the disk with its bit of solder on this
portion of the copper, and fuse as before.
When the copper has cooled, clean off the oxide, which will have
formed, by dipping in diluted sulphuric acid, and polish on the buffing
wheel.