TO MAKE A HAT PIN
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.
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.