After you have drawn the design on the sheet of metal either with a pencil or by means of transfer paper you can begin to trace the design by punching it with the straight and curved edge chisels.

To hold a chisel right, grip it between your thumb and index finger, let your next, or medius, finger lie gently on the shank of the tool and your third, or annularis, finger rest on the sheet of metal as shown at C in Fig. 35.

The handle of the hammer is long, thin and springy and you hold it by the end with your index finger laying on it as shown at A in Fig. 35. Do not strike the tool hard or the punch may go clear through the metal sheet but instead give it a succession of light, gentle taps at the rate of about 100 a minute or so and you will make the tracing nice and even.

29 This is very fine plaster and can be bought of any dentist.