In cutting moulds for stone from a full-size drawing, the latter or a tracing is placed over a sheet of thin zinc (No. 9 is a useful gauge), and the profile pricked through with a fine-pointed steel scriber. The zinc is then cut to shape with a pair of tinman's shears, or cut with a small hammer aud chisel on an iron plate, as neat- to the line as possible, and afterwards carefully filed to the required form. A long cornered chisel with a V cutting end will cut the straight edges of the mould better than the shears; by drawing the tool over the same line a few times, aud bending the zinc backwards and forwards, it readily breaks off, and a few touches of the file are all that is necessary to give it a true edge.