Printing : a practical treatise on the art of typography as applied more particularly to the printing of books (1904)
Jacobi, Charles Thomas · London : G. Bell & Sons · leaf 31
Fig. 2. MATRIX. 4 PKINTING was made of wood and lined with iron. Each size of bodyrequired a different mould, but the precise width could beregulated according to the thickness of letter to be cast. … Fig. 3. hand-mould (opened). This operation of casting, though apparently a simple one,required experience and judgement, so that the mould might
