Peter Schoeffer, who had been Faust's apprentice, as their assistant. Faust is supposed to have employed himself in cutting the type, which is an extremely slow process, till Peter Schoeffer, afterward his son-in-law, suggested an improved mode of casting it in copper matrices struck by steel punches, pretty much in the same manner as was till recently practised throughout Europe. The firm had for some time previously adopted a method of casting type in moulds of plaster, which was a tedious process, as every letter required a new mould.