The practical metal-worker's assistant : containing the arts of working all metals and alloys, forging of iron and steel, hardening and tempering, melting and mixing, casting and founding, works in sheet metal, the processes dependent on the ductility of the metals, soldering, and the most improved processes, and tools employed by metal-workers, with the application of the art of electro-metallurgy to manufacturing processes : collected from original sources, and from the works of Holtzapffel, Bergeron, Leupold, Plumier, Napier, and others ... (1851)
Byrne, Oliver · Philadelphia : H.C. Baird · leaf 275
edges to fall on one plane; so that one blow effects thetwo incisions, and the punches may then be separated for the re-moval of the work, should it stick fast between the two parts of theinstrument. Punches of irregular and arbitrary forms, used for cutting outpaper, the leaves for artificial… … solid, or without the loose ring. These irregular punches are, how-ever, much more tedious to make than the circular, which admit ofbeing fashioned in the lathe. Figured punches of much larger dimensions have been of lateused for cutting out the variously formed papers used in makingenvelopes for…
Metal-work · Electrometallurgy · Metallurgy
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