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The practical metal-worker's assistant : comprising metallurgic chemistry, 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, Scoffern, Clay, Fairbairn, and others (1872)

Byrne, Oliver · Philadelphia : H.C. Baird · leaf 237

An illustration from The practical metal-worker's assistant : comprising metallurgic chemistry, 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, Scoffern, Clay, Fairbairn, and others, 1872, leaf 237
ies only of this art, will be therefore noticed. Each complete set of types consists of five alphabets, A, A, a, A, a, besides many other characters, in all about two hun¬ dred, and which are required to be most strictly alike in every respect, except in device and width ; the width is the greatest… … If the moulds for the rectangular shafts of the types were made as in Figs. 134 or 135, the usual forms of square moulds, they would not admit of alteration in width, as shifting a, Fig. 134, would produce no change, and Fig. 135 would thereby produce the form b. The mould which is used is made in…

Metal-work · Electrometallurgy · Metallurgy

Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.

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