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 323
Figs. 387. 388. 389. 390. … cut, and screwed fast; this tooth secures the lead, and causes everyfollowing thread to be a repetition of the first; and though it mightdo without, yet this is a satisfactory security. In cutting ordinary screws, the dies shown separately in Figs.387 to 390, the consideration of which is for the…
Metal-work · Electrometallurgy · Metallurgy
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