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 449
447 SCREW-CUTTING TOOLS. become an exact copy of the guide-screw contained in the slide- rest, that is, as regards the interval between its several threads, its total length, and its general perfection. Fig. 494. … But the arrows in M and S denote that adjoining wheels always travel in opposite directions ; when, therefore, the mandrel and slide-rest are connected by only one pair of wheels, as in Fig. 494, the direction of the copy screw is the reverse of that of the guide. The right-hand screw being far…
Metal-work · Electrometallurgy · Metallurgy
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
