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 326
ween every set of pins, and fixed close down to the board, is a straight wire about three times the diameter of one to be straightened: very great importance is attached to this latter or central wire ; being itself straight, it serves as a metallic bed for the small wire to run upon, and it… … The pins are equivalent to the three forces a, b, c, of the bend¬ ing-machine, page 289, several times referred to. Were the first tnree pins critically placed, they would suffice to bend the wire to the limit of its permanently elastic force, and would leave it perfectly
Metal-work · Electrometallurgy · Metallurgy
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
