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 426
n the lathe ; after which either the four or three plane surfaces were filed upon it, as shown by the section at s ; the neck from / to g was as small as the bottom of the thread, and the tang from g to h was either square or rectangular for the tap wrench. The tang, if square, was also taper, the… … In the modern thoroughfare taps for nuts, drawn to the same scale in Fig. 445, the thread is left cylindrical, from the screw tool or the dies ; then from a to b, or about one diameter in length, is turned down cylindrical until the thread is nearly obliterated ; from dtof also nearly one diameter…
Metal-work · Electrometallurgy · Metallurgy
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
