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 297
fthe hole. Fig. 328, with two circular chamfers, bores cast-iron morerapidly than any other reciprocating drill, but it requires an entryto be first made with a pointed drill; by some, this kind is also pre-ferred for wrought iron and steel. The flat ended drill, Fig. 329, isused for flattening the… … Fig. 331 is also a double cutting drill; the cylindrical wire is filedto the diametrical line, and the end is formed with two facets. Thistool has the advantage of retaining the same diameter when it issharpened; it is sometimes called the Swiss drill, and was employedby M. Le Riviere, for making…
Metal-work · Electrometallurgy · Metallurgy
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