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 298
ut its way out of the hole. Fig. 335, although never used with the drill-bow, nor of so smalla size as in the wood-cut, is added to show how completely the drillproper for iron, follows the character of the turning tools for thatmetal; the flute or hollow filed behind the edge, gives the… … Care should always be taken to have a proportional degree ofstrength in the shafts of the drills, otherwise they tremble and chat-ter when at work, or they occasionally twist off in the neck; thepoint should be also ground exactly central, so that both edges maycut. As a guide for the proportional…
Metal-work · Electrometallurgy · Metallurgy
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