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 311
teeth like a coui-tersink ; the rose-bit, when it has plenty of oil, and but very littleto remove, will be found to act beautifully, but this tool is less itfor cast-iron than the bit next to be described. The rose-bit may l>eused without oil for the hard woods and ivory, in which it makes avery… … 368. The drill, Fig. 366, is much employed, but especially for cast-innwork; the end of the blade is made very nearly parallel, the tvofront corners are ground slightly rounding, and are chamfered, thechamfer is continued at a reduced angle along the two sides, to theextent of about two diameters…
Metal-work · Electrometallurgy · Metallurgy
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