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 307
piece serving as the screwed nut, is a loop terminating inthe centre point. The increased length of the lever gives muchgreater purchase than in the crank formed brace, and in additionthe lever-brace may be applied close against a surface where the 302 DRILLS. crank-brace cannot be turned round; in… … The same end is more conveniently fulfilled by the ratchet-drill,Fig. 356, apparently derived from the last; it is made by cuttingratchet teeth in the drill shaft, or putting on the ratchet as a separatepiece, and fixing a pall or detent to the handle; the latter may thenbe moved backward to gather…
Metal-work · Electrometallurgy · Metallurgy
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