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 304
he spring-catch. Holes may be extended to about half an inch diameter, with thehand-brace ; but it is much more expeditious to employ still largerand stronger braces, and to press them into the work in variousways by weights, levers, and screws, instead of by the musculareffort alone. Figure 351… … 300 DRILLS. ■which works the beam a b, the pin near a is placed at any height,but the weight w is not usually changed, as the greater or less pres-sure for large and small drills, is obtained by placing the brace moreor less near to the fulcrum a; and this part of the beam is shodwith an iron…
Metal-work · Electrometallurgy · Metallurgy
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