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 338
de is available as thegerm for the production of a set of left-hand taps- and dies. Figs.435 and 436 represent a different mode of originating a left-handedscrew, proposed by Mr. Walsh; the tool is to be a small piece of aright-handed screw, which is hardened and mounted in a frame likean ordinary… … fitted in three equidistant radial grooves in the stock, the ends of thedies came in contact with an exterior ring, having on its inner edgethree spiral curves, (equivalent to three inclined planes,) and on itsouter surface a series of teeth into which worked a tangent screw,so that on turning the…
Metal-work · Electrometallurgy · Metallurgy
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