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 188
h a single piece of metal must becut, if required to produce Fig. 138. Every one of the group ofsides, must be individually equal to one of the sides of the pyramid, FOLDED WORKS WITH CURVED SURFACES. 183 whether it be regular or irregular, and 138 being an erect and equi-lateral figure, all the… … 141. The cone is sometimes compared with a pyramid with exceedinglynumerous sides, (as the cylinder is compared with the prism,) andFig. 141, intended to make a funnel or the frustum of a cone of thesame proportions as 138, illustrates this case. The sides of the coneare extended until they meet in…
Metal-work · Electrometallurgy · Metallurgy
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