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 155
or irregular bore, see Fig. 100; e, has tworectangular cores crossing each other at right angles: and/, is thecap of a double-acting pump, the core for which is shown in sectionby the white part of Fig. 109, the shaded portions being the metal:the great aperture leads to the piston, the two smaller… … In addition to the cores used for making holes and mortises, muchingenious contrivance is displayed in the cores employed for otherworks of every-day occurrence, the undercut parts of which wouldretain them in the sand but for the employment of these and analo-gous contrivances. It will be now…
Metal-work · Electrometallurgy · Metallurgy
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