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 280
r triple square thread, the Fig. 303. rise of which is from aboutone to six inches in everyrevolution. The nut of thescrew is mostly of gun-metal,and fixed in the upper partor head of the press. Thetop of the screw is square orhexagonal, and carries alever of wrought iron, ter-minating in two solid… … punched, whilst the righthand of the operator is employed in working the press. The screw is generally attached to a square bar called the follower,which fits accurately in a corresponding aperture, and is strictly ina line with the screw; and to the follower is attached the punchshown detached at…
Metal-work · Electrometallurgy · Metallurgy
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