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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 371

An illustration from 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, leaf 371
9, the screw of 24 inches in length, one of 8 feet inlength was obtained; the thread was cut one-third of its depth,with the wheels, successive portions being operated upon and thetool being carefully adjusted to the termination of the part previously 366 SCREW-CUTTING TOOLS. cut. The general troth… … tureo at Lowell. This instrument is geered with t rest for holdim?drills and reamers moved by a toothed rack, backhead stock adjust8steel ^ mt-,r0n C0M *> bearings, and S- Figs. 468. 469. METHODS OF ORIGINATING SCREWS. 367 Although the processes 7 and 8 will produce a most uniforin screw,Mr.…

Metal-work · Electrometallurgy · Metallurgy

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