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 376
diameter or the section of a screw andnut, is less objectionable than any variation in the coarseness orpitch; as the latter difference, even when very minute, will pre-vent the screw from entering the hole, unless the screw is madeconsiderably smaller than it ought to be, and even then it will… … 372 SCREW-CUTTING TOOLS. Fig.475. For instance, the upper line a, contains exactly 4 threadsper inch, and the middle line or b, has 4J threads; they only agreeat distant intervals. The lowest line c, shows that which wouldresult from forcing a tap of 4 threads such as a, into a hole whichhad been…
Metal-work · Electrometallurgy · Metallurgy
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