Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 962
crew, Fig. 42*78, suspended from it and made fast to the rope bya screw-clamp. This temper-screw is about 3 ft. long, and is made with a coarse thread thatworks in a thin frame. At the lower end of this screw is a wheel, by which it is let down after eachstroke, whereby the tension is regulated and… … withdrawn by aid of the bull-wheel and shaft.The sediment and battered rock are removed bymeans of a sand-pump, Fig. 4280, which is aheavy metal tube, slightly smaller than the well-bore, and about 6 ft. long, with the lower endclosed by a simple valve opening upward; this islowered and withdrawn…
Mechanical engineering -- Dictionaries
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