Scribner's engineers' and mechanics' companion : comprising United States' weights and measures : mensuration of superficies and solids ... the mechanical powers ... steam and the steam engine (1848)
Scribner, J. M · New York : Huntington and Savage · leaf 109
lbs. Ans. When only one of the Bodies is movable. Rule.—As the length of the wedge is to its back, so is the resist-ance to the power. Example.— What power, applied to the back of the wedge, willraise a weight of 18000 lbs., the wedge being 8 inches deep and 125long on its base 1 As 125 : 8 : :… … THE SCREW. 107 THE SCREW. The screw is a spiral thread or groove, cut round a cylinder, andevery where making the same angle with the length of it. So thatif the surface of a cylinder, with this spiral thread on it, wereunfolded and stretched into a plane, the spiral thread would form astraight…
Mechanical engineering · Weights and measures
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