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 961
r-stem by an ingenious contriv-ance called a jar, Fig. 4277, consisting of twolinks or loops of iron or steel, which slide inupon each other when the drill strikes bottom, thus, by a quick blow upon the top of the auger-stem, increasing the effect of the fall; and on the upward movement the sudden… … WELL-BORING. 927 ing-beam by means of a temper-screw, 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…
Mechanical engineering -- Dictionaries
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