A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 217
set of helical blocks is shown in outline in Fig. 222. The pulley A is operated by hand bymeans of an endless chain,and rotates a worm B. Theworm is simply a screw cuton the spindle, and engageswith the teeth on a worm-wheel C. Each revolution ofB causes one tooth on C toadvance ; hence, if there… … FRONT ELEVATION END ELEVATION FlO. 221.—Wheel and differential axle. XIV SCREWS 193 then P will advance a distance «CLA for one revolution of C. The chain sustaining the load W is fixed at E to the upper block, passes round F, and then is led round D, which has recesses fitting the links in order…
Physics
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