The book Mechanics, Theoretical, Applied, And Experimental was written by author W W F William Wade Fitzherbert Pullen Here you can read free online of Mechanics, Theoretical, Applied, And Experimental book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Mechanics, Theoretical, Applied, And Experimental a good or bad book?
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302), of the teeth on the point of the pawl shall pass between the pawl-pin and the wheel, thus pro- ducing a moment on the pawl eciual to R X rt^ in a direction tending to keep it in contact with the wheel. It is sometimes necessary to use a pair of pawls, such as P and Q in Fig. 303, when it is desirable to minimize the backlash or lost motion between the 1''IG. 3Q2. 364 Mechanics. teeth and the pawl. It will be noticed in the figure that the point of the pawl P is half a tooth further in adv...ance than the point of the pawl Q. Using the two pawls is equivalent to doubling the number of teeth in the ratchet-wheel. A friction feed is shown in Fig. 304. A ring, S, fits loosely over the plain wheel W. A bent Fig. 303. Fig. 304.— a friction ratchet-gear. lever, L, is attached to the ring S with a pin. When the upper end of the lever is moved in the direction of the arrow A, the foot F is lifted from the wheel, and after the lever comes against the lug H, the ring and lever are carried round together as one body.
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