Fairbairn, William, Sir, 1789-1874 · London, Longman, Green, Longman, Roberts & Green · leaf 34
WHEELS AND PULLIES. Fig. 189. 13 … The Pitch of Wheels. We have seen that the pitch of a wheel is the length of anarc of the pitch line comprising a tooth and space. Mill-wrights ordinarily measure the pitch as a chord of this arc,and, except in pinions with very few teeth, the two measure-ments sensibly coincide. Having the…
Mills and mill-work · Machinery
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