Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 824
GEERING. 813 One of these arcs, as that intercepted by pp in Fig. 2018, comprehends a complete tooth and space,meaning by space the hollow opening between two contiguous teeth. … By the pitch lines of a geering pair is, therefore, to beunderstood the proportional circles in which they wouldrevolve upon each other if they were simply cylinderswithout teeth; and the pitch of the teeth is the lengthof arc of the pitch circles, measured from the centre ofone tooth to the centre…
Mechanical engineering
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