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 24
cylinder. The cylinders in Fig. 2099 are externally tangent, and it is obvious that if the helix onone be right-handed, that on the other will be left-handed. An annular wheel, with its pinion, maybe also made with twisted teeth in the same manner. In this case, the larger pitch-cylinder…
Mechanical engineering -- Dictionaries
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