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 34
Having in this manner drawn the describing hyperboloid, we have next to find, by means of it, thetooth-surfaces. The principle of the method of doing this is illustrated in Fig. 2124. The pitch-surface is the one with the vertical axis; the large circle in the top view is the upper base, and…
Mechanical engineering -- Dictionaries
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