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 11
ed them to be placed in a distinct class. These five varieties are those most extensively used in modern machinery, and the general appear-ance of a pair of wheels and their pitch-surfaces, ofeach class, is shown in Figs. 20G4 to 2068. Face-gearing is now rarely met with; the name is derivedfrom…
Mechanical engineering -- Dictionaries
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