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 10
ill ultimately become mere lines, or elements of surfaces in contact. These are called the pitch-surfaces ; their relative motions are the same as those of the wheels from which they are thus de-rived, and their forms and disposition depend upon the class of gearing to which those wheels…
Mechanical engineering -- Dictionaries
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