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
the teeth are by the above process reduced to rectilinear elements of the pitch-surfaces. The axesof spur-wheels are parallel, and the pitch-surfaces are cylinders; the axes of bevel-wheels intersect,and the pitch-surfaces are cones whose common vertex is the point of intersection; the axes…
Mechanical engineering -- Dictionaries
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