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 28
the instantaneous centres, the tangents 1 1, 2 2, etc., are the instantaneous radii.These tangents are also not only the normals to the curve, but also the radii of curvature at the cor-responding points. Of Circular and Diametral Pitch.—The term pitch, as has been explained, is used to denote…
Mechanical engineering -- Dictionaries
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