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 27
easily construct-ed, as in Fig. 2109. The circumferencebeing divided into equal parts at thepoints 0, 1, 2, etc., a tangent is drawn at each point, and on it is set off the length of the arc meas-ured from the point of starting to the point of tangency. Thus, let the semi-circumference be unwoundto… … GEARING. 19 the circle being 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…
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