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 25
radius OP,the direction of that arc is also the direction of Os path at that instant. When 02 becomes thecontact-radius, the instantaneous centre will be the point 2 on A B. But as the chord 0 2 of thecircle does not change its length, it must then be the instantaneous radius ; therefore, if about… … GEARING. 17 point; and these arcs being traced by 0, which also traces the cycloid, it follows that the lattercurve is tangent to the arcs. If then we take as centres the points 1, 2, 3, etc., on A B, and aboutthem describe arcs, using as radii the chords 0 1, 0 2, etc., the envelope of these arcs,…
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