Dunkerley, Stanley, 1870- · London, New York [etc.] Longmans, Green · leaf 285
that W, is the common normal to theteeth at their point of contact. The only kinematic conditiontherefore, that has to be satisfied is, that the common normal tothe two teeth at the point of contact must always pass throughthe pitch point. If the upper pitch circle roll over the lower T 274… … Fio. 300.the tooth M; or, in other words, the shape of M is the envelopeof the successive positions of L (§5). Knowing, therefore, theshape of the tooth L, the profile of L may be drawn in succes-sive positions as the upper pitch circle rolls on the lower one;and, by drawing a curve to touch the…
Machinery, Kinematics of
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