Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 166
by a point mov-ing on the surface ofa right circular cylinder, in such a manner that a uniform angularvelocity is combined with a uniform velocity parallel to the axis. In Fig. 147, abed is the elevation and 1, 5, 8, 12 is the planof a right circular cylinder. The generating point starts from1,… … Fig. 146 150 DESCRIPTIVE GEOMETRY [VII, § 137 the same height and moving in the opposite direction. On thefront of the cyUnder, this curve ascends toward the right, and is said to be a right-handhelix, with a pitch of 1/2 p. It will be seen that theinstantaneous direction of ahelix, with respect to…
Geometry, Descriptive
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