Higbee, F. G · New York, John Wiley & Sons · leaf 177
166 ESSENTIALS OF DESCRIPTIVE GEOMETRY tance during one revolution. The point i in revolving about the axis describes a circle whose plan view is shown at i 13 1, and moves up or down the given pitch distance. Therefore,divide the circle into 24 equal parts and the pitch distance into … Fig. 132 the same number of parts. As the point moves from i it willalso advance so that it will take up the position 2, 3, 4, etc.,thus describing a helix; and at the same time 0 moves alongthe axis so that the motion of the line Oi generates a right WARPED SURFACES 167
Geometry, Descriptive
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