Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 157
ith any assumedradius, the radius being the distance from o to the requiredplane Q. Tangent to the circle, draw the edge view VR, which repre-sents the plane perpendicular to V, at the given angle a withH Xow VR intersects the axis at c, and the ground line at e.Hence c is the fixed point on VQ,… … Fig. 214. XIV, § 137] THE REVOLUTION OF PLANES 137 with V. We find that HS intersects the axis at d, and theground line at g. Hence, d is the fixed point on HQ, while VQmust be tangent to the arc gj, drawn with center o and radius og.
Geometry, Descriptive
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