Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 210
spheroid, it must be on the line of intersection be-tween the spheroid and P. This line of intersection is seen asa circle on plan, the diameter of which is ah. The H projectionof X lies on this circle and below a;, i.e. either at x^ (on the fronthalf) or at a;* (on the rear). Again the assumed… … Fig. 179 194 DESCRIPTIVE GEOMETRY [VIII, § 171 171. To Draw a Line Tangent to a Double-Curved Surface ofRevolution at a Given Point on the Surface. If a plane cutsfrom the given surface any curve, any line in the cutting planeand tangent to the curve is tangent to the surface (Fig. 153). In Fig.…
Geometry, Descriptive
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