Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 212
oid, 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 R projectionof X lies on this circle and below x, i.e. either at a;* (on the fronthalf) or at x* (on the rear). • Again the assumed… … Fio. 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
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
