Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 273
Line Tangent to the Intersection. A tangentline is drawn at the point 10. This line is the intersection ofthe given plane Q with the plane S, tangent to the surface atpoint 10 (§ 178). Find the tangent plane S by any conven-ient method (Prob. 38, § 170). Here only the H-tra,ce, HS, isfound. The… … Fig. 313. 183. Points in Meridian Planes. Attention has already beencalled, in the preceding constructions, to certain properties of XXIII, § 184] PLANE AND TORUS 253 the points which lie in the principal meridian plane and themeridian plane of symmetry. These points are of sufficientimportance to…
Geometry, Descriptive
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