Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 237
eadily obtained, but for Fran auxiliary lineis necessary. The line used here is /;, parallel to the line A.The projection /»,. a point, is assumed in V\T. From />, ;l■obtained Bhand Bv. TheF-trace,t2,of B locates a point in I/. 216 DESCRIPTIVE GEOMETRY [XX, § 171 Problem 40. To pass a plane… … Fig. 301. the axis as a vertex, circumscribe the given surface by a coneof revolution. Pass the required tangent planes through thegiven line tangent to the auxiliary cone. Construction (Fig. 301). The given surface is an oblatespheroid, with its axis perpendicular to H. The given line Aintersects…
Geometry, Descriptive
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