Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 200
t to solve problems, however, when thecone is projected as in Fig. 260. Since the base of the coneis a plane curve, it can be projected as a straight line (§ 151).In Fig. 260, let B (HB, VB) be the plane of the base, found bypassing a plane through any three points of the curve (Prob.6, Cor. II, §… … Fig. 200. the secondary projection, CV, of the cone, the base will pro-ject as a straight line. Since this transformation always can be effected, we shalldiscuss further only those cases of cones and cjlinders inwhich one projection, at least, of the base is a straight line.This results when the…
Geometry, Descriptive
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