Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 182
e element oc.(Fig. 159.) (2) Second method. An-other method consists inassuming any point withinthe V projection of thecone as the V projectionof the required point, as o in Fig. 159. Now pass an auxil-iary H plane through the point o. It will cut a circle ofdiameter ?re w from the cone. Next find… … Fio. 159 164 DESCRIPTIVE GEOMETRY tVIII, § 148 assumed point is chosen on the visible or on the invisible partof the cone. [Note. If the cone is thought of as a surface of transposition(§ 139), the circle mn is an element. Thus either of the abovemethodsis seen to depend upon determining an element…
Geometry, Descriptive
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