Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 180
b on the element oc.(Fig. 159.) (2) Second method. An-other method consists inassuming any point withinthe F projection of thecone as the V projectionof the required point, as a in Fig. 159. Now pass an auxil-iary H plane through the point o. It will cut a circle ofdiameter m n from the cone. Next… … FiQ. 159 164 DESCRIPTIVE GEOMETRY [VIII, § 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 above methodsis seen to depend upon determining an…
Geometry, Descriptive
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