Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 188
Fig. 165 In Fig. 166, the position of the objects is such that an auxiliaryprojection on a V plane, parallel to the base of the cylinder,is found most convenient. Once this projection is found,planes passed through the apex and parallel to elements of thecylinder, as X, will cut straight lines from… … Fig. 166 172 DESCRIPTIVE GEOMETRY [VIII, § 152 When both surfaces are surfaces of revolution and theiraxes intersect, as in Fig. 167, concentric spheres with theircenters at the intersection of the axes can be used. This caseis more fully treated in § 177, II.
Geometry, Descriptive
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