Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 189
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. … Fio. 167 It will be seen from the above examples that much ingenuitycan be exercised in selecting an auxiliary plane or other surfacethat suits the given conditions. A wise selection is possibleonly when the surfaces to be dealt with are thoroughly under-stood and a number of cases have been worked…
Geometry, Descriptive
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