Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 85
. 64 DESCRIPTIVE GEOMETRY [IX, § 86 Example 3. (Eig. 108). A sphere cut by a plane perpen-dicular to V. Here the intersection, as seen in elevation, liespartly on the upper half of the sphere, and partly on thelower. Hence, in the plan one part of the curve is visible, andthe other part invisible.… … Fig. 108. Fig. 109. Example 4 (Fig. 109). A torus (§ 26) cut by a plane per-pendicular to V. An auxiliary plane, such as M, cuts the gen-erating circle in two points. Hence, in this plane two circleslying in the surface of the torus can be drawn, one of diameterad, and the other of diameter be.…
Geometry, Descriptive
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