Descriptive geometry . Fig. 110. Fig. ill. Example 6 (Fig. 111). A torus, cut by two planes parallelto V. The X section, wholly on the hack of the surface, isinvisible. The FTsection, entirely on the visible part of thetorus, is wholly visible. The true, size of each section appears at once. 66 DESCRIPTIVE GEOMETRY [IX, § 86 Example 7 (Fig. 112). A hyperbolic spindle, cut by tv:oplanes parallel to V. Each plane cuts a section composed of

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