Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 239
f isusually easier to employ the firsl analysis. The following con-struction is made by the first analysis. Construction (Fig. 302). The given surface is thai of a aolidtorus, only the outer (doubly-convex) portion of the curved 218 DESCRIPTIVE GEOMETRY [XX, § 171 surface being retained. The axis… … Fig. 302. draw the tangent planes & (HQ1} VQi) and Tx (HTU VTJ. Re-volve Qi and Tx about the axis of the torus to the positionsQ (VQ, HQ) and T (VT, HT), so that each plane contains theline A (§ 134). Then Q and T are the required tangentplanes. CHAPTER XXI THE INTERSECTION OF CURVED SURFACES…
Geometry, Descriptive
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