Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 229
plane, introduce as auxiliaries one or nunc of thelines indicated by the first and second analyses. Construction (Fig. 296). The surface chosen to illustratethis, the general case, is that of a torus. Let a (a*, a) be the 208 DESCRIPTIVE GEOMETRY [XX, § 170 given point in the surface. Revolve the… … V Dv \ \K |/fc Lv y \^ s ^ \> xk ,/t. X Fig. 296. tangent plane at this point. The if-trace of this plane is HT^.Counter-revolving the torus to the first position, HTX takesthe final position HT (reverse of § 134). The tangent plane,as shown at VT1} intersects the axis at the point / (/,…
Geometry, Descriptive
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