Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 294
of the curve of intersection must pass.The intersection is a continuous curve, containing one doublepoint. If both limiting planes are tangent to each surface, the in-tersection breaks up into two plane curves. Since the onlyplane curves which can be drawn on a cylinder are circles andellipses, the… … Km. 323. 274 DESCRIPTIVE GEOMETRY [XXV, § 194 Thus, in Fig. 324, which shows the F-projection only, theplane X, parallel to the left-hand contour element of the conewhose vertex is a, cuts a parabola from this cone. A cone
Geometry, Descriptive
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