Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 207
ghbv draw Lv parallel to GL. Then the line L lies in the planeT, and the F-trace, t2, of L is a point in VT. Example 2 (Fig. 275). The base of this cone lies in V.Tangent planes are passed at the points a and b. For the 186 DESCRIPTIVE GEOMETRY [XIX, § 162 plane Q, tangent at a, the trace VQ is… … Fig. 275. line of Q, drawn through the given point a. The 77-trace of Llies in HQ. The plane T is tangent at the point b. The trace VT isdrawn tangent to the base of the cone, through the F-trace ofthe element F passing through b. In this case VT does notintersect GL within reach, neither is the…
Geometry, Descriptive
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