Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 254
vailable. In thiscase, had we begun by taking the auxiliary planes perpendicu-lar to V, we would have been confronted by a similar situation. The method given below is a general one, and may be usedwhen finding the intersection of any ruled surface with aplane. Let L (Lh, Lv) be any arbitrarily… … Fig. 30G. 234 DESCRIPTIVE GEOMETRY [XXII, § 180 erning the choice of the line L should be apparent afterobserving the use which is made of it. The line L intersectsthe plane X in the point a (see Fig. 178, § 119). But L lies inthe plane Q. Hence the point x lies in both the planes X andQ,…
Geometry, Descriptive
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