Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 121
d profileplane. Find the profile tracesPQ and PR of the given planes(§ 60). Their intersection givesup, the profile trace of the re-quired line of intersection A.From u obtain uh and uv, onepoint in the line A. A secondpoint is not necessary, since thisline must be parallel to both H and V (Case… … Fig. 170 the plane R being parallel to H. The plane R therefore inter-sects Q in a horizontal principal line of Q (§ 99). If the plane R be taken parallel to V, the intersection be-comes a vertical principal line of Q. XII, § 118] INTERSECTION OF PLANES 101 This is an important case, since, on…
Geometry, Descriptive
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