Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 116
b- \na CLh a. N %-1 S^ > … Fig. 161. Fig. 102. to Av, and from the point in which VQ intersects GL drawHQ perpendicular to Ah. Then Q is perpendicular to A(§ 112) and is the required plane. Note that the auxiliary line M is a horizontal principal lineof the required plane Q. The construction could also beeffected by using an…
Geometry, Descriptive
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