Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 97
Fig. 127. t, in VQ, and find th on GL. Then, by § 99, Ah passes throughth and is parallel to HQ, while Av passes through f and isparallel to GL. Similarly, a vertical principal line, B, may be drawn by firstassuming its ZZ-trace, s, on HQ. 101. To Project the Principal Lines of a Plane Parallel… … profile trace, PQ, of the given plane. On PQ assume anypoint, up, as the profile trace of the required principal line.Both projections of this line are parallel to the ground line. X, § 103] PARALLEL LINES AND PLANES 77 102. A Plane Containing a Line Parallel to H or V. Anyplane, as Q or R, Fig.…
Geometry, Descriptive
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