Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 97
lane. Their F-projections areparallel to this trace, their ff-projections are parallel to theground line. These tun groups of lines are, in general, different. Theyreduce to the same set when, and onl\ when, the given planeis parallel to the ground line. /-^Av\ V / 7 Fig. 126. 76 DESCRIPTIVE… … 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…
Geometry, Descriptive
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