Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 106
of the auxiliary plane, the construction often can be simplified materially. In Fig. 92, using the same line and plane as be-fore, the auxiliary planehas been passed throughah, and perpendicularto H. The H trace,77*, will pass througha^ft*, while the V trace,YY^, will be perpen-dicular to HA.… … Fig. 92 90 DESCRIPTIVE GEOMETRY [VI, § 78 By comparing Figs. 91 and 92, the simplification broughtabout by choosing an auxiliary plane which is perpendicularto a plane of projection will be evident. Sometimes it is betterto choose the auxiliary plane perpendicular to one, and some-times to the…
Geometry, Descriptive
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