Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 163
Fig. 219.this arc and the 142 DESCRIPTIVE GEOMETRY [XV, § r38 The ease with which the revolved position is obtained inthis particular situation of the plane suggests another methodfor solving the general case, since an auxiliary plane of pro-jection can always be assumed perpendicular to either… … Fig. 220. any given plane (see § 70). Such a construction is shown inFig. 220, and is left without further explanation to the student. Corollary. To find the revolved position of a line lying in aplane, when the plane is revolved into H or V about the corre-sponding trace. Since a straight line is…
Geometry, Descriptive
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