Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 151
Fig. 206. Fig. 207. In this new position, the plane will be perpendicular to V.Hence the F-trace, VS, will be an edge view of the plane, andmust therefore pass directly through c. A plane may be revolved until perpendicular to H by using XIV, § 135] THE REVOLUTION OF PLANES 131 an axis…
Geometry, Descriptive
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