Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 151
fixed point c, it will benecessary to revolve but one line of Q. This line may con-veniently be the //-trace, IIQ, of Q, which is now revolvedabout ch as a center to the required position HR. The F-trace,VR, is then determined by the fact that the plane R must con-tain the point c. Consequently R…
Geometry, Descriptive
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