Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 26
s many planes of pro-jection, must be used. 6. Choice of the Planes of Projection ; the Coordinate Planes. The simplest and most advantageous angle between the planesis a right angle. At any given point On the earths surface, there are twonatural mutually perpendicular directions, which must… … Fig. 7.
Geometry, Descriptive
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