Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 64
Fia. 38 rv, § 40] VARIOUS QUADRANTS 45 H projecting lines for points in quadrants I and II are drawndownward, while for points in quadrants III and IV they aredrawn upward. Similarly in quadrants I and IV, the Vprojecting lines are drawn away from the observer while in qviad-rants II and III they… … 40. opening the Planes. The manner of opening the planespreviously established for the first quadrant is retained, i.e.the part of V which is above H is rotated backward into H.At the same time that part of V which lies below H rotates for-ward and upward into H. In other words, the entire V…
Geometry, Descriptive
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