Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 62
Fig. 38 IV, § 401 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 quad-rants II and III they… … Fig. 40 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…
Geometry, Descriptive
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