Lange, David C. (David Christoph) · New York : John Wiley & Sons ; London : Chapman & Hall · leaf 19
ectionlies at the intersection of a line perpendicular to the GLthrough this point in the GL, and the projection of the line.(Art. 6.) To obtain the H Trace of the line, the line is continuedto the H Plane, which is shown by the Vertical Projectionintersecting the GL. This is the V Projection of… … Fig. 22 POINTS, LINES AND PLANES 9 20. To determine the true length of a Hne joining twopoints in space. Let A be the given line. (Figs. 19 and 20.)A line is seen in its true length upon that coordinateto which it is parallel or in which it lies. By revolvingthe line, therefore, into or parallel to…
Shades and shadows · Geometry, Descriptive
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