Lange, David C. (David Christoph) · New York, John Wiley & sons, inc.; [etc., etc.] · leaf 17
ght line, perpendicular to the Ground-Line.(Fig. 3.) 6. Two projections are always necessary definitely tolocate a point or line in space. 7. The distance of a point in space above the HorizontalPlane is equal to the distance of the Vertical Projection ofthe point from the Ground-Line; and the… … Fig. 14 POINTS, LINES AND PLANES 5 distance of the Horizontal Projection of the point from theGround-Line. (Figs. 2 and 3.) 8. A point situated on either Coordinate Plane is itsown projection on that Plane, and its other projection is inthe Ground-Line. (Fig. 6.) 9. A straight line is determined by…
Shades and shadows · Geometry, Descriptive
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