Lange, David C. (David Christoph) · New York : John Wiley & Sons ; London : Chapman & Hall · leaf 15
me straight 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;… … Fig. 10 Fig. 11 .b lb ^^ A\ V.trace^/JW ^^r ^ ^?S 1 .^^-^ Zi^^^S 1 11 1 \ /^^ u-^c^ \ /^^ Fig. 12 Fig. 13 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…
Shades and shadows · Geometry, Descriptive
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