Lange, David C. (David Christoph) · New York : John Wiley & Sons ; London : Chapman & Hall · leaf 21
f a line or point lying in aplane, to find the other projection. Let a^b^ be the H Projection of the line, and c^ be theH Projection of the point, lying in the plane P. (Figs.23 and 24.) The traces of the line in the given plane containing thegiven point must lie in the traces of the plane. The… … POINTS, LINES AND PLANES 11 plane, tc find its position when the plane is revolved aboutits trace to coincide with either coordinate. Let ab be the line and c the point, lying in the planeP, and shown by their projections. (Fig. 25.) The axis about which the point or points of the linerevolve must…
Shades and shadows · Geometry, Descriptive
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