Applied perspective, for architects and painters (1901)
Longfellow, William Pitt Preble, 1836-1913 · Boston and New York, Houghton, Mifflin and company · leaf 137
up of three rightangles (Fig. 115). Therefore by the theory of projections, VC, which is the ortho-graphic projection of SV on the picture plane,will be perpendicular to VV, the horizon ofthe plane SV V, that is, VC prolonged will coin-cide with CC1,— or the perpendicular CC pro-duced will pass… … JFcff. //j Note. That VC is perpendicular to VV maybe proved geometrically thus: SC, beingthe Axis; is normal to the plane VV V, which is the picture plane. Join VC, Fig. 115, produceit till it meets VV in x, and draw Sx. The plane VSx, containing the Axis SC, must benormal to the picture plane. It…
Perspective
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