Applied perspective, for architects and painters (1901)
Longfellow, William Pitt Preble, 1836-1913 · Boston and New York, Houghton, Mifflin and company · leaf 139
by laying off the length of the sub-axis from C toS on HH, and drawing a perpendicular to OS, which would meet the prime verticalCCin the vanishing point of normals, that is, in V. But since this point is inaccessible, a point S/3 is taken at a third the distance from C to S, and a line drawn… … T^./JZ/
Perspective
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