Applied perspective, for architects and painters (1901)
Longfellow, William Pitt Preble, 1836-1913 · Boston and New York, Houghton, Mifflin and company · leaf 56
the required point on aV,and ab will be perspectively equal to ab. For, aa being a front line, bb is so also, and the two are parallel in space. Imaginea measuring line drawn from the inaccessible m on aa! at the proper distance from a,making am=am. The two triangles abm and abm in space are… … Thus far we have used only single or unrelated vanishing points, except in the case ofPerpendiculars and Diagonals, for which we have found a special treatment. But mostof the objects which are drawn in per-spective, buildings, furniture, and thelike, are either rectangular or based onrectangular…
Perspective
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