Applied perspective, for architects and painters (1901)
Longfellow, William Pitt Preble, 1836-1913 · Boston and New York, Houghton, Mifflin and company · leaf 137
ct, — of the box in Fig. 113, for in-stance. It follows also that the Centre must always be inside the triangle WV,which means that the triangle must be acute-angled (Fig. 116). In Fig. 117, we have all three of the triangles that make up the solid angle 5 re-volved into the picture plane, S, S,… … TRI-CONJUGATE VANISHING POINTS 77
Perspective
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