Applied perspective, for architects and painters (1901)
Longfellow, William Pitt Preble, 1836-1913 · Boston and New York, Houghton, Mifflin and company · leaf 124
s do not in perspective make parallel ellipses or concentric ellipses,or even similar ellipses, nor have they parallel axes except in special cases. The axeslook parallel, and are convergent in perspective. The curves offer, then, none of thehelps which we look for in concentric figures, but each… … CIRCLES IN OBLIQUE PLANES 69 square within the first or outside it on the same diagonals and cardinal diameters, andto draw the second curve through the corresponding intersections (Fig. 104). Themethod of the double square is convenient here as before. The corresponding pointsare found, evidently…
Perspective
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