Applied perspective, for architects and painters (1901)
Longfellow, William Pitt Preble, 1836-1913 · Boston and New York, Houghton, Mifflin and company · leaf 128
efore, indefining the curvature of the perspective circle by tangents. The tangents at the 45°points have been already provided by the enclosing squares. Fig. 107 shows that thelast method provides a tangent at any point. We draw the tangent at a point/ of thesemicircle, at right angles to the… … DIAMETERS AND AXES The ellipses into which circles are projected in perspective being symmetrical curves,some advantage may be taken of this quality in drawing them. It is convenient toknow the axes, the longest and shortest diameter, which are at right angles ; it takes,however, some trouble to…
Perspective
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