Applied perspective, for architects and painters (1901)
Longfellow, William Pitt Preble, 1836-1913 · Boston and New York, Houghton, Mifflin and company · leaf 113
t distancesfor V. The device is simple and practical, butits convenience is narrowed because it can only be set to fixed distances. Another centrolinead, which obviates this difficulty, is a T-square with isosceles tri-angular head traversing between two fixed pins, as in Fig. 84. Here again the… … always point to the farther extremityVoi that diameter of the circle whichbisects the chord aa. According asthe pins are set nearer or farther apart,the chord and the diameter of thecircle will diminish or increase, andthe vanishing point approach or re-cede. By reversing the blade of thesquare, so…
Perspective
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