London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 459
nent manner. I be to point out an error which your engraver has inadvertently made inmisplacing this line in the plate copied from my work (fig. 117. p. 273.). Bysubstituting the accompanying cut {fig. 175.) for the incorrect one in ques-tion, you will oblige me, as the adjustment of the line of… … 175 rays ; c d, the axis of vision ; and, as I have demonstrated, the line of projec-tion (a i) must be drawn at right angles to the axis (c d), so that it mayproject with optical, as well as with mathematical, truth. The point relativeto the planes for the perspective altitudes 1 1, 2 2, 3 3, 4 4,…
Architecture
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