On the philosophy of painting: a theoretical and practical treatise.. (1849)
Twining, Henry · London, Longman, Brown, Green, and Longmans · leaf 479
the circumstance, that the apparent diminution of theimage is in every case exactly relative to the length ofthe cone or fasciculus of rays, which, emanating fromthe object, is reflected back to the eye. He mightobserve, in the first place, that as he moves from aposition at some distance from the… … The observer is situated at some distance from the object,which itself is near the mirror. himself remains stationary, but causes the mirror to bemoved backwards, the result is a very rapid diminutionof the reflected image ; for, by the removal of themirror, the fasciculi of rays which convey to…
Painting · Aesthetics · Perspective
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