Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 57
e linejoining (the centres of) the spectators twoeyes, and whose lines intersect the planeof distinct vision; the line joining thesetwo points of intersection, being parallelto the line joining the spectators two eyes.We can thus estimate the breadth of dupli-cation for any given distance beyond… … Then, because D E is pa- DE,* point beyond,rallel to A B, AC :DC :: ABgiving D E as the breadth of the duplica-tion or error. Again, let us suppose the point C tobe indistinct and double, in consequenceof its being too near the spectator, namely,nearer than the selected plane of distinctvision. We…
Photography · Art and photography
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