Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 57
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… … Fig. 2. plane of distinct vision. In this case,while the eyes remain adjusted correctlyfor any point in the plane D E, the pointC will appear projected on that plane, oncefor each eye, namely, at D and at E ; andthis proportion will be found to obtain A C:C D : : A B : D E. To illustrate this by an…
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