Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 280
co, and of the same radiusas the lens, and this surface is made to rise and fall to accom-modate it to the change of focus produced by objects at dif-ferent distances. A camera obscura which throws the imagedown upon a horizontal surface may be made without anymirror, by using any of the lenticular… … <m mmm msmmw, 276 A TREATISE ON OPTICS. PAIIT IV. L N, and P Q,; these lenticular prisms may be formed by ce-menting plano-convex or concave lenses on the faces A B, B Cof the rectangular prism A B C, or the convex lens may beplaced near to A B. If we wish to form an erect image on a vertical…
Optics
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