Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 301
eend of that part which is marked as actin-ism, A, there the chemical effect wouldtake place in a very much shorter timethan at any other part between it and thebest luminous focus. Thus we get a lumi-nous image refracted to a certain extent;we obtain the calorific point, indicating amuch less… … upon its edge, we find a certain amount ofrefraction producing color, then endeavor-ing to correct this, and to produce chroma-tic correction, we place a second prismnear its further edge, we shall find thatupon this prism, we have received the redand the yellow rays, L, H,—that we haveindeed…
Photography · Art and photography
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