The dictionary of photography for the amateur and professional photographer (1897)
Wall, E. J. (Edward John), 1860-1928, Bolas, Thomas · London : Hazell, Watson & Viney · leaf 151
ondensed by the large lens beyond d. The best form when only two lenses are used, is that shown in fig. 27, according to Mr. Traill Taylor, whose notes on this subject we have condensed, and consists of a plano-convex lens with its flat side Fig. 26. to the radiant, the second lens being a crossed… … Fig. 27. in thin cells that they can be turned round, otherwise the expan- sion by the heat may cause them to crack. Clock glasses filled with liquid have been suggested as condensers for enlarging, but are so long in focus as to be practically useless. Conjugate Foci. See Focus. Constants, Table…
Photography
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