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- W4205651193 abstract "1.(1) The theories of Svedberg and Silberstein on the formation of the latent image are shown to be inadequate. A criticism of of on these theories is experimentally confirmed.2.(2) Toy's theory of photosensitive nuclei is discussed. New experimental data are found to be incompatible with the theory.3.(3) It is shown that the specks of “foreign material”, accepted by Toy as “photosensitive nuclei” cannot be photosensitive if the photochemical equivalence principle holds, nor can they affect the photosensitivity of silver bromide in the accepted sense.4.(4) It is suggested that the sole function of the specks is to collect about them the silver atoms produced by the photochemical decomposition of silver bromide. There is no catalysis of photochemical decomposition, but only an (auto)catalyzed orientation of the decomposition.The action of the specks is purely topochemical. We suggest that they be termed “sensitizing specks.”5.(5) The action of light itself can supply centres in the absence of foreign nuclei.If the first reduced silver atoms have an orientating effect which autocatalytically increases with the size of the speck itself, Svedberg's conception that a certain minimum number of light-quanta must fall within a certain maximum area to form a developable centre is unnecessary.6.(6) The theory suggested gives a very simple and direct explanation of the influence of grain size on apparent photosensitivity. It is shown that the theory leads over to Silberstein's as a limiting approximation when exposure and grain size are arereased.7.(7) The genesis and dimensions of the specks are discussed." @default.
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- W4205651193 date "1921-10-01" @default.
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- W4205651193 title "The size-frequency distribution of particles of silver halide in photographic emulsions and its relation to sensitometric characteristics" @default.
- W4205651193 doi "https://doi.org/10.1016/s0016-0032(21)91511-4" @default.
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