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Published online by Cambridge University Press: 15 September 2014
Of a number of absorbing and emitting systems subjected to radiation, the proportions which suffer given sequences of absorptions and emissions are examined. The simple results which follow when the proportions so affected are small are applied to the photographic action on the assumption that in exposure the grain acts as a single system. They indicate that the grain requires two absorptions in succession to render it susceptible to “full” development, and three absorptions with one intermediate “emission” to render it susceptible to “partial” development, the terms “full” and “partial” being defined. These results are found to apply over the whole range of wave-length tested, from 4800 Å. to below 2000 Å.
page 106 note * These Proceedings, 45, 1925, p. 166 ; 47, 1927, p. 34.
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page 119 note * In this plate the densities measured at 2003 did not exceed 0·3 ; but the results for q at lower densities agreed with those over a similar density range at wave-length 2857 Å.
page 120 note * Some unpublished counts of the numbers of large triangular grains containing nuclei after partial development, kindly sent by Dr Toy, show a well-marked intensity-scale limit of three. In most published results the counts do not cover the low percentages. Fig. 2a is unconvincing for this reason.
page 120 note † The curve shown has a limiting slope between three and four. Results for shorter exposures, involving new methods of working, are not yet available here, but the ratio of the time-scale to the intensity-scale limit for short exposures and partial development (the upper limit of Schwarzschild's index) is known to be 4/3.
page 126 note * Loc. cit.
page 126 note † Loc. cit.
page 126 note ‡ Loc. cit., ante.
page 126 note § Loc. cit., post.
page 130 note * Cf. F. E. Ross, Physics of the Developed Photographic Image, Eastman Kodak Co., 1924, p. 56.
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