Abstract

The results of measurements of reciprocity law failure at 20°C and at −186°C are given for two different high speed panchromatic emulsions, one low speed unsensitized emulsion, and one high speed orthochromatic emulsion. These measurements, covering the range in exposure time from 116 second to 17 minutes 4 seconds, show that in each case the reciprocity law failure, at both high and low intensity, is normal at 20°C, but has disappeared entirely at −186°C. These results are in complete agreement with those recently published by Berg and Mendelssohn.

© 1939 Optical Society of America

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