Abstract

The effect of pressure on photographic sensitivity is studied with the monochromatic radiations of a quartz mercury arc for four different films of Eastman Kodak Company; namely, Kodalith film, motion picture positive film, commercial film, and portrait film. The quantity E/Ee, where E is the illumination actually used when the emulsion is under pressure, and Ee the illumination which would be required to produce the same optical density when the emulsion is under no pressure, is a function of pressure only and, for pressures greater than 250 kg/cm2, E/Ee is a linear function of the pressure. The variation of E/Ee with the wave-length of the radiations is very similar to that of the contrast for all the films studied. It is pointed out that the pressure effect on photographic sensitivity may be closely related to the absorption properties of the emulsion.

© 1936 Optical Society of America

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