Abstract

Experiments were carried out to test the equivalence of intermittent exposures of the same average intensity for cases in which the flash period varies over the range 10−8 to 10−7 second. The exposures were made by means of a mirror mounted on top of a high speed air turbine. The results are in agreement with those obtained in former investigations made at longer flash times to the effect that above the fusion frequency of flash, intermittent exposures of the same average intensity are independent of the speed of flash.

© 1936 Optical Society of America

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