Abstract: An equal discriminability scale for flash light frequencies was constructed following the procedure as outlined by W. R. Garner and H. W. Hake, with some modifications in the experimental set up. The curve plotted with the data collected showed no "end effects", and proved to be identical with the curve of successive differential limen. It was also found that, within the range of 5—182 cycle per minute, the discriminability for flash light frequencies obeys the power law.

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