An instrument for sorting time-intervals into size-classes is described. It discriminates between intervals which differ in length by only a few tenths of one percent. This makes it possible to study the time distribution of the impulses in Geiger-Müller counters. Two argon counters, excited with gamma-rays and operated at rates between 0.9 and 3.0 counts/sec., gave results in excellent agreement with fluctuation theory; but a hydrogen counter, operating at rates between 1.9 and 4.5 counts/sec., and excited either with gamma-rays or with light, gave results so discrepant that they cannot reasonably be explained on the basis of statistical fluctuations or instrumental errors.
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Driscoll et al. (1940) studied this question.
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