Abstract
The counting rates due to two separate constant β‐ray sources and due to the two sources combined are measured. Because of the finite resolving time of the counter the sum of the counting rates due to the single source exceeds that due to the combined source. By application of formulae which are derived the resolving time and errors involved can be calculated from these quantities. Relatively high accuracy can be obtained by this method without excessive expenditure of time upon the measurements and without the use of very large counting rates which might damage the counter.

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