A discharge through a 500-cm3 bulb is short-circuited by a motor-driven commutator and the radiation and electrical characteristics of the afterglow are studied. R adiation at a definite time interval after the cutoff was observed by means of a sectored disk on the commutator shaft, while electrical measurements were made by closing a probe circuit momentarily by means of a second commutator.
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F. L. Mohler (1937) studied this question.