Abstract
STUDIES of the threshold potential1, V m, for low-frequency (50 c./s.) discharges in atmospheric air dried over phosphorus pentoxide were made over a range of pressure, p, from 1 to 75 mm. of mercury, using cylindrical glass tubes with plane parallel glass ends as electrodes. Vm was indicated by a sudden rise in the current flowing through the discharge tube, the initiation of a glow characteristic of the gas, and the appearance of high-frequency pulses on the current waveform.
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