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A study has been made of the characteristic effects of the inert gas, and of variations in the dimensions of the cathode, on the minimum pressure at which the Schuler discharge may be started and maintained. Partially closing the open end of the cathode was found to have a very beneficial effect. An interesting example of rotating anode spots, observed incidentally, is also described.
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Voorhis et al. (1941) studied this question.
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