Abstract
Summary A clean tungsten cathode of small diameter was produced by burning out a tungsten filament. The auto-electronic currents from this cathode in a high vacuum were reproducible. The currents were decreased by hydrogen and still more by air ; they were increased by coating the cathode with barium. It is concluded that auto-electronic currents are not due to gas, but that they depend on the nature on the cathode in somewhat the same way as the thermionic emission.
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