Non-occurrence of thelight-effect in high frequency conduction at low potentials

Summary

Nolight-effect was observed when a chlorine-filled Siemens’ tube was fed at low potentials with currents of 5 to 12 megacycles frequency. Over the same current range, however, and instantaneous and reversiblelight-effect corresponding to 18 to 12 per cent. current decrease at 50 to 500 cycles frequency, and 9·6 to 7 kV applied potential respectively, was produced by light from an incandescent bulb. Fields large enough to cause ionisation by collision of the irradiated gas are considered to be a necessary condition for the production of the phenomenon.