Relative Intensities of the Magnetic and Electrostatic Illumination Components in the Electrodeless Discharge

Abstract

Recent theory indicates that a considerable portion of the illumination in the electrodeless discharge is due to the electrostatic field. A discharge vessel was constructed to test this point experimentally. Obstructions were set in it with the idea that each type of discharge would cast its own shadow. Distinct shadows were obtained for both discharges when acting separately. When the magnetic field predominated and the ring discharge was fully formed no evidence was obtained of shadows due to electrostatic discharges, and conversely, as is shown by the photographs that accompany the article. The intensities of the two illuminations, as judged by the times of exposure, varied about as 1 to 50. The photographs seem to support the calculations of Sir J. J. Thomson.