XC.Theory of electromagnetic and electrostatic induction in electrodeless discharges

Abstract

View related articles 964 Prof. J. Kunz on ~lectromagnetic and within two external electrodes connected to the terminals of the solenoid.3. The circular component produces an increase of frequency. The effect of circular currents can be separated from the effect of axial currents. 4:. The intensity of the circular current and the phase difference between this current and the induced electromotive force can be determined from the magnitudes of frequency variations.5. As a consequence of the experiments it became evide~Dt that the theory of induction as given by J. J. Thomson may be applied only to special cases when the induced currents are large enough to produce a conductivity in the gas sufficient to shield the electrostatic field of the excitation ~oil.Following our investigation Prof. Chas. T. Knipp checked our results by qualitative experiments in which luminous effects due to the two current components were made visible by a method of shadows*. Not only do his experiments confirm the existence of circular and axial currents, but they visualize also the effect of simultaneous action of both currents in accordance with our theory.In the following paper Prof. J. Kunz gives a theoretic.d investigation which led to more general expressions for the current in the discharg~ tube as function of the primary excitation current and of frequency variations. References of other authors who investigated electrostatic effects in electrodeless discharges are included in that paper.Acknowledgment is due to the students (M. McGregor, R. L. Gougler, W. A. Laning, Jr., and D. E. Chapman) who at different times assisted in the experiments and measurements.

A study of high-current toroidal ring discharge

“…Knipp & Knipp (1931) were able to obtain a direct reading of the current in a ring discharge but only at the expense of greatly modifying the simple circular ring discharge. That the gaseous currents could be deduced from the increase in frequency caused by a ring discharge was shown by Tykocinski-Tykociner (1932) and Kunz (1932), but the experimental work of the former was spoilt by a longitudinal discharge occurring in his discharge tube. Esclangon (1934) measured the power dissipated in a ring discharge and deduced the gas current by applying the theory of the induction furnace.…”