A Study of Electrostatically Coupled Circuits

The foregoing paper tells first of an investigation of the mathematical theory of electrostatically coupled circuits, and of the experimental verification of the conclusions drawn; and second, of the study, bymeans of the Braun tube and sustained oscillations, of the relations existing between the variables in the electrostatically coupled circuits using various values for the coefficient of coupling. It is found by theory and also by experiment that by one method of tuning, as the circuits are coupled closer, one wave length remains constant while the other approaches infinity, thereby concentrating an increasing proportion of the energy in the one wave. It is shown by curves and by Braun tube figures that when the ratio of the two wave lengths is a whole number, the root-mean- square value of the current is a maximum. A number of Braun tube photographs are given to show the relations between the various currents and voltages in the circuits.