Studies on Discharge

Abstract

The author describes the polarity effect of a special point electrode in this paper. Brush discharge is formed around the point electrode when it is positively charged and pointed corona when it is charged negatively. Then, voltage-current curves are plotted by ascending and descending voltages and it is found that the current of ascending voltage is smaller than that of descending. It seems that these phenomena are due to residual surface and pace charge.
In the next place, voltage-current curves are measured by using needle electrode and plate one, on which some kind of plate insulator is placed. In this case, the current of ascending voltage is greater than that of descending, and difference of these currents is the greater, the more residual surface charge on the insulator. Especially in the case of ebonite, plate, the stored surface charge has an extraordinary effect. Its polarity and that of needle electrode are equal, so that if amount of the surface charge reaches certain