II. A general theorem in electrostatic induction, with application of it to the origin of electrification by friction

Abstract

This paper contains the results of an investigation into the question: If a dielectric be brought into a field of electric force, and there its specific inductive capacity is changed, what will be the electrical condition of the dielectric ? The subject has occupied me both in its theoretical and experimental aspects for a considerable time, and I believe that the answer to the question throws light upon some fundamental electrical phenomena. This investigation has led me to a general theorem in electrostatic induction which may be stated as follows:— When a dielectric is brought into a field of electric force and the specific inductive capacity is there altered, in general the dielectric becomes electrified.