III. On the electric effect of rotating a dielectric in a magnetic field

Abstract

It was shown by Faraday in 1831 that an electromotive force is induced in a conductor moving in a magnetic field so as to cut the lines of magnetic force. The object of the experiments described in the present paper was to see if a similar effect exists in a dielectric when it moves in a magnetic field, and to measure the amount of the effect if it were found to exist. According to Maxwell’s electrodynamic theory, as developed by H. A. Lorentz and by Larmor, such an electromotive force should be produced in a dielectric, and should be equal to the electromotive force in a conductor multiplied by the factor 1 — K -1 , where K is the specific inductive capacity of the dielectric.