XXIII. On the determination of the number of electrostatic units in the electromagnetic unit of electricity

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Abstract
The values which various physicists have found for “ v ,” the number of electro­static units in the electromagnetic unit of electricity, differ so widely from each other that it seems important that additional experiments should be made in order to help to determine the value of this important constant. Six determinations of “ v ” have been published. The first determination was made by Weber, who measured the capacity of a condenser, both electrostatically and electromagnetically. Hockin and Professors Ayrton and Perry have also determined “ v ” in this way. Maxwell determined it by balancing the electrostatic attraction between two discs maintained at different potentials against the repulsion between electric currents circulating at the back of the discs, the currents being derived from the battery which maintained the discs at different potentials. Sir William Thomson and Mr. Shida have determined it by measuring an electromotive force both electrostatically and electromagnetically.

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