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This paper contains an account of some experiments which have been made during the last two years in the Cavendish Laboratory, Cam­bridge. These experiments were made to determine “v ” by comparing the electrostatic and electromagnetic measures of the capacity of a condenser. The condenser consisted of two cylinders fitted with guard-ring pieces. The electrostatic measure of the capacity was calculated from the dimensions of this condenser. The electromagnetic measure of the capacity was determined by a very slight modification of the method given in § 775 of Maxwell’s “Electricity and Magnetism.” In this method the condenser has to be repeatedly charged and discharged by a commutator, and a very elaborate commutator would be required to work the guard-ring part of the condenser; for this reason the capacity of the guard-ring condenser was experimentally compared with the capacity of another condenser without a guard-ring, the capacity of the latter being altered until the capacities of the two condensers were equal. The electromagnetic measure of the capacity of the condenser without a guardring was then determined by Maxwell’s method. The ratio of the electrostatic to the electromagnetic measure of the capacity isv 2 . The result of the experiments, using Lord Rayleigh’s value of the ohm, was that “v ” = 2·963 × 1010 in C. G. S. units.

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