A Further Study of the Inertia of the Electric Carrier in Copper

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Abstract
Nature of the experiments.—An apparatus similar to that of Tolman, Karrer and Guernsey, in which a copper cylinder is oscillated around its axis and the current due to the lag of the electrons in the cylinder detected by means of a secondary of many turns of fine wire connected through an amplifier with a tuned vibration galvanometer, has been used for a further study of the inertia of the electric carrier in metals. The method has been improved, among other ways by arranging to measure the direction, phase, and magnitude of the alternating current produced by the acceleration instead of merely determining the amplitude of the effect, as was done in the earlier experiments. The null method of balancing out the electromotive force of interest, introduced for this purpose, also had the advantage of eliminating the previous uncertain correction for the "zero effect." A thorough study of the effect of the earth's field on the moving cylinder was also made, which has not been previously done.