Abstract
In the spring of 1889 Professor J. J. Thomson published a description of some experiments made by him for comparing the resistances of electrolytes to the passage of very rapidly alternating currents, the method consisting in comparing the thicknesses of layers of different electrolytes which were equally opaque to Hertzian radiation. Duringlast winter I made trial of an arrangement identical in principle but more completely analogous to Hughes’ induction balance. The method seemed, however, to offer several difficulties and disadvantages, and finally I adopted another, also, one may say, analogous to Professor Thomson’s, inasmuch as it measures transparencies, but in outward appearance completely different from his.

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