Abstract
IN recent years, at Birkbeck College, attention has been given to various methods of measuring electrical resistance absolutely. On the eve of war, this series of researches has been brought to a conclusion by the development of a method in which the potential difference across a resistor is balanced by the average E.M.F.of a commutating generator. Although Rosa1, so far back as 1909, suggested such a method and proposed a form of apparatus, difficulties were encountered and no experimental data derived from any form of this method have been published. The method is attractive in requiring only the measurement of a frequency and a maximum mutual inductance.
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