Abstract
The method of measuring the horizontal component of the earth's magnetic force in absolute units devised by C. F. Gauss (Collected Works') will probably always be regarded as one of the most important contributions to the science of terrestrial magnetism. By its introduction magnetic forces were for the first time expressed in terms of the fundamental physical units. The principles of Gauss' method have continued in general use from 1836 up to the present time; but it seems likely that before long it will be superseded by simpler electrical methods.
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