Abstract
About six years ago I communicated to the Society an account of some measurements made at Eskdalemuir Observatory of the more minute changes which are almost continually occurring in the vertical component of the earth's magnetic field. The method adopted was that of connecting the terminals of a coil of wire, whose axis is vertical, to a suitable galvanometer on which was measured the current induced in the coil by changes in the vertical component of the terrestrial field.
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