Abstract
IN this paper the author refers to the ordinary variations of the magnetic elements as observed at Greenwich; the annual progressive change; the diurnal variation—large in summer, small in winter, and also larger when sun-spots are numerous and smaller when sun-spots are few; the irregular magnetic disturbances and magnetic storms, and the accompanying earth currents; phenomena which are generally similar at other places.
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Magnetic Variations1. Nature 46, 67 (1892). https://doi.org/10.1038/046067a0
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DOI: https://doi.org/10.1038/046067a0