Abstract
As reported in NATURE of May 1, p. 752, considerable magnetic disturbance, presumably related to an active region of the sun containing some big sun-spots, began on April 24, and this terrestrial disturbance or series of disturbances was continued until about April 29d 0h U.T. The activity, as recorded at the Greenwich magnetic station at Abinger, includes four distinct disturbances or ‘storms', of which the most active periods and extreme ranges in horizontal force have been kindly supplied by the Astronomer Royal, as follows:
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