Letter | Published:



IN a letter to you last week Mr. W. H. Preece called attention to a sudden appearance of earth-currents on the 19th between 10.15 and 10.20 p.m. G.M.T., traces remaining until 10.50. A magnetic storm was in progress at the time, and had commenced shortly after 4 p.m. The declination magnet moved at first slightly towards the west; but the most rapid movement was towards the east, and commenced at 9.40, attaining its absolute minimum, or greatest E. elongation, at 10.9. It then returned as rapidly westward until 11 p.m., but the absolute westerly maximum was only reached at 6.50 the next morning. The whole range of the declination magnet was 53′.0.

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