Sun-Spots and Terrestrial Magnetism

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Scientific paper

MR. B. G. JENKINS, in his letter to NATURE, vol. xvii. p. 260, says, ``I have ventured to state my belief that we are now passing through a long minimum period, one very similar to that which occurred at the close of last century''. It was the chief object of my communication to NATURE, vol. xvii. p. 183, to show the latter fact as far as the observations go up to the present time. I did not, however, venture in that article to make a guess as to the future, which really could have little weight till we have another year's observations. Yet I thought it desirable, nearly two months ago, to place in the hands of Prof. Balfour Stewart the evidence that the possibility of such an event, as an obvious conclusion from my results, had not escaped me. As Mr. Jenkins has published his guess, I may do the same with mine. The latter differs, however, from his in a very important way. He supposes the next maximum will be in 1887, whereas I suppose that the weak maximum of 1797 may be repeated near 1880. In this latter case the interval between the two will be nearly double that found by me (forty-two years), during which the sun-spot period appears to have all its different lengths.

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