The Observatory Volume Ñ‚. 12
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 Excerpt: ...at the same absolute time at widely different points of the Earth's surface. I have spoken of persons not having been convinced when Sabine first suggested relation between solar and magnetic...
Paperback: 184 pages
Publisher: RareBooksClub.com (May 9, 2012)
Product Dimensions: 7.4 x 0.4 x 9.7 inches
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changes. I have now to show you what is, I think, a curiosity, as illustrating how often there may be good reason to doubt. At the Royal Observatory at Greenwich we have an anemometer the motions of the vane of which are continuously registered. At the end of each year we determine the excess of the number of revolutions of the vane, in what we call direct motion, above the number of revolutions in retrograde motion, or vice versd. These annual values I have put in the form of a curve (see frontispiece), adding thereto the Wolf Sun-spot curve. During 17 years, 1858 to 1874, the two curves are in almost perfect agreement, the two maxima in each curve are simultaneous, the second maximum in each is also more pronounced than the first, and altogether the agreement is close. And yet there is no connection between these phenomena. The curves previously to 1858 and following 1874 are in no sort of agreement; but had it been possible only to have formed the middle portion of the diagram, the evidence for relation would have seemed to be very strong. The Astronomer Royal. I may just make a remark about the question of Mr. Mattieu Williams with regard to the correspondence of solar prominences. I quite appreciate the importance of comparing them with the faculse and sun-spots. In this climate there is great difficulty in getting anything like continuous observations of the prominences; and it is only in Italy that such observations are carried out with sufficient regularity to make the comparison trustworthy. Of course the results I have brought here are those obtained at Green...
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