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Special Publication Volume 1, PT. 5

Special Publication Volume 1, PT. 5


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About the Book

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. 1897 Excerpt: ... are frequently accompanied by auroral displays. Such storms may at times have a very wide circle of action and occur practically simultaneously over the whole area. Thus on December 3d, 1896, while I was on my way to Salisbury to establish a meridian line for Dorchester county, I saw in the evening a most brilliant aurora, and the next day while making magnetic observations the behavior of my needle plainly indicated that a magnetic storm was prevailing. I have since then received from a magnetic observatory at Bochum, Germany, established in connection with a mining plant, the tabulated hourly values of the magnetic declination during 1896 and I find that the magnetic storm of December 4 likewise made its appearance at this distant place. The deviations caused by these spasmodic fluctuations in the earth's magnetism may in these latitudes occasionally amount to as much as 10'-20' and even more. On October 12th, 1896, I made observations at Oakland at various times during the day. The diurnal variation on that day was completely reversed, the highest value occurring in the morning, instead of in the afternoon, and the lowest value in the afternoon, instead of the morning. My first observation in the morning required a correction of--16'. Small spasmodic fluctuations occur frequently. Thus, according to a list of more or less disturbed days from July to December of last year, as furnished by the Toronto Magnetic Observatory, we have: Tn July 17 more or less disturbed days. August 20 September... 19 October 14 November... 9 December.... 8 Fortunately for the surveyor, about 75-90 per cent of these disturbances were either small or they occurred at times when they would not appreciably affect his work. It is due largely to these irregular disturbances, the co...


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Product Details
  • ISBN-13: 9781231076729
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 42
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1231076720
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 95 gr

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