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Annals of the Astrophysical Observatory of the Smithsonian Institution Volume 2

Annals of the Astrophysical Observatory of the Smithsonian Institution Volume 2


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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ... the sun actually in the zenith, it is necessary to determine this reading by a small extrapolation from values actually observed, and the best result of such an extrapolation is to be obtained by multiplying together columns 4 and 5 of Table 14. Accordingly, the product of these two columns divided by column 17 gives the true transmission for total solar radiation given in column 19 of Table 14. Its mean value for Washington is 0.701 and for Mount Wilson is 0.818. The ratio of the transmission, according to Pouillet's method, to the true transmission may be obtained by dividing column 17 by column 5 in Table 14, and this ratio will be found for each day of observation in column 18. The mean ratio for Washington is 1.124 and for Mount Wilson 1.093. 7. THE MEAN TRANSMISSIBILITY OF THE ATMOSPHERE ABOVE MOUNT WILSON AND ABOVE WASHINGTON FOR HOMOGENEOUS RAYS OF DIFFERENT WAVE-LENGTHS. Atmospheric transmission coefficients for a few different wave-lengths have been given in Table 14. A table of mean transmission coefficients for Washington and Mount Wilson, respectively, including a large number of separate wave-lengths, will now be given. It has been prepared by taking the mean of the results for each of the several wave-lengths as observed on twenty different days at each of the stations. These days have been selected over a wide range of time, including more than one year in each case (though the Mount Wilson values represent the conditions from May to October only), and chosen with the particular aim to represent fairly the different degrees of transparency observed. During each of the days included, the atmosphere remained apparently in a nearly uniform state of transparency. Many days occur, of course, when the sky is less transparent...


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Product Details
  • ISBN-13: 9781230169835
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 96
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1230169830
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 186 gr


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