Identifier: smithsonianmisce821931sm (find matches)
Title: Smithsonian miscellaneous collections
Year: 1862 (1860s)
Authors: Smithsonian Institution
Subjects: Science
Publisher: Washington : Smithsonian Institution
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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ibutes much more than half the total (evenmore than two-thirds the total on cloudless days at the equator) emitsvery much lesser proportions as we approach the poles. The twosources are very difterent as regards wave lengths of principal contri-bution ; the atmosphere emitting mostly in the region exceeding 16/1.in wave length, the surface emitting principally in the region 9/u, to 13/A.If we sum up the results in the seventh and tenth columns, whichrepresent our own and Simpsons totals for half-cloudy sky, and as-sign weights to them proportional to the areas of earth which theyrespectively represent, we find that the earth as a planet radiates aver-ages of 0.277 or 0.265 cal. per square centimeter per minute accordingas our results or Simpsons are taken. If we compute the same quan-tity from the solar constant, 1.94 cal., and Aldrichs albedo, 43 per cent, the result is-^^ x 0.57 = 0.276 cal. The discrepancies are very4 small and far within the probable error of the determinations. I
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