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Miscellaneous Scientific Papers of the Allegheny Observatory of the University of Pittsburgh Volume 1-2

Miscellaneous Scientific Papers of the Allegheny Observatory of the University of Pittsburgh Volume 1-2


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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. 1910 Excerpt: ...various effects those which have heretofore received most attention are (3) and (7). Temperature variations are. indeed, our greatest source of trouble and error in the great majority of physical measurements of all kinds. It appears, however, from the results of the investigations on this point (pp. 26-28), that these effects are of even larger order of magnitude than is ordinarily assumed, and that in spectroscopic work particularly we must guard against them with the greatest care. As was pointed out on pp. 12, 13 and 26-28, the best method of eliminating residual effects, after reducing the temperature variations to the smallest possible range, is to measure the separation of the images and determine the so-called constants of the instrument, i. e., focal length, pitch of measuring screw or scale, etc., simultaneously with each observation, instead of relying on values determined once for all at considerable intervals, as is usually done. This method of simultaneous record is carried out most completely at present in determining star places by the chart photographs of the Astrophotographic Survey, in which the constants of reduction for each plate are determined from the photographic record on the plate itself. The next best example is that of the spectrographic method of determining absolute wavelengths and motions in the line of sight by the use of comparison spectra. The only criticism to the present practice of the method in the latter case is that the record of the comparison spectrum and of the spectrum to be measured is not simultaneous, and in the case of star spectra, in which an interval of sometimes two hours intervenes between the records, the residual errors of intermediate temperature variations, small though they may be, are in certain ca...


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Product Details
  • ISBN-13: 9781236313508
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 132
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 123631350X
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 249 gr

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