Contributions from the Mount Wilson Observatory Volume 1
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Contributions from the Mount Wilson Observatory Volume 1

Contributions from the Mount Wilson Observatory Volume 1


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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. 1908 Excerpt: ...indicates their behavior in spots.1 The amount of enhancement in the spark is given on a scale of oto 5. The list on the preceding page affords strong additional evidence for the conclusion that spark lines are weakened in the spectra of spots. FLAME LINES IN THE RED In view of the importance of accurate determinations of changes in line intensities in passing from the core of the electric arc to the flame, it has seemed desirable to take up this side of the investigation with a photometer especially adapted for the purpose. Accordingly, we have as yet made no systematic examination of the lines strengthened in the flame for the red region of the spectrum. A few cases, however, are so striking that they are deserving of comment. The following table indicates the behavior in this regard of two lines of calcium and two lines of sodium. The amount of strengthening in the flame as compared with the core of the arc is on a scale of o to 5. line that is strengthened in the spark, as compared with the arc, and this designation is now generally used in the literature of spectroscopy. No suitable name has been suggested for lines that are strengthened in the flame of the arc, where the "enhanced lines" are weakened. In any event, confusion is likely to result from the fact that the lines which have always been regarded as characteristic of sun-spots--those which are more conspicuous in the spot than in the solar spectrum--are not "enhanced" lines. On the contrary, they are lines that are strengthened in the flame; the "enhanced" lines are weakened in spots. In the present paper we have thought best to adopt the old terms "spark line" and "flame line" for lines strengthened in the spark or flame, respectively. It is, ...


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Product Details
  • ISBN-13: 9781130465570
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 102
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1130465578
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 195 gr

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