Lick Observatory Bulletins Volume 278-317
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Lick Observatory Bulletins Volume 278-317

Lick Observatory Bulletins Volume 278-317


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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. 1918 Excerpt: ...that of a gaseous body of uniform density and radiating power, shining by its own light, and neither absorbing nor occulting light. In the image of this purely hypothetical body, as projected on a plane, the intensity of the light from any part would be proportional to the equivalent depth of gas at that point. The intensity of the light from any one point in the projected object relative to that from any other may be obtained from the photographic image. We shall waive for the present the difficulties presented by the uncertainty of the law governing the darkening of a photographic emulsion by light, and see how the darkening may be measured. The apparatus used for this section of the work is the Hartmann microphotometer11. The method of measurement requires a set of standard squares impressed on the same plate as the image to be analyzed. Since the data desired in the problem at hand are purely relative, this does not seem necessary. On the n The general principles of this instrument are described in the Astrophysical Journal, 10, 321, 1899. other hand, in order to obtain any accurate relative values, the secondary wedge must be calibrated. For this purpose, the photometer wedge was tested by means of several "standard squares" plates. A series of careful tests showed that the wedge of the photometer was linear throughout the range used in the measures. This fact greatly facilitates the measurement of any plate. If a point A on the photograph under analysis corresponds to a setting 23 on the wedge, and a point B to one of 27, we can say at once that B is 4 units darker than A. Since the work in this problem is purely relative, the value of these units is a matter of no consequence. The scale of the Crossley reflector plates of the two nebulae is...


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Product Details
  • ISBN-13: 9781130013214
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 86
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1130013219
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 168 gr

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