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Transactions of the International Astronomical Union, Volume 9 - 1957

Contents

Page 6 of 7

I. Joint Discussion on Solar Flares

Part IV Joint Discussions

  • 11. Summing Up

  • M. G. J. Minnaert
  • Published online by Cambridge University Press:
    11 July 2017, pp. 669-670
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  • 12. Contribution to the Discussion

  • K. O. Kiepenheuer
  • Published online by Cambridge University Press:
    11 July 2017, pp. 670-671
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  • 14. Contribution to the Discussion

  • M. Waldmeier
  • Published online by Cambridge University Press:
    11 July 2017, p. 672
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  • 13. Contribution to the Discussion

  • E. R. Mustel
  • Published online by Cambridge University Press:
    11 July 2017, pp. 671-672
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II. Joint Discussion on Photo Electric Image Tubes and their Astronomical Applications

Part IV Joint Discussions

  • 1. Les Convertisseurs D’Images

  • A. Lallemand
  • Published online by Cambridge University Press:
    11 July 2017, pp. 673-676
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  • 2. Information Storage and Integration Applied to Low-Contrast Astronomical Images

  • G. A. Morton
  • Published online by Cambridge University Press:
    11 July 2017, pp. 676-681
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  • In observational astronomy one is continually faced with the problem of interpreting faint images which are close to the limit of recognizability. The problem of threshold recognition of images at low light levels may be subdivided into two cases: (1) the limit of detectability of an image against a black background, and (2) the minimum perceptible change of illumination which can be detected at small but finite light levels. Until such time as the much-discussed space platform is launched into its orbit around the Earth, the astronomer must be content to view astronomical objects through a thick layer of relatively luminous air. Therefore, the second type of problem, namely that of a low-contrast image, is the main consideration.

  • 3. The Detection of Faint Images Against the Sky Background

  • W. A. Baum
  • Published online by Cambridge University Press:
    11 July 2017, pp. 681-687
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  • 4. Image Converters in Stellar Spectroscopy

  • W. A. Hiltner
  • Published online by Cambridge University Press:
    11 July 2017, pp. 687-690
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  • 5. The Application of Image Tubes to the Photography of Planets

  • Russell Morgan, Ralph Sturm, Albert Wilson
  • Published online by Cambridge University Press:
    11 July 2017, pp. 690-693
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  • 6. Some Applications of Image Converters in the U.S.S.R.

  • V. I. Krassovsky
  • Published online by Cambridge University Press:
    11 July 2017, pp. 693-695
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  • 7. Comparison of Image-Tube Systems

  • A. D. Code, R. H. Hardie
  • Published online by Cambridge University Press:
    11 July 2017, pp. 695-696
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  • 9. Joint Committee on Image Tubes

  • J. S. Hall
  • Published online by Cambridge University Press:
    11 July 2017, pp. 697-698
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  • 10. Investigations of Image Detectors

  • P. B. Fellgett
  • Published online by Cambridge University Press:
    11 July 2017, pp. 699-702
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  • Other Papers and Discussion

  • Published online by Cambridge University Press:
    11 July 2017, pp. 702-703
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  • Among the informal reports of research presented during the afternoon session, five are summarized on the preceding pages in papers 6, 7, 8, 9 and 10. The others, for which no manuscripts were prepared, included discussions by Morton, LaUemand, and Hiltner.

III. Joint Discussion on Fundamental Stars

Part IV Joint Discussions

  • 1. Report on the Revision and Enlargement of the FK3

  • A. Kopff
  • Published online by Cambridge University Press:
    11 July 2017, pp. 704-705
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  • 2. FK3, N30 and Pulkovo Absolute Catalogues

  • A. A. Nemiro
  • Published online by Cambridge University Press:
    11 July 2017, pp. 705-709
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  • 3. Meridian Work at the Royal Greenwich Observatory

  • H. Spencer Jones
  • Published online by Cambridge University Press:
    11 July 2017, pp. 709-711
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  • 5. Remarks Concerning N30

  • H. R. Morgan
  • Published online by Cambridge University Press:
    11 July 2017, p. 712
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  • 5. Fundamental Work at Washington

  • F. P. Scott
  • Published online by Cambridge University Press:
    11 July 2017, pp. 713-717
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Page 6 of 7