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9781108015226

A Selection of Photographs of Stars, Star-Clusters and Nebulae

by
  • ISBN13:

    9781108015226

  • ISBN10:

    1108015220

  • Edition: Reprint
  • Format: Paperback
  • Copyright: 2010-10-31
  • Publisher: Cambridge Univ Pr

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Summary

A geologist and fellow of the Royal Astronomical Society, Isaac Roberts (1829-1904) made significant contributions to the photography of star-clusters and nebulae. By championing reflecting rather than refracting telescopes, Roberts was able to perceive previously unnoticed star-clusters, and was the first to identify the spiral shape of the Great Andromeda Nebula. Roberts' use of a telescope for photographing stars, and a long exposure time, provided greater definition of stellar phenomena than previously used hand-drawings. Although Roberts' conclusions about the nature of the nebulae he photographed were not always correct, the book is significant for the possibilities it suggests for nebular photography. Published in London in 1893 and 1899, the two-volume Photographs of Stars represents the summation of his work with his assistant W. S. Franks at his observatory in Crowborough, Sussex. Volume 1 contains 51 collotype plates of stars, and descriptions of his instruments and methods.

Table of Contents

Preface
Isaac Roberts' observatory
Isaac Roberts' telescopes
List of the plates
List of the abbreviations
The negatives
Arrangement of the photographs
Epoch of the Fiducial stars (A.D. 1900)
A table for converting measurements in right ascensions into intervals of time
Illustrations of the method for determining the right ascensions and declinations of the stars
Introduction; Utility of the photographic charts
Refractors and reflectors as photo-instruments
Requirements and adjustments of a reflector for celestial photography
Collimation of the mirror
Essentials of a photo-telescope
Method for testing the stability of a photo-instrument
Photographic plates: their exposures and development
Description of the photographs and references concerning them
Deductions from the photographs
Table of Contents provided by Publisher. All Rights Reserved.

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