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Photographs of Stars, StarClusters and Nebulae (Cambridge Library Collection Astronomy) (Volume 1),Used
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A geologist and fellow of the Royal Astronomical Society, Isaac Roberts (18291904) made significant contributions to the photography of starclusters and nebulae. By championing reflecting rather than refracting telescopes, Roberts was able to perceive previously unnoticed starclusters, 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 handdrawings. 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 twovolume 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.
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