Photographs of Stars, Star-Clusters and Nebulae: Together with Information Concerning the Instruments and the Methods Employed in the Pursuit of Celestial Photography
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.
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List op the Plates
Epoch op the Fiducial Stars A D 1900
Utility op the Photographic Charts
Method por testing the stability op a Photoinstrument
Description op the Photographs and references concerning them see List of Plates
15th magnitude 20-inch reflector 24 seconds Canum Venaticorum centre charts Cluster Messier Co-ordinates covers the region cross-wires Cygni dark lane dense nebulosity describes the cluster describes the nebula drawing epoch a.d. faint nebulosity Fiducial stars marked following side globular clusters guiding telescope Herschel Phil irregularly round ISAAC ROBERTS long exposures Lord Rosse Obs Lord Rosse Phil Majoris marked with dots Messier 101 Messier 36 Messier 52 Messier 94 millimetre to 24 minutes of arc multiple stars Nebula Messier negative ninety minutes north preceding observations photo-plate photo-telescope photograph covers Photograph shows photograph was taken plate during four plate during ninety plate during three preceding side REFERENCES reflector on December reflector on February refractor region between R.A. ring Scale—1 millimetre seconds of arc shown shows the nebula sidereal time 2h south following star image star-like condensations stars 10th stellar nucleus Trans visible