  THE CROSSLEY REFLECTOR OF THE LICK OBSERVATORY. [1] NOTE. In the original negatives of subjects 10 and 12, there are faint dark rings immediately surrounding some of the stars in the denser parts of the nebulosity. This effect has no doubt been accentuated in the subsequent photographic processes. On the plates of these two subjects in the completed volume, these rings are very distinct and give rise to a suspicion that the effect has been enhanced by the engraver. A critical examination of the prints seems to confirm this view. In the original proofs these rings were inconspicuous and were not noticed. The processes of steel-facing and printing appear to have increased the effect markedly, as it is much stronger on the sheets printed for the edition than in any of the early proofs. Inasmuch as these effects were not and could not be discovered until the sheets were assembled in Sacramento for binding, it has not been thought desirable to delay the issue of the volume for several weeks additional in order to have new plates and new prints of these subjects made by the distant engraver. Lick Observatory, Plate 10 The Great Nebula in Orion UNIVERSITY OF CALIFORNIA PUBLICATIONS PUBLICATIONS OF THE LICK OBSERVATORY PRINTED BY AUTHORITY OF THE REGENTS OF THE UNIVERSITY VOLUME VIII
As a Tribute To the Memory of JAMES EDWARD KEELER and in recognition of his great worth as a man and as an astronomer, the plates for this volume have been provided by
ORGANIZATION OF THE LICK OBSERVATORY.
PHOTOGRAPHS OF NEBULÆ AND CLUSTERS, MADE WITH THE CROSSLEY REFLECTOR, BY JAMES EDWARD KEELER, DIRECTOR OF THE LICK OBSERVATORY. 1898-1900. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
