Word: spectra
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Dates: during 1890-1899
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...astronomical observatory submitted its annual report to the visiting committee on Jan. 10. An urgent request is made for a fire proof building for the records of observations, valuable instruments and especially the collection of about 27.000 glass photographic plates representing the stars and spectra of both the northern and southern heavens, the results of observations in Peru. California and Cambridge. These are now stored in a frame building, the only one available where they could be destroyed by fire in a few minutes. Besides the plates there is a large collection of manuscripts which if once destroyed could never...
...spectra of several stars are being photographed at the observatory. The first of these spectra to be completed is that of Zeta Ursae Majoris. The spectrum of this star has been photographed at the observatory on seventy nights and a careful study of the results has been made by Miss A. C. Maury, a niece of Dr. Draper. The K line is clearly seen to be double in the photographs taken on March 29, 1887, on May 17, 1889, and on August 27 and 28, 1889. On many other dates the line appeared hazy as if the components were slightly...