Word: spectras
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...lens this Bruce telescope, being but 24 inches, is much smaller than many now in use in this country yet in many respects it will be the most powerful ever constructed. Its chief point is its adaptibility for use in the construction of maps and study of the spectra of the faintest stars. It will remain in Cambridge some time before being sent to Peru...
Among the gifts for immediate use are the following: an additional sum of $10,000 from Mrs. Henry Draper of N. Y., to be expended by the Director of the Observatory in prosecuting the researches in the photography of stellar spectra, with which the late Dr. Henry Draper's name is honorably associated; subscriptions towards the construction of a fire-proof building for storing valuable manuscripts and photographic plates at the Observatory, paid to Aug. 1st, '91 amount to $1800; subscriptions paid to Aug. 1st, '91, amount to $4,100 for cases and furniture for Prof. Cooke's addition...
...obtained. The negatives were sent to Cambridge and are now stored with other valuable collections which have been made from the observatory at Cambridge. These latter observations have been taken photometrically and micrometrically, requiring constant use of the instruments. Nearly 4,000 photographs have been made, embracing the spectra of all the stars visible in Cambridge. Among the collection are a series of negatives, representing the condition of the sky for the past six years, and they are supposed to be the most complete set that exists. The six-inch telescope has been used for observing the variable stars...
...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...