Word: spectra
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Dates: during 1890-1899
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...large portion of the investigatory work has been in the field of stellar spectra. Professor Pickering, in conjunction with others, has derived a new method of determining the relative motion of two stars in the line of sight. The method depends on the calculation, by means of photographic plates, of the relative variation in the position of the spectra of the two moving stars. There is reasonable belief that this method will enable such calculations to be made with a degree of accuracy hitherto unobtainable. The spectra of many obscure stars have been carefully studied, and in some cases, peculiar...
...announcement has just come from the Harvard Observatory of the discovery of 14 new variable stars. These discoveries were made on examination of the Henry Draper memorial photograps of stellar spectra taken by Mrs. Fleming During last November an announcement of six new variables was made, and in last July of seven...
...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...