Word: spectra
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Dates: during 1880-1889
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...work at the observatory this summer has consisted chiefly in photographing spectra of stars with an eleven inch refracting telescope, and in experimenting with several new instruments. Among others, a fifteen-inch reflecting telescope, made and presented by the late Henry Draper, is worthy of mention. It is now being used for photographing stars...
...photometric observations, especially in classifying the stars into three groups, those visible to the naked eye, the catalogue stars or those from the sixth to the ninth magnitude, and those from the ninth to the fourteenth magnitude. It will also be valuable for the study of nebulae and Stella spectra, observations of occultations and observations for position...
...Bailey will go from California to Peru where a branch of the Cambridge observatory is to be established for the purpose of studying the spectra of the stars in the southern heavens, which are not visible in Cambridge...
...stars will be performed with the same instrument and according to the same method and standard as that by which that part of the heavens visible in Cambridge, from the pole to 30 degrees south of the equator has been already surveyed. Photographs will be made of the spectra of the southern stars and of the stars themselves directly. A complete map of the southern field will be made by combining a series of photographs taken in a systematic manner...
...which is to be the observatory of the party; the scarcity of wood and carpenters in Peru makes it prudent to build this here. The class of work which the expedition will undertake comes under the terms of the Boyden bequest. The cost of the work upon the Stella spectra is sustained by the Draper Memorial Fund...