Word: prisms
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Dates: during 1890-1899
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...photographs of the spectra of the stars taken at the Harvard College Observatory as part of the Henry Draper Memorial differ in two respects from those ordinarily taken elsewhere. Instead of using a spectroscope with a slit, in which but one star is photographed at a time, large prism is placed over the object glass of the telescope and thus spectra of all the bright stars in the field of view are obtained. The number of stars photographed simultaneously is still further increased by substituting for the object glass a portrait lens like that used by photographers, only larger...
...disks of glass for the projected Bruce photographic telescope have not yet been received from France, but the disk for the prism has been received and seems to be unusually free from defects. The important gift by Miss Bruce of six thousand dollars, to be distributed among astronomers of all nations should here be mentioned. It affords an example of using money so as to secure the greatest scientific return, which, it is hoped, will find many imitators...