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Annals of the Astrophysical Observatory of the Smithsonian Institution (1900)
Washington : Government printing office · leaf 66
Plate VII, Annals Astrophysical Observatory, Volume III. … Details of Spectrobolometer at Bassour. 1. Shows bolometer, plane mirror, and driving mechanism. 2. Shows slit and rotating sector diaphragms.Infrared spectra · Solar radiation
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
More pictures from Annals of the Astrophysical Observatory of the Smithsonian Institution
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