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Annals of the Astrophysical Observatory of the Smithsonian Institution (1900)

Washington : Government printing office · leaf 151

An illustration from Annals of the Astrophysical Observatory of the Smithsonian Institution, 1900, leaf 151 — Annals Astrophysical Observatory, Volume II. Plate XV. Results of ''Solar-constant'' Measurements on Mount Wilson.

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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