Annals of the Astrophysical Observatory of the Smithsonian Institution (1900)
Washington : Government printing office · leaf 45
Annals Astrophysical Observatory, Volume III. Plate I. BOLOGRAPHS OF SOLAR SPECTRUM OF 60° ULTRA-VIOLET CROWN GLASS PRISM, a.— Smooth Curve of Measurement b.— Scale Changed, c— Zero Line. * — Shutter Interposed.
Infrared spectra · Solar radiation
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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