Annals of the Astrophysical Observatory of the Smithsonian Institution (1900)
Washington : Government printing office · leaf 96
it seemed very desirable to establish in another part of the world another station cooperating with those at Table Mountain and Montezuma. As the Smithsonian Institution had not the means available, the project was brought to the attention of the officers of the National Geographic Society. After… … the necessary outfit, and to organize and conduct there, for a period of four years, a solar-radiation observatory cooperating with those of the Smithsonian Institution. The work requires a high-level, cloudless site, situated accessibly and in a region safe from attack by men and beasts. Freedom…
Infrared spectra · Solar radiation
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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