English: Charles Greeley Abbot, astrophysicist and Secretary of the Smithsonian, with his device: a silver-disc pyrheliometer which measures direct beam solar irradiance
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=={{int:filedesc}}== {{Information |Description=Photos displaying on either side of this one in the Prints & Photographs Online Catalog may yield clues—view the neighboring photos: [http://www.loc.gov/pictures/related/?&pk=hec2008003390&st=gallery&sb...
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