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• Identified! [Charles Greeley Abbot, astrophysicist and Secretary of the Smithsonian, with his device: a silver-disc pyrheliometer which measures direct beam solar irradiance] (LOC)

  • Uploaded by: The Library of Congress
  • License: No known copyright restrictions
  • 11 comments
  • 66 favorites
  • 28,809 views
  • Date taken: 1913
  • Date uploaded: 2015-10-02
  • Tags: libraryofcongress, dc:identifier=httphdllocgovlocpnphec04702, xmlns:dc=httppurlorgdcelements11, solarconstant, charlesgreeleyabbot, pyroheliometer, mysterysolved
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