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| Keywords: Secretary Abbot with Solar Equipment.jpg en Astrophysicist and fifth Secretary of the Smithsonian Institution 1928-1944 Charles Greeley Abbot with his harmonic analyzer developed to discover and evaluate periodicities in solar variation Abbot is seen here sitting at a desk with the instrument in front of him There are charts of solar variation on the wall in front of him 2012-04-11 http //siarchives si edu/collections/siris_sic_8306 author PD-USGov Uploaded with UploadWizard Charles Greeley Abbot Harmonics Smithsonian Institution Archives | ||||
