Hammond, John Hays 1888-1965 creator mixed material monographic eng 6,000 19 1 7 Correspondence, notebooks, technical papers, legal briefs, chronologies, printed matter, sketches, annotated photographs, and other papers relating to Hammond's scientific career and inventions. Subjects include Hammond's basic experiments in radio control, frequency modulation, intermediate frequency, triode electron tube, and the Elmer Ambrose Sperry dispute on inertial guidance patents. Correspondents include Ernst Fredrik Werner Alexanderson, Alexander Graham Bell, Lee De Forest, Irving Langmuir, and Nikola Tesla. Open to research. Inventor and scientist. Collection material in English. Finding aid available in the Library of Congress Manuscript Reading Room and at http://hdl.loc.gov/loc.mss/eadmss.ms010036. Alexanderson, Ernst Fredrik Werner 1878-1975 Correspondence Bell, Alexander Graham 1847-1922 Correspondence De Forest, Lee 1873-1961 Correspondence Langmuir, Irving 1881-1957 Correspondence Sperry, Elmer Ambrose 1860-1930 Tesla, Nikola 1856-1943 Correspondence Electron tubes Inertial navigation systems Patents Radio Research Radio frequency modulation Inventors Scientists mm 78024703 hdl:loc.mss/eadmss.ms010036 hdl:loc.mss/eadmss.ms010036.3 http://hdl.loc.gov/loc.mss/eadmss.ms010036 http://hdl.loc.gov/loc.mss/eadmss.ms010036.3 Open to research. DLC 780830 20260227111624.0 mm 78024703