02433cpcaa2200457 4500 mm 78024703 DLC 20260227111624.0 cr ||||||||||| 780830|||||||||||| eng mm 78024703 ms 69002037 DLC DLC dacs DLC S lcmd Hammond, John Hays, 1888-1965. John Hays Hammond papers, 1908-1965 (bulk 1912-1953). 6,000 items. 19 containers plus 1 oversize. 7 linear feet. Arranged in 3 series. Series 1: Notebooks, 1912-1918; Series 2: General Case File, 1908-1965; and Series 3: Photographs, 1919-1955. Open to research. 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. 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. itoamc Scientists. itoamc Finding aid http://hdl.loc.gov/loc.mss/eadmss.ms010036 Finding aid (PDF) http://hdl.loc.gov/loc.mss/eadmss.ms010036.3 39894 39894