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Edwin H. Armstrong papers, 1886-1982 [Bulk Dates: 1912-1954]. 

Armstrong, Edwin H. (Edwin Howard), 1890-1954.
Phys. Desc: 
295.7 linear ft ( 573 boxes, 30 flat folders, 10 phono discs, & 5 tape reels).
Call Number: 
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Biographical Note

Edwin Howard Armstrong is one of America's greatest inventors and scientists. He was born in New York City on December 18, 1890 and died there on January 31, 1954. Armstrong is credited with a multitude of inventions in the radio communications field. He secured 42 patents throughout his career, of which the most well known are the regenerative circuit, superheterodyne circuit in 1918, the superregenerative circuit in 1922, and his complete frequency modulation system in 1933.

Scope and Contents

Professional and personal files including Armstrong's correspondence with professional associations, other engineers, and friends, his research notes, circuit diagrams, lectures, articles, legal papers, and other related materials. Of his many inventions and developments, the most important are: 1) the regenerative or feedback circuit, 1912, the first amplified radio reception, 2) the superheterodyne circuit, 1918, the basis of modern radio and radar, 3) superregeneration, 1922, a very simple, high-power receiver now used in emergency mobile service, and 4) frequency modulation - FM, 1933, static-free radio reception of high fidelity. More than half the files concern his many lawsuits, primarily with Radio Corporation of America, over infringement of the Armstrong patents. Litigation continued until 1967. Other files deal with his work in the Marcellus Hartley Research Laboratory at Columbia University, 1913-1935, and with the American Expeditionary Forces in France during World War I, his Air Force contracts for communications development, Army research during World War II, the Radio Club of America, the Institute of Radio Engineers, FM development at his radio station at Alpine, N.J., the use of FM in television, his involvement in Federal Communications Commission hearings and legislation, and his work with the Zenith Radio Corporation. Also, letters to H.J. Round. 1990 ADDITION: Files from the firm of Cravath, Swaine, & Moore. Files, dating from the late 1920s to the 1960s, pertaining to Professor Armstrong's litigation with Lee de Forest over the regeneration patents; his suit against RCA and other infringers of his FM patents; the original letters patent, among which are those for his FM system; and financial matters relating to the Armstrong laboratories, the FM station in Alpine, New Jersey, other real estate properties, and his estate.