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Edwin H. Armstrong papers, 1890-1972.

Author: Edwin H Armstrong
Edition/Format:   Archival material : English
Database:WorldCat
Summary:
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.
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Genre/Form: Audio cassettes
Audio tapes
Abstracts
Account books
Agreements
Annual reports
Applications
Articles
Bank statements
Bibliographies
Bills (financial)
Biographies
Blueprints
Briefs
Bylaws
Charters
Charts
Check stubs
Checkbooks
Clippings
Contracts
Diagrams
Dockets
Engineering drawings
Financial records
Glass plate negatives
Graphs
Indexes
Insurance policies
Inventories
Lantern slides
Lectures
Letters patent
Logbooks
Manuals
Maps
Memoranda
Notebooks
Notes
Patents
Petitions
Photonegatives
Photoprints
Powers of attorney
Proceedings
Regulations
Releases
Reports
Scrapbooks
Slides
Sound recordings
Statistics
Subpoenas
Surveys
Tax returns
Transcripts
Wills
Photographs
Named Person: Edwin H Armstrong; Warren E Burger; Vannevar Bush; Nicholas Murray Butler; Frederic R Coudert; Lee De Forest; Bernard De Voto; Thomas E Dewey; William J Donovan; Dwight D Eisenhower; James A Farley; Enrico Fermi; Herbert Hoover; Waldemar Kaempffert; Fiorello H La Guardia; Henry Cabot Lodge, Jr.; Robert Rutherford McCormick; Guglielmo Marconi; Thomas E Murray; William S Paley; Michael Idvorsky Pupin; David Sarnoff; Henry L Stimson; Leopold Stokowski; Arthur Hays Sulzberger; Frederick James Eugene Woodbridge; Owen D Young; Henry J Round
Document Type: Archival Material
All Authors / Contributors: Edwin H Armstrong
OCLC Number: 428643970
Language Note: Material is in English.
Description: 248 linear ft. (573 boxes, 30 flat folders, 10 phono discs, 5 tape reels)
More information:

Abstract:

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.

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