There are drafts with annotations which are typically addresses or speeches. Many are standard publications written by E.H. These records are organized chronologically. The first box within this series contains the contents of a binder entitled "Instructions for Filing." These materials appear to indicate the manner in which Armstrong originally titled and filed various materials within his office and laboratory. Diagrams and notes on the regenerative circuit and superheterodyne can be found along with correspondence with Armstrong's sisters, Ethel and Edith, as well as his mother, Emily, and Charles Underhill, H.J. The remainder of the series is chronological with the general containing schematic drawings, notes and photographs. The catalogued correspondence is alphabetical by correspondent. This series is divided into the following five types of correspondence: general, catalogued, early, laboratory and carbon correspondence. 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 Roundġ990 ADDITION: Files from the firm of Cravath, Swaine& Moore. 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. More than half the files concern his many lawsuits, primarily with Radio Corporation of America, over infringement of the Armstrong patents. 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. 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. Series VI: Photographs, Negatives and Lantern Slides, 1886-1967.Series V: Records of Cravath, Swaine and Moore and Other Legal Firms, 1901-1982.Series IV: Alphabetical Files, 1886-1980.You will need to request this material from the Rare Book and Manuscript Library at least three business days in advance to use the collection in the Rare Book and Manuscript Library reading room. The following boxes are located off-site: 2-573. You can schedule an appointment once you've submitted your request through your Special Collections Research Account. You will need to make an appointment in advance to use this collection material in the Rare Book and Manuscript Library reading room. Armstrong, Edwin H (Edwin Howard), 1890-1954Įdwin H.
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