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A collection of letters, manuscripts, and documents of prominent actors, actresses, and theatrical managers. Many of these are single, unrelated items. The largest body of correspondence is from the American actress, Charlotte Cushman (14 letters). Another figure of major interest is William Charles Macready, partly because of Miss Cushman's relationship to him (she toured with him for several years) and also as there are several of his letters. Sir Henry Irving, Edwin Forrest and James Mowatt are each represented by a few letters. A group of 8 unsigned letters may have been written by the famous singer, actress, and manager, Eliza Vestris. One box contains manuscripts of Samuel Coit, Charlotte Cushman, Clyde Fitch, Wallace Gould, Henry von Heiseler, E.H. Sothern, and Lester Wallack. Six boxes contain Augustin Daly's check stubs and bank books for Daly's Theatre, New York, for 1872-1899. (For additional Augustin Daly business records, see description sheets for Daly's Theatre Collection, X810.128/D15& the Dramatic Library Collection shelf list).

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

The files of the literary agency include correspondence with authors, publishers, and other agents and deal with editing and publishing, serial rights, reprints, dramatic rights, translations and foreign rights, promotion, copyright registration, contracts, royalty statements, tax statements, and other financial materials, and the personal affairs of many clients. Among the cataloged correspondents are: Louis S. Auchincloss, Erskine Caldwell, Herbert Gold, Alberto Moravia, Eleanor Roosevelt, and Rebecca West.