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A collection of letters from authors, critics, and scholars, primarily relating to lectureships and courses given under the auspices of the English Department. Some of the correspondence, notably the ten letters from Amy Lowell, deal with essays written for the revised edition of C.D. Warner's LIBRARY OF THE WORLD'S BEST LITERATURE. The letters are written to Ashley H. Thorndike, John W. Cunliffe, George R. Carpenter, Ernest H. Wright, and Marjorie Nicolson. The correspondents include John Mason Brown, Marchette Chute, Robert P. Tristram Coffin, Padraic Colum, Bernard DeVoto, T.S. Eliot, John Erskine, Robert Frost, Otto Jespersen, Howard Mumford Jones, Joyce Kilmer, Ludwig Lewishon, Amy Lowell, Archibald MacLeish, Thomas Mann, Brander Matthews, H.L. Mencken, Christopher Morley, Ezra Pound, Theodore Roosevelt, Charles P. Snow, Allen Tate, Robert Penn Warren, and Edmund Wilson. Two boxes of miscellaneous uncataloged correspondence cover the years, 1896-1917, and a folder for the 1935 Mark Twain Centennial sponsored by the English Department. The correspondence is chiefly with Ernest Hunter Wright.

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

Correspondence, manuscripts, dispatches, documents, clippings and other printed materials concerning his career as an editor and correspondent for the New York Herald Tribune in Moscow, Berlin and New York, as a staff member of the Institute of Pacific Relations from 1932 to 1934, as deputy director in the Office of War Information overseas branch, 1941-44, as an owner and editor of the New York Star, 1948-49, as an instructor in communications at Sarah Lawrence College, 1950-1951, as a book editor at Simon and Schuster, Publishers, 1951-1970, and as an author and translator.