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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 collection consists of (1) A group of early materials written between 1903-1905, before Rank met Freud. This includes 4 daybooks, a notebook of dreams, a notebook of poems, the manuscripts of "Der Kunstler;" (2) Correspondence between Freud and Rank between 1906-1924, including the controversy over THE TRAUMA OF BIRTH. 40 a.l.s. from Freud and typed copies from Rank, with a few letters to and from Ferenczi (3) Copies and some originals of the circular letters by members of the inner circle, Ernest Jones, Abraham, Eitingon, Ferenczi, Rank and Freud, 1920-1924 (4) Original handwritten manuscripts, typed copies, notes and corrections of Rank's major works (5) Rank's own listing and comments on his writings and publications (to 1930) (6) Rank's published works--20 titles.

Correspondence, manuscripts of poems, and manuscripts of lectures by Benjamin. The correspondence consists of original letters of Benjamin, typescript and photostatic copies of Benjamin letters in other libraries, and letters to Benjamin from some of his literary contemporaries including Paul Hamilton Hayne, Willis Gaylord Clark, John Lothrop Motley, and Fitz-Greene Halleck. Many of the letters relate to Park Benjamin's lecture tours. There are other family letters and many documents relating to the Benjamin family,and two letterbooks of John Lothrop Motley. Also, a large amount of genealogical material of the Benjamin family, and its related families from the 16th century to the present day. There are also financial records, monographs, clippings, and photographs.

Correspondence, playscripts, screenplays, scenarios, short stories, and other manuscripts, drafts, photocopies, contracts and other documents, tearsheets, clippings, and other materials relating to his career as a screenwriter, playwright, and author of short stories. Correspondence with friends, students, admirers, and professional colleagues concern his teaching, playwriting, films, articles, photography, and literary topics. There are also two groups of letters from students and readers about his textbook, "The Human Nature of Playwriting" (1949). Among the cataloged correspondence are William Gibson, MacKinlay Kantor, Anna Louise Strong, Louis Untermeyer, and Carl Van Doren. Included are manuscripts, drafts, or photocopies of almost all his films, plays, and short stories, such as playscripts and drafts of his plays, "The Jazz Singer" (1922), "Skylark" (1939), "Jason" (1942), and others; screenplays and scenarios, many in photocopy, of "Trouble in Paradise" (1932), "The Merry Widow" (1934), "The Shop Aroung the Corner" (1940), "Suspicion" (1941), "Heaven Can Wait" (1943), and many other films; and manuscripts, drafts, tearsheets, and printed copies of his short stories and articles of film and television criticism. There are also many clippings and reviews, programs, and other printed materials about his plays and films.

Letters written to Gay from political and literary contemporaries such as Horace Greeley, Charles Sumner, and William Bryant; reports in letter form from his reporters at the front during the Civil War; and personal correspondence including many letters from his wife, Elizabeth Neall Gay. Letters written to Mrs. Gay from family friends and business associates including many from her husband. Correspondence of other members of the Gay family including Walter Gay, Sarah Gay, and Allan Gay. Diaries, notebooks, and journals of Sydney Howard Gay.