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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

Correspondence, reports, memoranda, news releases, photographs, sound recordings, financial records, and printed material. These files, more than three-quarters of which are in the Greek language, contain correspondence with Greeks, Greek-Americans, Greek officials, and diplomats, American congressmen, senators and other elected officials, print and media journalists, publishers, and other Americans regarding the dictatorship of the Greek colonels from 1967 to 1974. Also, routine requests for information on Greece, including the loan of audio-visual and pictorial materials, for use by journalists, teachers, students, publishers, etc. The files of letters dealing with the Greek Junta and Greek-American relations contain numerous photocopies of letters from American government and elected officials. Also included are nine sound recordings of Greek language broadcasts in the United States; pamphlets on Greece, and clippings from American newspapers on Greece and Greek-American relations; and photographs of one 1971 anti-Junta demonstration held in New York City. There are some financial records dating back to 1956, including account books, check registers, and cancelled checks.

Miscellaneous papers of James Nevins Hyde, Charles Cheney Hyde, and James Nevins Hyde. The collection includes monographs, account books, pamphlets, obituaries, and photographs.

Manuscripts by Payne, including plays, poems, journals, essays, account books, correspondence, letter books (to and from) including a large group of letters from Washington Irving. Also, pictorial material, scrapbooks, biographies, portraits, passports, and other documents; and materials on the Cherokee incident, 1835-1838, and Payne's arrest in Georgia. Other material include letters of various members of the Payne family and of related families. Of greatest interest is a group of fine letters and manuscripts of Eloise Richards Payne (1787-1819), a sister of the playwright. These present a sensitive and revealing portrait of the social, cultural, and political life of the time. Among the manuscripts and documents are many items of genealogical interest on the Paine, Shippen, Lynch, Luquer, and Lea families. Two boxes of the papers of Col. Thatcher Taylor Payne Luquer contain correspondence on various aspects of John Howard Payne's career, and on "An Unconscious Autobiography" the letters and diaries of William Osborn Payne (1783-1804), a brother of the playwright, edited by Col. Luquer.

Papers consist primarily of Smith's files relating to his architectural work containing correspondence with clients, colleagues, contractors, suppliers, and others, with related bills, notes, receipts, accounts, estimates, specifications, time sheets, progress reports, and architectural drawings. Also, portrait photographs of young people (possibly classmates?) in Rochester, N.Y. and Evanston, Ill., circa late 19th century; a class roll card, 1901, for a class taught by Smith at the General Society of Mechanics and Tradesmen, New York; a memo book, undated, containing miscellaneous accounts, sketches, memoranda; correspondence, 1890s, between Ella Smith (Smith's mother) and Lucien Smith and other family members, Rochester, N.Y., and Elmhurst, Ill.; account book, 1891-1902, of Mrs. H. V. (Ella) Smith, Rochester, N.Y.; calling cards, invitations, photographs, letters, bills, receipts, and other, miscellaneous personal documents; student drawings made by Smith when at Columbia University's School of Architecture; drawings for a proposed "academy of art and archaeology" in Rome, 1905-1906; and drawings for Malvina Hoffman's house and studio in New York City.

Architectural drawings and photographs of buildings designed by the firm dating approximately from its founding to the 1950s. Among those represented are buildings at the World's Columbian Exhibition, Chicago, 1893; Pennsylvania Railroad Station, New York, 1906-1910; restoration, 1903, of the White House, Washington, D.C.; buildings at Columbia University's Morningside Heights campus, New York; Boston Public Library, Boston, Mass.; E.W. Morgan mansion; Municipal Building, N.Y.; Col. Elliott Shepherd House, Scarborough, N.Y.; buildings at Amherst College, Amherst, Mass.; Bellevue Hospital, New York; various New York City residences; and others. Also included are competition drawings for the New York Public Library; miscellaneous drawings and sketches; photographs of the partners and of other members of the firm; lists of the firm's work; clippings of articles about the firm; lists of the firm's employees; billing records, 1953-1955; account books, 1940s-1950s; bank books, 1895-1955; award certificates; and other office miscellany.

Also, minutes kept by Richard Michell Upjohn for the American Institute of Architects, New York Chapter, Committee for Library and Publications, 1868-1877, and Executive Committee, 1867-1889; sketchbooks, 1850s-1870s; photographs of Upjohn buildings and portraits of Richard Upjohn; correspondence, wills, memorial tributes, manuscripts, printed material, and miscellaneous personal and business documents; and several drawings by other architects including Alexander Jackson Davis, Hobart Brown Upjohn, and Calvert Vaux