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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, manuscripts and documents. Included among his personal and professional correspondence are letters from famous economists collected by Seligman. Among these are: I) William Shirley (Box 95). 1741-1745. Copies of letters and documents by Shirley, Royal Governor of Massachusetts, addressed chiefly to the Board of Trade, London; II) Paul Flobart (Box 96). RECHERCHES SUR LES BILLETS DE LA BANQUE DE LAW, 1716-1720. Lille, 1920. Notes, page proof and printed for of this pamphlet; III) John Francis Bray Papers (Box 97). Bray, 1809-1895, early socialist writer and labor agitator in England, 1822, returned to America in 1842. Michigan experiences, 1842-1896, papers 1860-1890; IV) Ernest Jones Papers. Correspondence, family and business papers of Ernest Jones, 1819-1869, English militant socialist and leader of the Chartist movement, and publisher of two newspapers propagating Marxist doctrines. Collection consists of ca.1,708 items, and some family correspondence and mementoes. The most valuable part appears to be his notes refuting various libel charges brought against him. In 10 boxes at the end of the collection

Correspondence, manuscripts, articles, book reviews, personal documents, clippings, scrapbooks and photographs relating to Lengyel's career and his research on the politics of Europe and Asia. Correspondents include Catherine Andrassy Karolyi, Mihaly Karolyi, H.L. Mencken, Ferenc Molnʹar and Leo Szilard. Of special note are Lengyel's extensive autobiographical writings, also outlines and manuscripts of his books including the unpublished "By Their Flame." There are clippings and photocopies of printed articles by Lengyel in English and Hungarian, published biographical information, book reviews and lecture programs. A series of scrapbooks contains clippings on the politics of Europe from 1920 to 1950.

This collection contains reprographic architectural drawings for the Empire State Building; photographs of the demolition of the original Waldorf-Astoria Hotel, which occupied the Fifth Avenue site; photographs of the Empire State Building under construction, circa 1930-1931 (one photograph shows former governor Alfred E. Smith standing in the building during construction), including 232 photographs by photographer Lewis Hine; photographs showing the building after completion, circa 1931-1956; scrapbooks of clippings of articles about the building, 1930-1957; and illustrations of the Empire State Building, circa 1930s-1960s. These subgroups of materials also have records in CLIO with more detailed descriptions of items; for these records, please search under "Empire State Building" or "Shreve, Lamb & Harmon" or "Hine, Lewis Wickes".

The collection consists of a small amount of correspondence (1942-1948) which revolves almost exclusively around Ernest Rope's efforts to teach Russian affairs at U.S. universities; one folder of personal documents, including letters of appointment, citations of merit, identity cards, and other items; manuscripts of articles and of a book length volume entitled "The Russia I have known;" and a diary, together with a photo-album, detailing his work in northern Russia and Estonia on behalf of the YMCA. The diary abounds with references to political and military events in northern Russia during the years 1919-1921.

Correspondence, manuscripts, memorabilia, photographs, and printed materials. The correspondence consists of letters relating to the publication and review of Jäckh's books, articles, and book reviews and typescript copies of letters by Hans Jäckh. There are manuscripts for his articles, lectures and speeches as well as clipping files of book reviews and articles by and about Jäckh in the European and North American press. The bulk of the collection is written and printed in German and deals with the Balkans and the Near East before 1920, including the Balkan War of 1912-1914, and the Turkish Revolution. Of particular interest are manuscripts and articles describing his land travels between 1903 and 1913 with the German fleet and on hot air balloons. Other topics covered include the Hocjschule für Politik, German labor unions, German-European relations, European attitudes towards the United States, and his literary works. There are also some manuscripts dealing with the Balkans and the Near East during World War II. An extensive file of photographs depicts, Albania, Asia Minor, Baghdad, the Balkans, Constantinople, Genoa, the German naval fleet, the Hochschule für Politik, hot air balloons, Italy, the Mediterranean, Turkey, the Turkish Revolution, the United States, Versailles, and Weimar. There are books from Jäckh's library, some with marginal notes, some signed and inscribed to him as well as copies of his own works.

Files of the ESCO Fund Committee, Inc. and its related foundations ESCO Foundation for Palestine and ESCO, Friends, Inc. The files contain correspondence, reports, clippings, Board minute books, photographs and ESCO publications. Among the correspondence are Stephen Wise, Theodore Kolleck, Ernest Bloch, and Leonard Bernstein. The collection also includes papers relating to Frank and Ethel Cohen's personal (i.e., non-ESCO) Zionist and Jewish interests.

Correspondence, poetry manuscripts, diaries, notebooks, address books, documents, photographs, and scrapbooks of clippings of Eugene Barry. The correspondence concerns his published poetry, the leather tanning business, and family affairs. The diaries reflect his active business life and travels from 1864 until 1926. There are photographs of members of the Barry, Clark, Wyman, and other related families, and of friends and actresses. The four scrapbooks contain clippings of poetry, obituaries, local news of Lynn, Mass., World War I, and other subjects. Among the correspondents are Thomas Wentworth Higginson, Henry Cabot Lodge, Ellen Louise Chandler Moulton, Booker T. Washington, and John Greenleaf Whittier.