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Correspondence, manuscripts, documents, and some miscellaneous printed materials. The bulk of the correspondence files, bound in sixteen volumes, deals with "..weights and measures, the textile tariff, and other subjects" for the period 1902-1929. There are three volumes of typescript copies (carbons) prepared from Dale's holograph diaries, 1887-1929, with an index in volume one. Among the manuscripts are the following: an account book kept by Samuel Dale of Carncastle, Ireland and Little Falls, N.Y., 1810-1834; and two volumes of Thomas Dale's accounts, Little Falls, N.Y., 183?-1856. These were written by Dale's grandfather and father respectively. There is also the minutes book of the American Metrological Society, 1873-1886 and an English tally stick dated 1377.

The Union Settlement Association Records document a century of the settlement's activities, and provide a unique view of the first wave of the settlement movement in America. They document social conditions, demographic change, political activity, philanthropy and social work in East Harlem with a strong emphasis on the urban renewal period of the 1950s and '60s. The records include: annual reports, board minutes and committee files, headworker and executive director files, program reports, community organization files, and visual materials such as photographs, maps and architectural drawings.

The records include annual reports, correspondence, memos, minutes, program files, news clippings, administrative records and photographs. They document the agency from its origins in a committee led by the Lenox Hill Neighborhood Association to its work during the 1990s providing social services to thousands of East Side residents. The founding and early history of the Stanley M. Isaacs Neighborhood Center are best documented by minutes in Series II, showing the collaboration between the New York City Housing Authority and the Lenox Hill Neighborhood Association to establish the agency. They also offer the most comprehensive view of administrative, fundraising and program decisions from the early years to the 1990s. This series is supplemented by architectural drawings and plans for the community center in Series VI. Program records in Series V focus on the period 1980-90, with a few items from the 1960s and '70s. The agency's fundraising efforts are documented in Series III, which includes correspondence with foundations and individuals, donor lists and committee files.

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