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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

Manuscripts of essays and course notes taken while a student at Amherst College, 1884-1889, and at Berlin University, 1892-1894. Articles, addresses, essays, lectures, lecture notes and reading notes. Also included are diaries for the years 1936-1940 and correspondence concerning Amherst College, Columbia University, and Woodbridge's stay as a visiting scholar in Berlin, 1931-1932. Among his correspondents are: Frederick S. Allis, Secretary of the Amherst Board of Trustees; Stanley King, President of Amherst; and Nicholas Murray Butler, President of Columbia. Some photographs are also included.

Correspondence, manuscripts, notes, documents, course materials, organization files, photographs, and printed materials of John Herman Randall, Jr. Included among the cataloged correspondence are lengthy philosophical exchanges between Randall and Harry Elmer Barnes, Wendell T. Bush, John J. Coss, John Dewey, Irwin Edman, William Ernest Hocking, Corliss Lamont, Sterling P. Lamprecht, Arthur O. Lovejoy, Reinhold Niebuhr, Herbert W. Schneider, and Frederick J.E. Woodbridge, and in the uncataloged series, Horace Friess, James Gutmann, and Paul O. Kristeller. A separate series contains family correspondence consisting primarily of letters from Randall to his wife, Mercedes Irene Moritz Randall, during their courtship and early marriage. Randall's manuscripts include drafts of many of his articles and essays (a number of which became chapters in several of his books) as well as typescripts, proofs and related materials for many of his books, notably THE CAREER OF PHILOSOPHY, VOLUMES I-III, ARISTOTLE, THE MAKING OF THE MODERN MIND, NATURE AND HISTORICAL EXPERIENCE, PLATO, and THE ROLE OF KNOWLEDGE IN WESTERN RELIGION.

Correspondence addressed to the editors, Wendell T. Bush and Frederick J.E. Woodbridge, from numerous philosophers including John Dewey, William James, Josiah Royce, and George Santayana. There are two typewritten manuscripts of John Dewey: "The Naturalistic Theory of Perception by the Senses" and "Valuation Judgments and Immediate Quality" both of which contain the author's holograph corrections and emendations. Also, two manuscripts of Ernst Cassirer: "Kant and Rousseau" and "Ficino's Place in Intellectual History."