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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 files of the Declaration of Atlantic Unity. The declarations which they issued are in the box of printed materials (No. 49)

This collection contains the correspondence, typescripts, production files, and financial records of the Encyclopedia of Philosophy (1967). The correspondence is between the editorial staff and the entry authors. The Entries series contains typescript drafts (with holograph corrections) of the articles included in the encyclopedia. Production files contain lists of the members of the Editorial Board, indexes, and table of contents of the encyclopedia. Financial records include ledgers of monthly expences (1962-1964) and monthly production progress reports. One box of closed/restricted files is at the end of the collection. Gaps in the alphabetical sequence indicates files not received

The files of Curtis Brown, Ltd. literary agency include correspondence with authors, publishers, and other agents and deal with the editing and publishing of trade and textbooks, serial rights, reprints, dramatic rights, translations and foreign rights, promotion and copyright registration. For each author there are contracts, royalty statements, tax statements, and other financial materials. There is also a contract file, including cancellations and related correspondence, from 1914 to 1988. Among the cataloged correspondents are: Louis S. Auchincloss, W.H. Auden, Erle Stanley Gardner, Robert Graves, Ogden Nash, Ayn Rand, and Sloan Wilson.