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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

Autograph and typed letters from James Thomas Farrell to Schapiro, concerning Farrell's personal life, his writings, and current social and political affairs. There are also eight of Farrell's manuscripts from the 1960s. The long friendship of neighbors is seen in Farrell's personal letters about his private life and his family and in the discussions of whichever novel he was working on at the time. The main body of the correspondence is from the World War II period and shows much concern for current events in the Soviet Union as well as in the U.S. and Europe. The author also made a few forays into Irish humor, as in the use of his pseudonym, Jonathan Titelescu Fogarty. There are autograph drafts of Prof. Schapiro's replies to and notes about Farrell, and letters and post cards from Farrell's actress wife, Hortense Adler. Also, a letter from Frances Mitchell on her book, THE AWAKENING - LE REVEIL, 1950.