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Papers and correspondence including letters from leading intellectuals of the United States and Europe. Much of this correspondence pertains to the publication and critical discussion of his two influential works, MANHOOD OF HUMANITY : THE SCIENCE AND ART OF HUMAN ENGINEERING (1921) and SCIENCE AND SANITY : AN INTRODUCTION TO NON-ARISTOTELIAN SYSTEMS AND GENERAL SEMANTICS (1933).

Letters, manuscripts, and documents of the Bruce family concerning the business affairs of the George Bruce & Company Type Foundry of New York City. There are seven letters of David Bruce, Jr., his biography of David Bruce, Sr., and other manuscripts and letters concerning his invention of the first successful type-casting machine as well as the patent agreements for the invention. Also, a group of ten letters from Thomas N. Rooker of the NEW YORK TRIBUNE to David Wolfe Bruce (1824-1895). There are several letters which relate to George Bruce (1781-1866), the founder of Bruce Type Foundry, as well as his manuscripts on printing and related fields. The collection also contains material relating to the Bruce entry in the Paris Universal Exposition of 1867, the financial records of the firm, miscellaneous correspondence with other printers, and type specimens. In addition, there is a scrapbook of memorabilia containing clippings, receipts, typographic magazines, and specimens of printing.

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, typescripts, contracts, legal briefs, patents, and other documents, music scores, cartoons, technical drawings, account books, blueprints, photographs, clippings, printed legal briefs & transcripts, proofs, scrapbooks, and other printed materials of William M. Speer.