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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, manuscripts, documents, financial records, memorabilia, and printed materials. The papers relate to numerous organizations--social, political, civic, and philanthropic--with which he was associated. Among these organizations are Legal Aid Society; Prison Association of New York; Outdoor Recreation League; Socialist Democratic League and National Party; American Alliance for Labor and Democracy; Constitutional Democracy Association; National Security League; YMCA, etc. Included among the papers are his journals and diaries, 1884-1950. An incomplete set of his letterbooks 1905-1960 and some family papers relating to real estate and financial matters

Correspondence, documents, financial records and memorabilia. The personal correspondence of Lawrence A. Wien, 1960-1983; including memoirs and notes on interests both personal and financial. The Lawrence A. Wien Foundation files include correspondence, 1958-1976, information on the Foundation's 10-year trust, and information on tax returns. Files for the Charles and Rosanna Batchelor Memorial fund consist of general correspondence, grant requests, and miscellaneous financial documents. The Committee to Increase Corporate Philanthropic Giving files comprise a large part of the collection. Among the numerous individual corporations represented are the American Broadcasting Company and the Zale Company. Wien's Foundation for the Improvement of Housing Arrangements for Official Foreign Personnel has personal files for each person receiving the Foundation's benefits, guarantees for those individuals, and letters ment to solicit funds from various corporations

Correspondence, documents and manuscripts from late seventeenth and eighteenth century France, especially from the French Revolution, collected by Sam Schaefler. Authors include J.B. Colbert Torcy and the Duchesse Du Lude. Many of the items from the French Revolution represent the work of the Committee of Public Safety and the Committee of General Security. French Revolutionary leaders represented in the collection include François-Antoine Boissy D'Anglas, Jean-Baptiste-Noel Bouchotte, Pierre Joseph Cambon, Lazare Carnot, Jean-Marie Collot D'Herbois, l'Abbʹe de Fauchet, Philippe-Antoine Merlin de Douai, Jean Victor Moreau. C.A. Prieur-Duvernois, and Antoine Joseph Santerre. In addition, the collection includes a letter from the Danish physicist Hans Christian Oersted to Sir John Herschel, a letter by the French poet Romain Rolland, a document of the Philadelphia Artists' Fund Society of 1846 with signatures of its officers, and an autograph letter and a photograph of Henry Wadsworth Longfellow.

Correspondence, account books, invoices, insurance policies, ledgers, payroll and wage records, receipts, and galley proofs. The records concern his cotton spinning mills in Stockport and Mellor. There are letters from merchants, tradesmen, manufacturers, and others relating to textile manufacturing and its mechanization in England during the last quarter of the eighteenth century. Included among the correspondents are: Sir Richard Arkwright, inventor of the spinning jenny; his son, Richard Arkwright; Henry Norris; Samuel Oldknow; Thomas Oldknow; Richard and Susannah Pennant (Baron and Baroness Penrhyn); Samuel Salte; and William Salte. Also included are the galley proofs for those letters published in George Unwin: SAMUEL OLDKNOW AND THE ARKWRIGHTS (London, 1924)

Letters written to Gay from political and literary contemporaries such as Horace Greeley, Charles Sumner, and William Bryant; reports in letter form from his reporters at the front during the Civil War; and personal correspondence including many letters from his wife, Elizabeth Neall Gay. Letters written to Mrs. Gay from family friends and business associates including many from her husband. Correspondence of other members of the Gay family including Walter Gay, Sarah Gay, and Allan Gay. Diaries, notebooks, and journals of Sydney Howard Gay.

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.

The records of W.R. Grace & Co. cover the rise of the Grace shipping business from 1864 until World War II. The early correspondence concerns all aspects of the shipping business in New York and South America, mining interests in Peru and Chile, the railroad in Costa Rica, the inter-ocean canal planned for Nicaragua, and political interests throughout Central and South America. There are letter books, correspondence, and scrapbooks of clippings for all aspects of W.R. Grace's career. There are minute books and other documents for more than 50 subsidiary companies owned by W.R. Grace & Co. or by family members. The papers of Joseph Peter Grace (1872-1950) continue the business, family, and philanthropic activities until 1942. There are also 20 reels of motion picture film about the Grace Co. South American interests in the 1950s.