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Letters, photographs, clippings, and printed materials relating to Morse, collected by his granddaughter, Leila Livingston Morse. Much of the material, including the two hundred letters in the collection, relate to the Morse Centennial in 1944.

Correspondence, manuscripts, notes, memoranda, notebooks, notecards, proofs, photographs, microfilms, and printed materials. The Papers include the manuscript research materials and correspondence for each of his books except his biography of Theodore Dreiser. Among the correspondents are William Benton, Bruce Catton, Carey McWilliams, Mrs. Fremont Older (Cora Miranda Baggerly Older), and Thornton Wilder.

Correspondence of Nikola Tesla and Robert Underwood Johnson include letters of Tesla to Johnson's wife and daughter, clippings, photographs, and miscellaneous materials. Letters to George Scherff, 1902-1930, and others, manuscripts, printed articles, patents, and brochures. The material is of a technical nature and the letters deal primarily with Tesla's work on transformers, turbines, steam and gas oscillators, compressors, pumps, induction motors, and wireless transmitters. Also, printed materials by and about Tesla, including DR. NIKOLA TESLA BIBLIOGRAPHY (1979) by John T. Ratzlaff and Leland I. Anderson; and published selections from diary entries, correspondence, patents, and patent wrappers by Tesla published by the Tesla Book Company. There is also a videotape cassette "Nikola Tesla the Genius Who Lit the World".

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.

A collection of twenty-nine letters written by and relating to Ericsson. Twenty-three of the letters were written by John Bourne from London. The material all relates to Ericsson's designs for naval engines, their patenting, and execution.

This collection of contracts, patent assignments, other legal documents, and correspondence of Edison and others, deals with the development of the telegraph and the expansion of the telegraph network. There are 31 cataloged legal documents concerning his telegraphic patents, his company (Pope, Edison & Company), and its purchase by The Gold and Stock Telegraph Company in 1870. Other contracts concern the early work of Samuel F.B. Morse and other inventors, and later telegraph companies.

Photostats of letters from Joseph-Nicéphore Niépce to Claude Niépce, written from St. Loup and Chalon sur Saône, all but two in the years 1816-1817. Much of the material in the letters relates to photography and these have been published in part in Foque's LA VÉRITÉ SUR L'INVENTION DE LA PHOTOGRAPHIE; NICÉPHORE NIÉPCE, SA VIE, SES ESSAIS, SES TRAVAUX (Paris, 1867).

Material relating to Fulton, including two letters, three deeds, and eight other items dealing chiefly with lands and matters concerning Fulton's steamboats. Also, an unidentified photograph and three letters, 1828-1830, to Walter Edwards, a lawyer living in New York, from his father and two brothers, but having no clear reference to or connection with Fulton. Typescript calendar at the front of the volume.

Personal and professional correspondence, including 25 long letters from Professor Henry F. Herbig; manuscripts (mainly speeches); specifications for patents in electrical fields; technical and personal photographs; and memorabilia. Included is a copy of the famous "shot in hand" x-ray photograph, ca. 1896, one of the first ever to be taken. This collection also contains the correspondence, manuscripts, documents, and memorabilia of Professor Pupin's daughter, Varvara Smith, and his son-in-law, Louis Graham Smith. His daughter's letters and documents deal with her financial difficulties, her administration of Pupin's estate and her claims against Columbia University. Louis G. Smith's letters deal with his anti-Communist sentiments and his manuscripts are mainly ideas for popular songs and plays. There are three letters (photostatic copies) to Smith from Dwight D. Eisenhower.