Charles A. Rosencrans (1908-1991) was an RCA engineer who specialized in radio transmission. His notebooks largely consist of fragmentary handwritten notes from both his career at RCA and from his studies in electrical and mechanical engineering at Lehigh University.

The Circuits series contains images related to electrical currents and is organized into eleven series by type: Breadboards, Circuit boards, Circuitry, Head wheel, Heat pipe, Hybrid, Integrated circuit, Keyer, Micro-circuit, Modules, and Oscillators. Materials date from 1930s to 1976. There are some related materials in Computers, Government projects, and Tests/experiments series.

The Marconi Wireless Telegraph Corporation of America was founded in 1899 as the American branch of Guglielmo Marconi’s (1874-1937) Wireless Telegraph & Signal Company of London. Because of its emphasis on providing radio transmitter receivers for ships and fostering oceanic communications, the U.S. Navy commandeered the company during World War I. After the war, both government and industry colluded to buy out the British company; they created the Radio Corporation of America in its stead in 1919. This collection includes around 1,300 engineering and technical drawings from the Marconi Wireless Telegraph Company of America . Subjects depicted range from circuit diagrams, wiring layouts, and switchboard schematics to architectural plans for aerial towers and carrying case designs.

The Sperry Corporation's Aerospace Division traces its origins to Engineering Research Associates (ERA), a St. Paul, Minnesota firm founded by William Norris (1911-2006) and Howard Engstrom (1902-1962). In 1952 ERA merged with Remington Rand, Inc., where it became part of its Eckert-Mauchly Division. In 1960, five years after the Sperry-Remington Rand merger, it was renamed the Military Division, and in 1975 it became Sperry Rand's Aerospace Division. These photographs show details of identified laboratory testing of computer components.

The Sperry Corporation was an electronics company and the UNIVAC Division manufactured the first commercial digital computer. The Sperry UNIVAC division has its origins in the Eckert-Mauchly Computer Corporation (EMCC), founded in 1946 by J. Presper Eckert (1919-1995) and John W. Mauchly (1907-1980). In 1950, Eckert and Mauchly sold their firm to Remington Rand, Inc, a major manufacturer of business machines, who continued development of the UNIVAC system. The collection documents predecessor organizations to the Sperry Corporation, including the Remington Typewriter Company, the Rand Kardex Company, and the Sperry Gyroscope Company; the formation of the Eckert-Mauchly Computer Corporation; the development of the UNIVAC brand under Remington Rand, Inc.; Philadelphia and St. Paul branches of the UNIVAC division; the UNIVAC manufacturing plant in Bristol, Tennessee; and Sperry divisions outside of UNIVAC, including Sperry Gyroscope Flight and Defense Systems, and Remington Rand office equipment.

Thomas Peter Brody (1920-2011) was a theoretical physicist whose work in tunnel diodes and semiconductor device theory resulted in numerous electronic uses for thin film technology, eventually leading to his invention of active matrix flat panel display technology, or liquid crystal display (LCD) technology. The collection describes Dr. Brody's education, personal and professional character, scientific achievements, business successes and disappointments, as well as personal praise. Included are lecture notes, private and professional correspondence, research studies, patents, contracts, business records, and other documents related to Dr. Brody's career and the development of LCD technology.

The Thomas Chesek papers include promotional material for electronic components including linear integrated circuits, transistors, and analog-to-digital converters. Also included are publications from RCA, GE, and Harris Semiconductor including company newsletters and product guides. The papers also include internal correspondence from the RCA Solid State Division in Somerville, New Jersey along with handbooks, manuals, and directories for RCA employees from 1967 to 1981.

These photographs document the design and production activities at the Univac Engineering Center (UEC) of the Sperry Rand Univac Division between 1957 and 1961, particularly the LARC (I and II) and UNIVAC III projects. This subseries also includes various card punching and reading equipment designed during this period.