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Sound -- Equipment and supplies

 Subject
Subject Source: Library of Congress Subject Headings

Found in 4 Collections and/or Records:

Adolph R. Morgan papers, 1951-1971

 Series
Identifier: 2464-09-2.-V.
Scope and Content: The papers of Adolph R. Morgan include evidence of his work with underwater communications, microphones, and noise cancellation of underwater sounds.

One of Morgan's lab notebooks (1954-1960) can be found in Record group 26.
Dates: 1951-1971

Audio, circa 1930-1977

 Series
Identifier: 1995-220-I.
Scope and Contents: The Audio series contains images related to non-broadcast sound equipment. The series is organized into eleven subseries: Commercial sound equipment, Equipment, Intercom, Loud speakers, Manufacturing sets & records, Meters, Microphones, Phonographs & transcriptions, Record changers, Sound trucks, and Speakers. The series materials date from 1930 to 1977. The Meters subseries are primarily images of audio meters like decibel and acoustic gauges measurements, but it’s possible other types of meters are in this subseries related to broadcasting. Additionally meters appear in other series such as the Radio/TV broadcasting series.
Dates: circa 1930-1977

Harry F. Olson papers, 1918-1976

 Series
Identifier: 2464-09-2.-I.
Scope and Content: The Harry F. Olson papers include schematics and drawings, a body of articles and patents, and correspondence from Olson’s work in acoustics at various RCA research divisions.

Photographs include, predominantly black and white with a few color, images of loudspeakers, microphones, and the magnetic video tape recording system.

Sound tape reels contain over 40 recordings of 'word lists' presumably used by Olson in his work with the phonetic typewriter.
Dates: 1918-1976

Herbert Belar papers

 Collection
Identifier: 2767
Abstract: Herbert Belar (1901-1997) was an inventor and research scientist in the field of acoustical engineering at the RCA David Sarnoff Research Center in Princeton, New Jersey for thirty-eight years. He developed "hi-fi" recording, the phonetic typewriter, and the electronic music synthesizer. This small collection of Herbert Belar papers reflects the professional daily work of an acoustical engineer from the 1930s through the 1960s. There is significant documentation on the phonetic typewriter, the 200 speech communication system, the music composing machine, and the electronic music synthesizer. Notable inclusions are information related to the development of "hi-fi," film motion pictures sound recording, and phonographic records recording. There is only one file that discusses Belar's work at the MAD Laboratory.
Dates: 1928-2020; Majority of material found within 1938-1966