Acoustics test, 1954

Acoustics test, 1954

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Credit: NATIONAL PHYSICAL LABORATORY (c) CROWN COPYRIGHT/ SCIENCE PHOTO LIBRARY

Caption: Acoustics test. Researcher sitting in front of a speaker during an acoustics test. The test involves studying the loudness and threshold of high-frequency tones using plane progressive sound waves. Photographed in 1954, in the Physics Division of the National Physical Laboratory, Teddington, UK.

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