Acoustics test. Researcher sitting inside an acoustics duct being used for subjective loudness tests at low frequencies. Photographed in 1953, in the
Acoustics test. Researcher sitting inside an acoustics duct being used for subjective loudness tests at low frequencies. Photographed in 1953, in the Physics Division of the National Physical Laboratory, Teddington, UK.
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Photo credit: © NATIONAL PHYSICAL LABORATORY © CROWN COPYRIGHT/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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