NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY
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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