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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / NATIONAL PHYSICAL LABORATORY (c) CROWN COPYRIGHT |
Bildgröße: | 4819 px × 3640 px |
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