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During a depth charge test in 1957, the resulting 300-foot-high water plume was struck by lightning. [U.S. Naval Institute]

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A four-horn acoustic locator, in England, 1930s. There are three operators, two with stethoscopes linked to pairs of horns for stereo listening.

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Paul Regnard CATALEPSIE Provoquée par le bruit du diapason Planche XX Iconographie photographique de la Salpêtrière vol. 3 (Paris, Progrès médical, 1880)

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Workmen fit a set of paraboloids in a sound detector for use by anti-aircraft batteries guarding the skies England, in a factory somewhere in England, on July 30, 1940.

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The Voder as demonstrated by Mrs Harper at The Franklin Institute, c. 1939. The Voder (Voice Operation DEmonstratoR) was Bell Telephone Laboratory's first attempt to electronically synthesize human speech.

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Antiaircraft sound locator apparatus with searchlight and transport, 1932 [Coast Artillery Corps, USA]

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Soldiers operating an acoustic airplane locator during World War II, Trelleborg, Sweden, 1940. (Photo Carl Gunnar Rosborn]

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Ethnomusicologist Frances Densmore at the Smithsonian Institution during a recording session with Blackfoot leader Mountain Chief for the Bureau of American Ethnology, 1916.

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Half of the heavy listening device Goertz (Czechoslovakia) developed between WWI and WWII.

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Acoustic Mirrors at Denge, a site of the British Royal Air Force near the Channel, where some experimental models were built in the 1920s and 1930s. One is…

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