Folder: Tongue and ear

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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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The heavy listening device Goertz (Czechoslovakia) developed between WWI and WWII.

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Dutch personal horns. Rotating acoustic listening device developed for the Dutch army as part of air defense systems research between World Wars I and II, 1930s.

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German acoustic/optical locator, 1917. A junior officer and an NCO from an unidentified Feldartillerie regiment wearing combined acoustic/optical locating apparatus.

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Japanese ‘War Tuba’ in an air field, 1921. After WWI aircraft detection became increasingly important to warfare. Before radars acoustic amplifiers and mirrors with different designs were used…

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Acoustic listening device developed for the Dutch army as part of air defense systems research between World Wars I and II.

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Athanasius Kircher, Musurgia Universalis (1650) An early example of a plan to build a pansonic device, capable of bringing the sounds from the public space up to the…

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Writing with your voice, Popular Science (Mar. 1947)

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Wire Recorder Saves Time by Handling Data on Photographs, Popular Mechanics, Dec, 1950 Photographers who do considerable work in the field can save time by using a wire…