Revision history of "File:ListeningEarAmplifiers.JPG"

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  • curprev 19:23, 11 December 2021‎ Leeann talk contribs‎ 337 bytes +337‎ Attribution: https://www.thesitemagazine.com/read/perceive-editorial A scaled-down version of parabolic reflectors developed as a personal listening device by the Luchtwachtdienst (Dutch Air Watch Service) for military use in tracking and locating incoming aircraft, 1930–35. Photograph courtesy of Museum Waalsdorp, TNO
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