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forerunner invention mirror mirrors parabolic passive radar reflect reflectors sound three used wars waves worldSound Mirrors Forerunner Of Radar. Dungeness, England Editorial Photo
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Sound mirrors forerunner of Radar. Dungeness, England #169272915
Description
An acoustic mirror in three designs. A passive device used used to reflect and focus or concentrate, sound waves in parabolic reflectors. Used between world wars before the invention of Radar.
This image is editorial
