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| Keywords: Acousticlocatorusarmy1935.jpg US Army Signal Corps aircraft sound locator equipment 1935 Before radar was developed in World War 2 acoustic horns like this were used in air defence to detect incoming enemy aircraft at a distance by the sound of their engines Stereo horns one attached to each ear allowed the observer to judge the direction of the aircraft First Army Maneuvers Pine Camp New York August 1935 Signal Corps Photo 103030 en wikipedia Evers URL http //www infoage org/Dav-1-fig15 html 1935-08 author PD-USGov original upload log page en wikipedia Acousticlocatorusarmy1935 jpg 2006-04-11 17 37 Nagle 320×264×8 23644 bytes <nowiki>1935-MODEL SOUND LOCATOR First Army Maneuvers Pine Camp New York August 1935 Signal Corps Photo 103030 URL http //www infoage org/Dav-1-fig15 html</nowiki> Military equipment of the United States Sound locators | ||||
