World War II Arthur Bondar Collection
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Acoustic guidance system for anti-aircraft artillery. An acoustic locator consisting of four acoustic horns, a horizontal pair and a vertical pair, connected by rubber tubes to stethoscope headphones worn by two technicians on the left and right. The stereo headphones allowed one technician to determine the direction and the other to determine the height of the aircraft. The acoustic locator could detect targets from 5 to 12 kilometres away, depending on weather conditions, operator skill and the size of the target formation. It gave a directional accuracy of about 2 degrees. West Germany. 1940-41

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Photos from collection The Western Wall and the air defense of the Third Reich