Horchgerät der Flak bei Berlin

Zf612. Sound location equipment in Germany, 1939. It consists of four acoustic horns, a horizontal pair and a vertical pair, connected by rubber tubes to stethoscope type earphones worn by the two technicians left and right. The stereo earphones enabled one technician to determine the direction and the other the elevation of the aircraft. This picture is from Wikipedia, look for the URL below.

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