Engelbert Friebl and his crew on sound location equipment in Germany. 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.The acoustic locator could detect targets at distances from 5 to 12 km, depending on weather conditions, operator skill, and the size of the target formation. It gave a directional accuracy of about 2 degrees. The back reads Engelbert Friebl and comrades. This type of equipment was phased out by 1940 so the image is most 1936-1940.
germany
luftwaffe
between the 1850-01-01 and the 1990-12-31,world war two
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