File:Antiaircraft defence Sweden 1940.jpg

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Original file ‎(1,945 × 1,305 pixels, file size: 2.99 MB, MIME type: image/jpeg)

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Svenska: Lyssnarutrustning för luftvärnet. Beredskapsställning i Trelleborg, Sverige 1940.
English: Soldiers operating an acoustic airplane locator during World War 2, Trelleborg, Sweden, 1940. Before radar was invented, acoustic locator equipment was used to detect approaching enemy aircraft by listening for the sound of their engines. The detection horns were used in pairs; the side horns used for determining the bearing of the aircraft and the top and bottom horns the elevation. Each pair of horns was attached by rubber hoses to a stethoscope-type earphone worn by a technician. By rotating the horizontal and vertical axes of the horns until the aircraft sounded "centered" stereophonically in the earphones, the bearing and elevation of the aircraft could be determined.
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Source My father, I´m now the only owner.
Author Carl Gunnar Rosborn
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(Reusing this file)		 I´m the only owner to the original photo, taken by my father.

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© The copyright holder of this file allows anyone to use it for any purpose, provided that the copyright holder is properly attributed. Redistribution, derivative work, commercial use, and all other use is permitted.

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current15:26, 15 August 2009Thumbnail for version as of 15:26, 15 August 20091,945 × 1,305 (2.99 MB)Sven Rosborn (talk | contribs){{Information |Description={{sv|1=Lyssnarutrustning för luftvärnet. Beredskapsställning i Trelleborg, Sverige 1940.}} |Source=My father, I´m now the only owner. |Author=Carl Gunnar Rosborn |Date=1940 |Permission=I´m the only owner to the original pho

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