A photograph from January 23, 1918, showing a radio-goniometer used for military activities during World War One. The radio-goniometer was a device used to detect and locate radio signals. This image was released by to the Photo Division of the Signal Corps, subject to approval.

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Size: 7982px × 6302px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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