The photograph depicts a long wave receiving set in the interior of the Signal Corps field laboratory in Washington The set has a range of 6000 to 1800 meters and was taken on March 3, 1919. The photograph was captured by Sergeant Gray and is marked as not for publication.

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Size: 8525px × 5681px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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