In this photograph from Nov. 8, 1918, a wave meter, manufactured by the General Radio Co., Cambridge, Mass., is shown. This mechanism was used by the Signal Corps during World War One. It was used for official purposes only and not meant for publication. Photograph by Sgt. McGarrigle.

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Size: 8370px × 5643px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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