A group of military personnel from the School of Radio and Multiplex Telegraphy at the College of the City of New York conducting field work. They are seen using the heliograph, wig-wag, and semaphore methods of communication. This photo was taken in December 1918.

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Size: 8495px × 5774px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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