American soldiers learning different methods of signaling, including wig-wag, semaphore, and heliograph, at the Signal Corps School of Radio and Multiplex Telegraphy in New York. The photo was taken on April 27, 1919, and is marked for official use only.

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Size: 8596px × 5874px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ...., 58916, activities, american, corps, description, heliograph, issued, military, multiplex, ny, official, photographer, photographs, radio, school, semaphore, signal, subiect, sunser, telegraphy, war, wig-wag, world