Student officers at the anti-aircraft gun school at Fortress Monroe, Va. are seen using the Tachyscope, an instrument that registers the speed and direction of a target. This photograph, numbered "9733 A," was taken by Lt. William Fox of the Signal Corps in April 1918.

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Size: 9177px × 6297px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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