Soldiers using Tachometer type C by Van Sickler on May 22, 1918. Lt. deBerri from the Signal Corps took this photo on June 3, 1918. The photo has a number of 11152 and is marked "Not for publication." The tachometer's RPM ranges from 20 to 60.

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Size: 9178px × 6297px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: .., ..., 3, 22, 1918, activities, american, deberri, hundreds, issue, june, lt., military, notes, photograph, publication, sickler, sig., tachometer, type, van, war, world