The photograph shows signal corps apparatus used during World War I. Specifically, it features the Syndol X Kolster Decremeter, type D, with the case removed. The apparatus is labeled as K NOTE B 312 28 on its front. It was one of the tools used by the American military during that time.

---

Size: 8412px × 5734px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 37, 228, activities, american, appar, apparatus, archive, army, black, case, communication, corps, decremeter, device, documentation, effort, equipment, government, historical, innovation, instrument, kolster, machinery, military, number, official, operation, photograph, photographer, reco, removed, retro, science, signal, soldier, soldiers, strategy, syndol, technology, type, uniform, vintage, war, wartime, white, world