Chemical Warfare Service Research Division developed a machine for testing canister springs during World War I. The machine, designed by Walthers, uses a torsion type mechanism. This photograph, taken on July 12, 1918, shows the machine in action.

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Size: 8486px × 5794px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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