Chemical Warfare Service research division conducting physiological research using the G-52 intermittent canister testing machine. This machine was used to test the effectiveness of chemical warfare agents. Date: July 12, 1918. Photo received from Chemical Warfare Service; Research Division. Photo number: 54779. Photo description: Chemical Warfare Service; Research Division; Physiological Research by Marshall. Machine notes: G-52 intermittent canister testing machine.

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