1918 Navy Mark II Gas Mask
Of all the U.S. developments in 1918 and 1919, the Navy Mark II head canister gas mask was certainly the most peculiar. The filter canister was worn on top of the head as part of an integrated, helmet-like metal support system. Air was inhaled through an opening in the back of the filter canister, drawn through to the front of the canister and down into the mask via two short rubber hoses that connected just above the eyepieces. The mask had a rubber, flapper-type exhale valve that pointed up from between the glass eyepieces. It was designed to protect the wearer from chemical warfare agents.