On the inside of the mask, a mouthpiece - similar to that of a common snorkel - and a gauze-padded nose clamp can be found. The peripheral seal is made of a massive amount of rubber cement. The straps lack a method of adjustment besides a safety pin that is meant to be used to shorten the length of the top strap. The head harness' straps are made of an elastic material, save for the one that crosses the top of the head which is made of cotton. The lens frames are, oddly enough, secured to the mask using string. The mask has a build that is typical for the time as the faceblank is made of rubberized fabric and the hardware is lacquered metal. Its filter was capable of filtering out every German chemical agent used in the war, however, it had shortcomings, including the fact how one could not inhale through the nose due to a noseclamp being present. The mask was used by many members of the Entente, notably Britain and her empire, Italy, Portugal, and the United States. Lesser known is that Porton Down's Major John Ambrose Sadd was also involved in the production of these respirators. He later died as a result of testing the gases on himself to ensure the protective efficiency of his designs. Harrison, who was celebrated as the man who saved the British Army. The design of the Small Box Respirator is primarily credited to Lieutenant-Colonel E. It was a vast improvement from the PH Hood, as it used a hose and external filter design as opposed to simply treated cloth. The Small Box Respirator was a British manufactured mask, designed and entering service in 1916.
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