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The Smoke Helmet was an early model respirator issued to soldiers during World War One.
The Smoke Helmet is a primitive respirator made almost entirely of fabric and cotton. The eye piece is a single rectangular sheet of mica sewn directly onto the fabric material to protect the user's eyes from chlorine gas.
The mask would function by soaking the fabric in glycerin and sodium thiosulphate and would be put over the user's head and tucked into their uniform collar. The chemicals on the helmet would terminate the chlorine gas they inhaled through the fabric.
The British Smoke Helmet was invented by Dr. Cluny Macpherson in 1915 to better protect soldiers from Chlorine gas.