使用的气体Masks in Germany
Gas masks are used widely in Germany by fire departments and the industries, but not yet in mines, according to S. H. Katz, who made a study of the use of gas masks abroad for the United States Bureau of Mines, Department of Commerce. Fire departments especially are well equipped, and nearly every fireman in Germany has a mask. The most popular mask is based on the German army mask used during the World War. It has a leather facepiece and a drum-shaped canister attached so as to allow changing the canisters. The headbands are of fabric with small spiral metal springs inclosed for elastics. Facepieces are also made of rubber and of rubberized fabric.
The mask forms a pocket over the wearer’s face, and he breathes through his nose. There are no valves; both the inspired and expired air pass through the canister and filtering materials. Disks of gelatin to absorb moisture and prevent fogging are placed inside the eyepieces; these are changeable.
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