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32 liters acid was added Adsorption of Mercury air breathed air saturated apparatus breathing tube Bureau of Mines calcium chloride canister tests canisters and respirator cartridge tests charcoal for mercury charcoal-filled canister charcoal-filled respirator cartridges Chem concen concentration of 2.4 concentration of mercury condensing coil contaminate the air face piece flow of 32 footnote 12 gas masks gram of charcoal Hopcalite liquid air liters a minute liters per minute long life period mercury saturated mercury-saturated air milligrams of mercury minimum detectable nitric acid Nordlander organic vapors p.p.m. by volume p.p.m. mercury vapor perature pressure of mercury protection against mercury rate of 32 Respiratory Protective Devices Rest 17.5 Test rest periods saturated air saturated at 63 saturated with mercury selenious acid selenium dioxide selenium sulphide test Sensitivity of Selenium sulphide test papers TEST CONDITIONS test temperature thermostat tridge type-N canisters U. S. Bureau vapor at 63 vapor pressure Yellow selenium sulphide