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action adequate amounts apparatus atmosphere blasting blood breathing Bull Bureau of Mines candle carbide carbon dioxide carbon monoxide caused cent cent of carbon coal mines color concentrations connection contain continuous dangerous deficient detected determined district driven dust effect efficiency electric especially explosives extinguished fatal feet fire flame safety lamp formed frequently fumes gas mask gases give harmful Harrington hazard heat humidity hydrogen sulphide ignitions instances killed less material means metal mines metal-mine metal-mine fires methane method Michigan miners natural nitrogen numerous occurred odor open light operations oxides of nitrogen oxygen oxygen content percentages places poisonous precautions present pressure probably produced quantities readily Recently record region relatively Report Rept result rock Rock-Strata Gases samples sealed shafts showed similar smoke strata sulphur dioxide taken Tech temperature tested timber tion tunnel underground usually various ventilation winze workers
Side 5 - ... are a result of the action of atmospheric air and mine water upon the sulphides and carbonates in the fissured rock.