Miners' Circular, Volum 57

Accident Prevention accident-prevention aluminum athlete's foot atmosphere Bituminous-Coal Mines blasting breathing bulkhead Bureau of Mines carbide lamps causes caved change house Circ Circular cited in footnote clay seam clothes Crystal Falls cubic foot Drift face dust concentrations dust control dust particles dusty effect efficiency electric cap lamps employees equipment explosion fan exhausting figs flooding footcandles goggles handling materials harmful Harrington Haulage haulageway hazards humidity illumination industrial inhalation injuries Inrush of water installed investigation konimeter Lake Superior lead poisoning lifting light lowered lungs Metal Mines Metal-Mine Accident methods miners Mines Inf mining operations Mount Weather National Safety Council nonmetal organization percent persons pilot holes protection pumps removed respirators respiratory Respiratory Protective Devices rock Safety Committee safety engineer safety program safety rules sampling Sayers shaft shift boss shown in figure silica silicosis smelter stope surface tank temperature timber tion tunnel underground ventilation workers