Bulletin, Utgave 347U.S. Government Printing Office, 1931 |
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Side 16
... Continuous operation of the surface fan while men are in the mine . 5. Maintenance of all airways so that they allow ready unob- structed passage of air . 6. Splitting of air currents systematically so that fire in one sec- tion of a ...
... Continuous operation of the surface fan while men are in the mine . 5. Maintenance of all airways so that they allow ready unob- structed passage of air . 6. Splitting of air currents systematically so that fire in one sec- tion of a ...
Side 18
... continuous methane recorder has also been devised for automatically determining and continuously record- ing the amount of methane ; for example , in a return - air current . Hydrogen sulphide gas may be detected by its characteristic ...
... continuous methane recorder has also been devised for automatically determining and continuously record- ing the amount of methane ; for example , in a return - air current . Hydrogen sulphide gas may be detected by its characteristic ...
Side 19
... continuous carbon monoxide recorder for accurately and continuously recording on a chart the amount of carbon monoxide in the air tested.28 This device is accurate for very low percentages of carbon monoxide ( less than 1 part in 10,000 ) ...
... continuous carbon monoxide recorder for accurately and continuously recording on a chart the amount of carbon monoxide in the air tested.28 This device is accurate for very low percentages of carbon monoxide ( less than 1 part in 10,000 ) ...
Side 20
reliable for continuous sampling and analysis of air in motor vehic- ular tunnels . Oxides of nitrogen may be present if brownish yellow fumes or a strong " burned - powder " odor are detected after blasting . These oxides are so ...
reliable for continuous sampling and analysis of air in motor vehic- ular tunnels . Oxides of nitrogen may be present if brownish yellow fumes or a strong " burned - powder " odor are detected after blasting . These oxides are so ...
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Vanlige uttrykk og setninger
activated iodine pentoxide adequate amounts asphyxial asphyxial gases atmosphere Bull Bureau of Mines burning candle carbide lamp carbon dioxide carbon monoxide cent of carbon cent of oxygen Circ circulation of air coal mines combustible material decidedly dangerous deficient in oxygen dioxide and nitrogen dry-bulb temperatures efficiency electric arc explosive gas extinguished fire hazards flame safety lamp found in metal gas mask GASES FOUND gases high GASES IN METAL Gilpin County Harrington high in carbon hydrogen sulphide ignitions of methane inflammable inhaled Investigations killed metal mines metal-mine blasting metal-mine fires miners numerous open light oxides of nitrogen oxygen breathing apparatus oxygen content palladium chloride percentage of carbon poisonous gases PRECAUTIONS AGAINST GASES Pyrotannic Acid Method quantities relative humidity Rept respiratory protection result rock Rock-Strata Gases Sayers SCOTT TURNER shallow shafts strata sulphur dioxide sulphur gases Tech tested tion tunnel type N gas underground United States Bureau unventilated winze workers Yant
Populære avsnitt
Side 5 - ... are a result of the action of atmospheric air and mine water upon the sulphides and carbonates in the fissured rock.
Side 9 - Some of the heaviest losses of life in metal-mine fires have resulted from the burning of less than a railroad freight car or only a few cords of timber.