Bulletin, Utgave 347U.S. Government Printing Office, 1931 |
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Side 3
... pressure was high enough to prevent drilling , and it had to be blown off from the drill holes for many hours before work could be resumed . Methane occurrence in metal mines is by no means confined to the United States . From time to ...
... pressure was high enough to prevent drilling , and it had to be blown off from the drill holes for many hours before work could be resumed . Methane occurrence in metal mines is by no means confined to the United States . From time to ...
Side 6
... pressure system of holding the gases back in the strata ; a slight pressure induced by a blower fan or an injector is usually sufficient . To maintain such pressure the tops of shafts are bulkheaded and fitted with doors which may be ...
... pressure system of holding the gases back in the strata ; a slight pressure induced by a blower fan or an injector is usually sufficient . To maintain such pressure the tops of shafts are bulkheaded and fitted with doors which may be ...
Side 7
... pressure , few timbered metal mines are free from gases high in carbon dioxide and nitrogen and low in oxygen in long blind ends or winzes . In sections of metal mines in which there is little or no circulation of air , a condition fre ...
... pressure , few timbered metal mines are free from gases high in carbon dioxide and nitrogen and low in oxygen in long blind ends or winzes . In sections of metal mines in which there is little or no circulation of air , a condition fre ...
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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.