Bulletin, Utgave 347U.S. Government Printing Office, 1931 |
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Resultat 1-5 av 9
Side 3
... means confined to the United States . From time to time the foreign technical press has described methane occurrences , explosions , or ignitions in European , African , and other metal mines , the most recent being in the gold mines of ...
... means confined to the United States . From time to time the foreign technical press has described methane occurrences , explosions , or ignitions in European , African , and other metal mines , the most recent being in the gold mines of ...
Side 4
... means of detecting explosive gas or preventing its ignition if it should be encountered . HIGH - NITROGEN OR CARBON DIOXIDE AND LOW - OXYGEN GASES Gases high in carbon dioxide or nitrogen , or both , and low in oxygen are likely to be ...
... means of detecting explosive gas or preventing its ignition if it should be encountered . HIGH - NITROGEN OR CARBON DIOXIDE AND LOW - OXYGEN GASES Gases high in carbon dioxide or nitrogen , or both , and low in oxygen are likely to be ...
Side 5
... means absent from the latter . RICO DISTRICT , COLORADO Recently an occurrence of irrespirable gases in a metal mine in the Rico district , southwestern Colorado , was investigated by the United States Bureau of Mines . Irrespirable ...
... means absent from the latter . RICO DISTRICT , COLORADO Recently an occurrence of irrespirable gases in a metal mine in the Rico district , southwestern Colorado , was investigated by the United States Bureau of Mines . Irrespirable ...
Side 6
... means of a vacuum bottle in the shaft showed less than 0.3 per cent of oxygen , per cent of carbon dioxide , and 81 per cent of nitrogen , although the air in this same shaft had been entirely free of gas a few hours before . One idle ...
... means of a vacuum bottle in the shaft showed less than 0.3 per cent of oxygen , per cent of carbon dioxide , and 81 per cent of nitrogen , although the air in this same shaft had been entirely free of gas a few hours before . One idle ...
Side 7
... means of ventilation were introduced . Rock and air temperatures in these mines were abnormally high . Some of the gases contained more than 60 per cent of carbon dioxide , whereas other gases were almost pure nitrogen and consequently ...
... means of ventilation were introduced . Rock and air temperatures in these mines were abnormally high . Some of the gases contained more than 60 per cent of carbon dioxide , whereas other gases were almost pure nitrogen and consequently ...
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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.