Bulletin, Utgave 347U.S. Government Printing Office, 1931 |
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Resultat 1-5 av 6
Side 12
... harmful when inhaled , unless , because of its presence , the oxygen content of the air is lowered beyond the safe amount . In normal air mixtures of 5 to 14 per cent of methane and air are ex- plosive if brought in contact with an ...
... harmful when inhaled , unless , because of its presence , the oxygen content of the air is lowered beyond the safe amount . In normal air mixtures of 5 to 14 per cent of methane and air are ex- plosive if brought in contact with an ...
Side 16
... harmful gases , and lack of air movement , all of which are readily remedied by ventilation . With dry - bulb temperatures below 75 ° F. mine working places may be comparatively comfort- able , irrespective of air movement or relative ...
... harmful gases , and lack of air movement , all of which are readily remedied by ventilation . With dry - bulb temperatures below 75 ° F. mine working places may be comparatively comfort- able , irrespective of air movement or relative ...
Side 17
... harmful ( at least until the temperature is well above 90 ° F. ) and that air movement has a vital influence on the productive capacity of workers . Although ventilation has generally been deemed an integral part of coal mining , metal ...
... harmful ( at least until the temperature is well above 90 ° F. ) and that air movement has a vital influence on the productive capacity of workers . Although ventilation has generally been deemed an integral part of coal mining , metal ...
Side 18
... harmful to man much quicker than will 22 Yant , W. P. , and Berger , L. B .. Instructions in Methods of Sampling and in the Use of the Bureau of Mines Portable Orsat Apparatus for Analyzing Mine Gases : Miners ' Circ . 34 , Bureau of ...
... harmful to man much quicker than will 22 Yant , W. P. , and Berger , L. B .. Instructions in Methods of Sampling and in the Use of the Bureau of Mines Portable Orsat Apparatus for Analyzing Mine Gases : Miners ' Circ . 34 , Bureau of ...
Side 20
... harmful gases discussed in this paper means of respiratory protec- tion 29 must be used . The self - contained oxygen breathing apparatus of types approved by the United States Bureau of Mines furnishes such protection . The bureau has ...
... harmful gases discussed in this paper means of respiratory protec- tion 29 must be used . The self - contained oxygen breathing apparatus of types approved by the United States Bureau of Mines furnishes such protection . The bureau has ...
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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.