Bulletin, Utgave 347U.S. Government Printing Office, 1931 |
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Side 7
GASES IN TIMBERED MINES 7 tected only once and then by odor only . Tests of large samples of various rocks from the district sealed in glass carboys with atmos- pheric air and ordinary tap water or mine water showed that gases similar ...
GASES IN TIMBERED MINES 7 tected only once and then by odor only . Tests of large samples of various rocks from the district sealed in glass carboys with atmos- pheric air and ordinary tap water or mine water showed that gases similar ...
Side 8
... tests the air thoroughly or has adequate respiratory protection . High percentages of carbon dioxide and nitrogen and a low per- centage of oxygen are found almost invariably at some time or place in connection with fires in metal mines ...
... tests the air thoroughly or has adequate respiratory protection . High percentages of carbon dioxide and nitrogen and a low per- centage of oxygen are found almost invariably at some time or place in connection with fires in metal mines ...
Side 18
... tested is insufficient to support the flame and also indi- cates the presence of abnormally high percentages of nitrogen or carbon dioxide , or both . If the oxygen - deficient air hangs near the top of a raise or a high point it is ...
... tested is insufficient to support the flame and also indi- cates the presence of abnormally high percentages of nitrogen or carbon dioxide , or both . If the oxygen - deficient air hangs near the top of a raise or a high point it is ...
Side 19
... tested is aspirated through a metal barrel filled with activated charcoal to remove interfering gases and is then discharged through a small glass tube containing the activated iodine pentoxide . The aspirator bulb , when squeezed ...
... tested is aspirated through a metal barrel filled with activated charcoal to remove interfering gases and is then discharged through a small glass tube containing the activated iodine pentoxide . The aspirator bulb , when squeezed ...
Side 21
... tests and equip- ment ; safe means of respiratory protection are also available should emergency work in dangerous gases be necessary . These have been described and illustrated in various publications cited in the footnotes .
... tests and equip- ment ; safe means of respiratory protection are also available should emergency work in dangerous gases be necessary . These have been described and illustrated in various publications cited in the footnotes .
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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.