Bulletin, Utgave 347U.S. Government Printing Office, 1931 |
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Side 4
... amounts of methane , which was seeping into it from the surrounding sedimentary strata . During the remainder of the work on the project strict precautions were taken against gas accumulations as well as against sources of gas ignition ...
... amounts of methane , which was seeping into it from the surrounding sedimentary strata . During the remainder of the work on the project strict precautions were taken against gas accumulations as well as against sources of gas ignition ...
Side 5
... amounts probably has affected efficiency as well as the general health of the miners . The ore is valuable chiefly ... amounts of gases , but gases were present in considerable amounts in parts of the mine at all times . As in other ...
... amounts probably has affected efficiency as well as the general health of the miners . The ore is valuable chiefly ... amounts of gases , but gases were present in considerable amounts in parts of the mine at all times . As in other ...
Side 6
... amounts . rule the mixture of gases is much heavier than air , but occasionally gases high in nitrogen and consequently lighter than air are found at the top of raises rather than near the floors of drifts , levels , and winzes . Much ...
... amounts . rule the mixture of gases is much heavier than air , but occasionally gases high in nitrogen and consequently lighter than air are found at the top of raises rather than near the floors of drifts , levels , and winzes . Much ...
Side 7
... amount of pyrite and other sulphides found in other metal - mining districts , but the fissured and porous nature of the rock affords an opportunity for rapid chemical action when moist air comes in contact with such sulphides . ROCK ...
... amount of pyrite and other sulphides found in other metal - mining districts , but the fissured and porous nature of the rock affords an opportunity for rapid chemical action when moist air comes in contact with such sulphides . ROCK ...
Side 9
... amounts of hydrogen sulphide and possibly , under certain conditions , sulphur trioxide . In some iron ore mines with adjacent black - shale strata spontaneous fires give off fumes containing hydrogen sulphide and sulphur dioxide as ...
... amounts of hydrogen sulphide and possibly , under certain conditions , sulphur trioxide . In some iron ore mines with adjacent black - shale strata spontaneous fires give off fumes containing hydrogen sulphide and sulphur dioxide as ...
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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.