A Treatise on Practical and Theoretical Mine VentilationJ. Wiley & sons, 1900 - 141 sivua |
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Tulokset 1 - 5 kokonaismäärästä 7
Sivu 74
... districts , and to cause the excess to pass into other parts of the mine . They are simply sliding- doors , whose open area may be increased or diminished as required by circumstances , and which can be locked fast at any area , the key ...
... districts , and to cause the excess to pass into other parts of the mine . They are simply sliding- doors , whose open area may be increased or diminished as required by circumstances , and which can be locked fast at any area , the key ...
Sivu 76
... districts requiring the most air will receive only a small portion , while other districts requiring but little will receive large quantities . Common sense suggests , that , of two developed districts of a mine , the more developed ...
... districts requiring the most air will receive only a small portion , while other districts requiring but little will receive large quantities . Common sense suggests , that , of two developed districts of a mine , the more developed ...
Sivu 77
... districts need not necessarily be stopped , unless it is found necessary to pass the whole current through the dangerous district . If the gases be given off in such quantities that an explosion takes place before the miner perceives ...
... districts need not necessarily be stopped , unless it is found necessary to pass the whole current through the dangerous district . If the gases be given off in such quantities that an explosion takes place before the miner perceives ...
Sivu 78
... districts of the same area ; and also the same mine arranged so as to form one continuous airway , whose length will be four times greater than that of one of the districts . Let a area , p = perimeter , = length , and Q = quantity ...
... districts of the same area ; and also the same mine arranged so as to form one continuous airway , whose length will be four times greater than that of one of the districts . Let a area , p = perimeter , = length , and Q = quantity ...
Sivu 79
... district , or 4m Q2 , a value sixty - four times the first . 31. By splitting the air - current , or leading it off from the downcast into the different districts to be venti- lated , we have two decided advantages over the old method ...
... district , or 4m Q2 , a value sixty - four times the first . 31. By splitting the air - current , or leading it off from the downcast into the different districts to be venti- lated , we have two decided advantages over the old method ...
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air circulating air gave air in mines air passing air-column air-course air-current amount anemometer asphyxia atmosphere barometer brattice carbonic acid coal coal-dust Colliery column cubic feet cubic foot cubic inches Davy lamp diameter discharge districts double downcast drifts employed engine equal explosion fan-drift feet of air feet per minute feet square fire-damp flame formula furnace gallery gases gauze height hence horse-power inches of mercurial inches water-gauge increased ksv2 lamp length marsh-gas measured mechanical ventilators mercury method miners morocco motive-column Mueseler lamp multiplied number of revolutions oxygen perimeter piston pounds per square pressure per square pressure required Problem proportional quan quantity of air regulators required to overcome resistance revolutions per minute rubbing-surface safety-lamp sectional area shaft shutter smaller airway splitting square feet square foot Suppose temperature tion tity total pressure tube upcast velocity ventilating pressure volume of air