A Treatise on Practical and Theoretical Mine VentilationJ. Wiley & Sons, 1904 - 141 sivua |
Kirjan sisältä
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 quantity of air ...
... 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 quantity of air ...
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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Yleiset termit ja lausekkeet
100 cubic feet air circulating air gave air in mines air passing air-column air-course air-current airway amount anemometer asphyxia atmosphere barometer brattice carbonic acid Clanny coal coal-dust Colliery column cubic foot cubic inches Davy Davy lamp diameter discharge districts double downcast drifts Engineering equal explosion feet of air feet per minute feet square fire-damp flame formula furnace gallery gases gauze hence horse-power inches of mercury inches water-gauge increased inflammable ksv2 length Manual marsh-gas measured mechanical ventilators Mechanics mercury method miners morocco motive-column Mueseler lamp multiplied number of revolutions oxygen perimeter piston pounds per square pressure per square pressure required proportional quan quantity of air regulators resistance revolutions per minute rubbing-surface safety-lamp sectional area shaft shutter smaller airway splitting square feet square foot Suppose temperature Text-book tion tity total pressure Treatise tube upcast velocity ventilating pressure volume of air water-gauge
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