A Treatise on Practical and Theoretical Mine VentilationJ. Wiley & sons, 1900 - 141 sivua |
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Sivu 94
... dust floating in the air when compared with bituminous mines : however , we are not sure but that it may apply in ... coal - dust as it travels on its course , or from the force and flame assisted by an instantaneous emission of ...
... dust floating in the air when compared with bituminous mines : however , we are not sure but that it may apply in ... coal - dust as it travels on its course , or from the force and flame assisted by an instantaneous emission of ...
Sivu 95
... powder or fire - damp is much increased when coal - dust is present . " 4. That , on any partial vacuum being formed in an underground coal - working , fire - damp will instantly issue in dangerous quantity ; and there are fair grounds ...
... powder or fire - damp is much increased when coal - dust is present . " 4. That , on any partial vacuum being formed in an underground coal - working , fire - damp will instantly issue in dangerous quantity ; and there are fair grounds ...
Sivu 96
... coal - dust ; that in blasting with charges not exceeding twelve ounces , accompanied by the proper preparation of holing and side - cutting , there is little liability of this taking place . " To discard all shot - firing means , in ...
... coal - dust ; that in blasting with charges not exceeding twelve ounces , accompanied by the proper preparation of holing and side - cutting , there is little liability of this taking place . " To discard all shot - firing means , in ...
Sivu 136
... Coal - dust explosions , 94 . Co - efficient of friction , 47 . " Colliery Guardian , " 94 . Colliery warnings , 108 . Comparative economy of furnace and fan , 117 . Comparison of fans , 111 . of air and gases , 4 . Composition of air ...
... Coal - dust explosions , 94 . Co - efficient of friction , 47 . " Colliery Guardian , " 94 . Colliery warnings , 108 . Comparative economy of furnace and fan , 117 . Comparison of fans , 111 . of air and gases , 4 . Composition of air ...
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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