A Treatise on Practical and Theoretical Mine VentilationJ. Wiley & sons, 1900 - 141 sivua |
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Sivu 23
... . Suppose we have two shafts ( connected , as in the above figure ) of equal depths , the air in them having B D - - the same temperature and density throughout . If § 10 . 23 MINE VENTILATION . CHAPTER II Natural Ventilation.
... . Suppose we have two shafts ( connected , as in the above figure ) of equal depths , the air in them having B D - - the same temperature and density throughout . If § 10 . 23 MINE VENTILATION . CHAPTER II Natural Ventilation.
Sivu 24
... shafts , and the column AB lower in temperature than CD , a movement of the air then takes place from A towards C. On the contrary , if the external air be warmer than that of the shafts , the shaft AB will be the upcast , and circu ...
... shafts , and the column AB lower in temperature than CD , a movement of the air then takes place from A towards C. On the contrary , if the external air be warmer than that of the shafts , the shaft AB will be the upcast , and circu ...
Sivu 25
Eugene Benjamin Wilson. ventilation . Suppose the two shafts to be of equal depth , say 900 feet , and suppose the barometer to stand at 29 inches ; also let the temperature in the downcast be assumed to be 42 ° , and that of the upcast ...
Eugene Benjamin Wilson. ventilation . Suppose the two shafts to be of equal depth , say 900 feet , and suppose the barometer to stand at 29 inches ; also let the temperature in the downcast be assumed to be 42 ° , and that of the upcast ...
Sivu 26
... shafts make no differ- ence upon the total pressure , so far as the considera- tions regarding ventilation are concerned . This is termed “ the pneumatic paradox ; " for if we have one square foot area for a downcast , and an upcast of ...
... shafts make no differ- ence upon the total pressure , so far as the considera- tions regarding ventilation are concerned . This is termed “ the pneumatic paradox ; " for if we have one square foot area for a downcast , and an upcast of ...
Sivu 27
... shafts , which are equal in length ? Pounds . 900 cubic feet of air at 42 ° F. 71.406 900 cubic feet of air at 2020 F. = = 54.126 Difference in weight • • 17.280 Suppose , now , the temperature of the downcast to be raised to 82 ° F ...
... shafts , which are equal in length ? Pounds . 900 cubic feet of air at 42 ° F. 71.406 900 cubic feet of air at 2020 F. = = 54.126 Difference in weight • • 17.280 Suppose , now , the temperature of the downcast to be raised to 82 ° F ...
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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