A Treatise on Practical and Theoretical Mine VentilationJ. Wiley & Sons, 1904 - 141 sivua |
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Tulokset 1 - 5 kokonaismäärästä 18
Sivu 23
... air , rapidly or slowly . Suppose we have two shafts ( connected , as in the above figure ) of equal depths , the air in them having B the same temperature and density throughout . If no artificial § 10 . 23 MINE VENTILATION .
... air , rapidly or slowly . Suppose we have two shafts ( connected , as in the above figure ) of equal depths , the air in them having B the same temperature and density throughout . If no artificial § 10 . 23 MINE 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 ? 900 cubic feet of air at 42 ° F. 900 cubic feet of air at 202 ° F. Pounds . 71.406 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 ? 900 cubic feet of air at 42 ° F. 900 cubic feet of air at 202 ° F. Pounds . 71.406 54.126 Difference in weight · . • 17.280 Suppose , now , the temperature of the downcast to be raised to 82 ° F ...
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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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