A Treatise on Practical and Theoretical Mine VentilationJ. Wiley & Sons, 1904 - 141 sivua |
Kirjan sisältä
Tulokset 1 - 5 kokonaismäärästä 28
Sivu 23
... resistances , very small pressure would suffice to produce great velocity . CHAPTER II . NATURAL VENTILATION . 10. MOTION in air is caused by pressure , or differ- ence of pressure . When air becomes heated , it ascends , because it ...
... resistances , very small pressure would suffice to produce great velocity . CHAPTER II . NATURAL VENTILATION . 10. MOTION in air is caused by pressure , or differ- ence of pressure . When air becomes heated , it ascends , because it ...
Sivu 41
... resistance called " friction . " Friction of air in mines is so great , that , out of every ten parts of power employed for the ventilation of a mine , about nine of the ten are used in overcoming the resistance to ventilation . As the ...
... resistance called " friction . " Friction of air in mines is so great , that , out of every ten parts of power employed for the ventilation of a mine , about nine of the ten are used in overcoming the resistance to ventilation . As the ...
Sivu 42
... resistance in comparison with elbows or square bends . The con- sideration of the movements of air in mines or confined passages involves its density , the area , length , and pe- rimeter of the airways , also the velocity with which ...
... resistance in comparison with elbows or square bends . The con- sideration of the movements of air in mines or confined passages involves its density , the area , length , and pe- rimeter of the airways , also the velocity with which ...
Sivu 43
... smaller airways , its perimeter is much smaller than the aggregate perime- ters of the lesser airways . 18. The force used to overcome the resistances offered to the passage of air in mines is estimated § 18 . 43 MINE VENTILATION .
... smaller airways , its perimeter is much smaller than the aggregate perime- ters of the lesser airways . 18. The force used to overcome the resistances offered to the passage of air in mines is estimated § 18 . 43 MINE VENTILATION .
Sivu 44
... resistance to the air in the mine . In some gauges , oil is substituted for water . They are made in differ- ent shapes ; but the principle is the same in all . The weight of one cubic foot of water at 62 ° F. and 30 " barometrical ...
... resistance to the air in the mine . In some gauges , oil is substituted for water . They are made in differ- ent shapes ; but the principle is the same in all . The weight of one cubic foot of water at 62 ° F. and 30 " barometrical ...
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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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