A Treatise on Practical and Theoretical Mine VentilationJ. Wiley & Sons, 1904 - 141 sivua |
Kirjan sisältä
Tulokset 1 - 5 kokonaismäärästä 18
Sivu 38
... place after from five to ten seconds when the velocity is 9.84 ' , and after from two to five seconds when the speed ... section of the chimney at the top , or on its height , but rests essentially in the regularity of the draught ...
... place after from five to ten seconds when the velocity is 9.84 ' , and after from two to five seconds when the speed ... section of the chimney at the top , or on its height , but rests essentially in the regularity of the draught ...
Sivu 42
... sectional area of an airway is found by multiplying its height by its width . Thus the area of an airway 5 ' x 6 ' is 30 square feet . The rubbing - surface is found by multiplying the perime- eter by the length of the airway . Problem ...
... sectional area of an airway is found by multiplying its height by its width . Thus the area of an airway 5 ' x 6 ' is 30 square feet . The rubbing - surface is found by multiplying the perime- eter by the length of the airway . Problem ...
Sivu 43
... surface . 17. In large airways the friction will be less than in smaller airways the sum of whose areas are equal to the area of the large airway . Let us suppose an airway twelve feet square in section : its area will be 144 square ...
... surface . 17. In large airways the friction will be less than in smaller airways the sum of whose areas are equal to the area of the large airway . Let us suppose an airway twelve feet square in section : its area will be 144 square ...
Sivu 48
... area of section with air at 32 ° . 1.32529 × 30 459 +32 × 0.26881 = 0.0217 pound per square foot . When we consider the air - column , we may use the co - efficient 0.26881 ; afterwards , if we desire , we may reduce the height of the ...
... area of section with air at 32 ° . 1.32529 × 30 459 +32 × 0.26881 = 0.0217 pound per square foot . When we consider the air - column , we may use the co - efficient 0.26881 ; afterwards , if we desire , we may reduce the height of the ...
Sivu 49
... sectional area in square feet . k = co - efficient of friction = 0.0217 pounds per square foot of area of section for a velocity of 1000 feet per minute with air at 32 ° . It is to be taken in the same terms or unit as p is taken in . 8 ...
... sectional area in square feet . k = co - efficient of friction = 0.0217 pounds per square foot of area of section for a velocity of 1000 feet per minute with air at 32 ° . It is to be taken in the same terms or unit as p is taken in . 8 ...
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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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