A Treatise on Practical and Theoretical Mine VentilationJ. Wiley & sons, 1900 - 141 sivua |
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Tulokset 1 - 5 kokonaismäärästä 7
Sivu 54
... multiplied by the area in case of a thin plate ; ninety - three per cent in case of a short cylindrical tube ; and ninety - five per cent when the tube is conical , and the area taken from the small end . This contraction of the flowing ...
... multiplied by the area in case of a thin plate ; ninety - three per cent in case of a short cylindrical tube ; and ninety - five per cent when the tube is conical , and the area taken from the small end . This contraction of the flowing ...
Sivu 55
... multiplied by the area of section a of the airway in square feet . Thus , if the sectional area of the above airway were 64 square feet , and the pressure 0.5 - inch water - gauge , the total pressure would be pa = 64 × 2.6 166.4 pounds ...
... multiplied by the area of section a of the airway in square feet . Thus , if the sectional area of the above airway were 64 square feet , and the pressure 0.5 - inch water - gauge , the total pressure would be pa = 64 × 2.6 166.4 pounds ...
Sivu 61
... multiplied by the area . PROBLEMS TO ILLUSTRATE THE FOREGOING LAWS . 24. ( a ) If 20,000 cubic feet of air can be produced in an airway of 60 feet area with a certain pressure , how much air will the same pressure produce in an airway ...
... multiplied by the area . PROBLEMS TO ILLUSTRATE THE FOREGOING LAWS . 24. ( a ) If 20,000 cubic feet of air can be produced in an airway of 60 feet area with a certain pressure , how much air will the same pressure produce in an airway ...
Sivu 65
... multiplied by the square of the highest velocity is equal to the greater rubbing - surface mul- tiplied by the square of the lower velocity ; thus X 4 202500 , and X 16 202500 , and ( 9000 ) 2 ( 18000 ) ( +500 ) 3 × 1 = 202500 , if we ...
... multiplied by the square of the highest velocity is equal to the greater rubbing - surface mul- tiplied by the square of the lower velocity ; thus X 4 202500 , and X 16 202500 , and ( 9000 ) 2 ( 18000 ) ( +500 ) 3 × 1 = 202500 , if we ...
Sivu 78
... multiplied by a co - efficient to be determined by experi- ment . In the first case , the airways may be considered as a single airway , with a length 7 , a section 4a , and a perimeter 4p : the equation then becomes ( a ) 4pl Q2 X 4a ...
... multiplied by a co - efficient to be determined by experi- ment . In the first case , the airways may be considered as a single airway , with a length 7 , a section 4a , and a perimeter 4p : the equation then becomes ( a ) 4pl Q2 X 4a ...
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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