A Treatise on Practical and Theoretical Mine VentilationJ. Wiley & sons, 1900 - 141 sivua |
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Tulokset 1 - 5 kokonaismäärästä 10
Sivu 29
... employed in the ventilation of collieries by plans and sections . At that time the only light used in coal - mines was the candle made of sheep or ox tallow , the § 13 . 29 MINE VENTILATION . 222 CHAPTER III Safety-Lamps.
... employed in the ventilation of collieries by plans and sections . At that time the only light used in coal - mines was the candle made of sheep or ox tallow , the § 13 . 29 MINE VENTILATION . 222 CHAPTER III Safety-Lamps.
Sivu 37
... Colliery , in 1853 , to ascertain at what velocity the flame may be passed in an explosive mixture of fire - damp , were as follows : Davy lamp when moving 13 ′ per second . Clanny lamp went out at 17 ′ per second . Boty lamp passed ...
... Colliery , in 1853 , to ascertain at what velocity the flame may be passed in an explosive mixture of fire - damp , were as follows : Davy lamp when moving 13 ′ per second . Clanny lamp went out at 17 ′ per second . Boty lamp passed ...
Sivu 72
... colliery , which , over a small area , has many openings to the day of great sectional area but of little length , requires little or no mechanical ventilation . When the pits are less numerous , and the galleries are longer , we should ...
... colliery , which , over a small area , has many openings to the day of great sectional area but of little length , requires little or no mechanical ventilation . When the pits are less numerous , and the galleries are longer , we should ...
Sivu 73
... collieries alone , where this system of ventilation was adopted ( Lundhill and Risca ) , three hundred and twenty - nine lives were lost . The tendency of a current of air is naturally to choose , in passing from point to point , the ...
... collieries alone , where this system of ventilation was adopted ( Lundhill and Risca ) , three hundred and twenty - nine lives were lost . The tendency of a current of air is naturally to choose , in passing from point to point , the ...
Sivu 92
... COLLIERY EXPLOSIONS . 35. Much has been written and said upon this sub- ject , yet every now and then the public is startled with news of a recent explosion where numbers of lives have been lost . The investigations which follow are not ...
... COLLIERY EXPLOSIONS . 35. Much has been written and said upon this sub- ject , yet every now and then the public is startled with news of a recent explosion where numbers of lives have been lost . The investigations which follow are not ...
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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