A Treatise on Practical and Theoretical Mine VentilationJ. Wiley & sons, 1900 - 141 sivua |
Kirjan sisältä
Tulokset 1 - 5 kokonaismäärästä 16
Sivu v
... Motive - Column . Head of Air . ― § 12. Variation of Temperature , Effects of 27 222 23 25 CHAPTER III . § 13. Safety - Lamps § 14. Comparison of Safety - Lamps and their Efficiency § 14a . Detection of Fire - Damp · 29 37 39 25585 ...
... Motive - Column . Head of Air . ― § 12. Variation of Temperature , Effects of 27 222 23 25 CHAPTER III . § 13. Safety - Lamps § 14. Comparison of Safety - Lamps and their Efficiency § 14a . Detection of Fire - Damp · 29 37 39 25585 ...
Sivu 25
... motive - column " is a " head of air " of such a height that it will equal the difference between the weight of the downcast and upcast columns of air . Let M = the motive - column , or head of air , D = the depth of the upcast in feet ...
... motive - column " is a " head of air " of such a height that it will equal the difference between the weight of the downcast and upcast columns of air . Let M = the motive - column , or head of air , D = the depth of the upcast in feet ...
Sivu 26
... motive - column which would pro- duce a pressure of 3.906 pounds when the upcast has a depth of 900 feet and a temperature of 72 ° , and the downcast has the same depth and a temperature of 42 ° . Substituting in formula 5 we have M ...
... motive - column which would pro- duce a pressure of 3.906 pounds when the upcast has a depth of 900 feet and a temperature of 72 ° , and the downcast has the same depth and a temperature of 42 ° . Substituting in formula 5 we have M ...
Sivu 27
Eugene Benjamin Wilson. When calculating the weight of the motive - column , we must bear in mind that it is not the total amount of air , or the total number of cubic feet , that we seek , but the length of an air - column which has for ...
Eugene Benjamin Wilson. When calculating the weight of the motive - column , we must bear in mind that it is not the total amount of air , or the total number of cubic feet , that we seek , but the length of an air - column which has for ...
Sivu 44
... motive - column , or water - gauge . The motive - column has already been treated of , so our atten- tion may be given to the water - gauge . The water- gauge is an instrument used to measure the dynamic force of a current of air . It ...
... motive - column , or water - gauge . The motive - column has already been treated of , so our atten- tion may be given to the water - gauge . The water- gauge is an instrument used to measure the dynamic force of a current of air . It ...
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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