A Treatise on Practical and Theoretical Mine VentilationJ. Wiley & Sons, 1904 - 141 sivua |
Kirjan sisältä
Tulokset 1 - 5 kokonaismäärästä 29
Sivu v
... Column . - Head of Air . § 12. Variation of Temperature , Effects of 23 225 25 27 CHAPTER III . 25885 29 37 39 V § 13. Safety - Lamps § 14. Comparison of Safety - Lamps and their Efficiency § 14a . Detection of Fire - Damp § 17 ...
... Column . - Head of Air . § 12. Variation of Temperature , Effects of 23 225 25 27 CHAPTER III . 25885 29 37 39 V § 13. Safety - Lamps § 14. Comparison of Safety - Lamps and their Efficiency § 14a . Detection of Fire - Damp § 17 ...
Sivu 2
... column . of mercury thirty inches in height at sea - level . The temperature of the atmosphere is not the same through- out : it becomes colder as we ascend ; hence on the top of high mountains we find snow the year round . That air has ...
... column . of mercury thirty inches in height at sea - level . The temperature of the atmosphere is not the same through- out : it becomes colder as we ascend ; hence on the top of high mountains we find snow the year round . That air has ...
Sivu 3
... column of mercury whose base is one inch square , and whose height is thirty inches , it must press down with a weight equal to the weight of the mercury of the above dimensions to balance it . The weight of this mercury is 14.7225 ...
... column of mercury whose base is one inch square , and whose height is thirty inches , it must press down with a weight equal to the weight of the mercury of the above dimensions to balance it . The weight of this mercury is 14.7225 ...
Sivu 22
... column which will produce by its weight a velocity equal to v . If this velocity be repre- sented in feet per minute , we shall have and ( 3 ) v = 8.0208√ × 60 = 481.2√π , ( 4 ) h = v2 ( 481.2 ) 2 = v2 231,600 These formulæ ( 2 ) ...
... column which will produce by its weight a velocity equal to v . If this velocity be repre- sented in feet per minute , we shall have and ( 3 ) v = 8.0208√ × 60 = 481.2√π , ( 4 ) h = v2 ( 481.2 ) 2 = v2 231,600 These formulæ ( 2 ) ...
Sivu 23
... column required being from ten to twenty times as much in order to overcome the friction and resist- ance of airways , etc. , in underground workings ; and , were it not for these resistances , very small pressure would suffice to ...
... column required being from ten to twenty times as much in order to overcome the friction and resist- ance of airways , etc. , in underground workings ; and , were it not for these resistances , very small pressure would suffice to ...
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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
Suositut otteet
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