A Treatise on Practical and Theoretical Mine VentilationJ. Wiley & sons, 1900 - 141 sivua |
Kirjan sisältä
Tulokset 1 - 5 kokonaismäärästä 6
Sivu 32
... gauze , composed of wires from one- fortieth to one - sixtieth of an inch in diameter , and containing twenty - eight wires , or seven hundred and eighty - four apertures to the inch , was safe under all circumstances . " The process by ...
... gauze , composed of wires from one- fortieth to one - sixtieth of an inch in diameter , and containing twenty - eight wires , or seven hundred and eighty - four apertures to the inch , was safe under all circumstances . " The process by ...
Sivu 33
... gauze ; and , instead of air passing through the perforated plate , it passes through the meshes of the gauze ( Fig . 1 ) . The Davy lamp differs from the Stephenson , inasmuch as the former admits air through the meshes of the wire on ...
... gauze ; and , instead of air passing through the perforated plate , it passes through the meshes of the gauze ( Fig . 1 ) . The Davy lamp differs from the Stephenson , inasmuch as the former admits air through the meshes of the wire on ...
Sivu 34
... gauze remain uninjured . Upon these principles , various modifications have been made to these lamps , until they now number a hundred or more . The Clanny lamp consists of a cylinder of glass around. 34 § 13 . MINE VENTILATION .
... gauze remain uninjured . Upon these principles , various modifications have been made to these lamps , until they now number a hundred or more . The Clanny lamp consists of a cylinder of glass around. 34 § 13 . MINE VENTILATION .
Sivu 35
... gauze top . A better light is pro- duced by this combination ( Fig . 2 ) . The figures show the different lamps , with permutation - lock capable of PHOTO ELECTRO FIG . 4 . FIG . 5 . many thousand changes , so that no one but the fire ...
... gauze top . A better light is pro- duced by this combination ( Fig . 2 ) . The figures show the different lamps , with permutation - lock capable of PHOTO ELECTRO FIG . 4 . FIG . 5 . many thousand changes , so that no one but the fire ...
Sivu 36
... gauze at the top . The Boty lamp has a glass cylinder with a gauze top , but the air is admitted through a perforated copper ring at the bottom of the lamp . The Eloin lamp has a glass cylinder , admitting air through wire gauze near ...
... gauze at the top . The Boty lamp has a glass cylinder with a gauze top , but the air is admitted through a perforated copper ring at the bottom of the lamp . The Eloin lamp has a glass cylinder , admitting air through wire gauze near ...
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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