A Text-book of Coal-mining: For the Use of Colliery Managers and OthersCharles Griffin & Company, 1904 - 563 Seiten |
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Ergebnisse 1-5 von 37
Seite 47
... motors with intermediate warming receivers are insur mountable in many of the operations in which compressed air is used in mines , but the difficulties can be overcome if , instead of endeavouring to compound each motor separately ...
... motors with intermediate warming receivers are insur mountable in many of the operations in which compressed air is used in mines , but the difficulties can be overcome if , instead of endeavouring to compound each motor separately ...
Seite 48
... motors are not compound , but the air is conveyed from one engine to another engine , the first being the high ... motor to the other , and during its passage abstracted sufficient heat from the hot air of the mine to come back to ...
... motors are not compound , but the air is conveyed from one engine to another engine , the first being the high ... motor to the other , and during its passage abstracted sufficient heat from the hot air of the mine to come back to ...
Seite 55
... motors through pipes , and a loss of work takes place from friction , governed by the following laws :-( 1 ... motor . By using pipes of large diameter , the loss from the two latter laws can be kept within narrow limits , but ...
... motors through pipes , and a loss of work takes place from friction , governed by the following laws :-( 1 ... motor . By using pipes of large diameter , the loss from the two latter laws can be kept within narrow limits , but ...
Seite 56
... motor , which serves the double purpose of not only heating the air , but helps to pack the piston . It , however , introduces this disadvantage that the exhaust ports are likely to choke up with ice through the moisture freezing ; but ...
... motor , which serves the double purpose of not only heating the air , but helps to pack the piston . It , however , introduces this disadvantage that the exhaust ports are likely to choke up with ice through the moisture freezing ; but ...
Seite 58
... motor is stationary and the current is switched on , there is no back pressure , and the field becomes strongly ... motor is to be used . They run at a constant speed , and give a constant voltage irrespective of variations in the load ...
... motor is stationary and the current is switched on , there is no back pressure , and the field becomes strongly ... motor is to be used . They run at a constant speed , and give a constant voltage irrespective of variations in the load ...
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alternating current amount angle Anthracite apparatus arrangement attached bars bolts boring bottom brake cage carbon carbonic acid carried cent centre chain coal coal-dust coils Colliery compressed connected consists cost cylinder depth distance drill driven drum employed engine explosion feet fire-damp fixed flange friction gear groove haulage hole inclined Inst iron lamp latter length lever lifted load longwall lower Lye Cross machine method mines motor obtained ordinary passes pieces pillars pipes piston placed plate plunger position pressure prevent props pulley pump quantity rails revolutions per minute roads rods roof rope round safety lamp screen screw seams Série shaft shown in Fig side sliding South Wales speed stall steam steel stroke surface timber tippler tool tube valve velocity ventilation vertical water gauge weight wheel winding winding engine wire yards