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 100
Seite 16
... bottom of the hole is removed by the " sludger " ( Fig . 13 ) , which consists of a tube from 4 to 6 feet long , having a valve at the bottom , either of the ball or flap - door type . The removal is usually done with a rope , some ...
... bottom of the hole is removed by the " sludger " ( Fig . 13 ) , which consists of a tube from 4 to 6 feet long , having a valve at the bottom , either of the ball or flap - door type . The removal is usually done with a rope , some ...
Seite 21
... bottom of cylinder , preventing any chance of the latter receiving a blow on the return stroke . The boring head ( Fig . 23 ) consists of an iron bar about 8 feet long , having a cast - iron boss a at the bottom , into which the cutting ...
... bottom of cylinder , preventing any chance of the latter receiving a blow on the return stroke . The boring head ( Fig . 23 ) consists of an iron bar about 8 feet long , having a cast - iron boss a at the bottom , into which the cutting ...
Seite 26
... bottom of the piston , it follows that the water cannot escape from the bottom of the cylinder faster than it enters at the top . Hence the lower part of the cylinder is always full of water , and in case a cavity is struck the weight ...
... bottom of the piston , it follows that the water cannot escape from the bottom of the cylinder faster than it enters at the top . Hence the lower part of the cylinder is always full of water , and in case a cavity is struck the weight ...
Seite 27
... bottom of the hole , which so materially increases the power required for turning the tool and augments the amount of débris to be removed . The modified crown was put to work on 12th Oct. , 1876 , when the boring had reached 16847 feet ...
... bottom of the hole , which so materially increases the power required for turning the tool and augments the amount of débris to be removed . The modified crown was put to work on 12th Oct. , 1876 , when the boring had reached 16847 feet ...
Seite 28
... bottom with dirt . This débris took 18 days to clear out , and then the hole was bored a further distance of 3 feet ... bottom of the original hole , the remaining 88 per cent . being occupied with breakages . This is , of course , a ...
... bottom with dirt . This débris took 18 days to clear out , and then the hole was bored a further distance of 3 feet ... bottom of the original hole , the remaining 88 per cent . being occupied with breakages . This is , of course , a ...
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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