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 83
Seite xi
... Roof Timbering Joints . Chocks or Cogs Double Timbering . 151 PAGE PAGE • 151 Courrières Method Driving through Loose Ground • 159 160 • 152 Preservation of Timber 161 152 Strength of Timber . 162 153 Withdrawing Timber . . 163 154 Iron ...
... Roof Timbering Joints . Chocks or Cogs Double Timbering . 151 PAGE PAGE • 151 Courrières Method Driving through Loose Ground • 159 160 • 152 Preservation of Timber 161 152 Strength of Timber . 162 153 Withdrawing Timber . . 163 154 Iron ...
Seite 3
... roof it is a down - throw , while , if struck on the floor first , it is an up - throw . Again , rocks before breaking usually yield to bending a little , and such signs are very useful to the miner , especially where the hade of fault ...
... roof it is a down - throw , while , if struck on the floor first , it is an up - throw . Again , rocks before breaking usually yield to bending a little , and such signs are very useful to the miner , especially where the hade of fault ...
Seite 12
... roof , and these are filled with accumulations of gas ; a crack is by some means formed , and an out- burst of gas results . This action is guarded against in some collieries by a regular system of putting bore - holes up in the roof ...
... roof , and these are filled with accumulations of gas ; a crack is by some means formed , and an out- burst of gas results . This action is guarded against in some collieries by a regular system of putting bore - holes up in the roof ...
Seite 44
... roof , the crank handle cannot be completely rotated , but has to be worked back wards and forwards , and a ratchet employed , thus all the time devoted to one - half the motion is lost . To remove this disadvantage the crank - 44 TEXT ...
... roof , the crank handle cannot be completely rotated , but has to be worked back wards and forwards , and a ratchet employed , thus all the time devoted to one - half the motion is lost . To remove this disadvantage the crank - 44 TEXT ...
Seite 65
... roof or sides , and consequent sparking , the general method is to allow plenty of " slack " between the points of support , so that , if a weight falls , the slack is drawn up , and the cable accommodates itself . To still further ...
... roof or sides , and consequent sparking , the general method is to allow plenty of " slack " between the points of support , so that , if a weight falls , the slack is drawn up , and the cable accommodates itself . To still further ...
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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