A Text-book of Coal-mining: For the Use of Colliery Managers and OthersCharles Griffin & Company, 1904 - 563 Seiten |
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Seite 3
... takes place . Conformable and Unconformable Strata . - Subsidence has taken place in all times , but when this action was uniform , bed succeeded bed in regular order , and produced what are called conform- able strata ( Fig . 5 ) ...
... takes place . Conformable and Unconformable Strata . - Subsidence has taken place in all times , but when this action was uniform , bed succeeded bed in regular order , and produced what are called conform- able strata ( Fig . 5 ) ...
Seite 5
... takes place by the elimination of oxygen , which com- bines with carbon to form carbonic acid gas and by the separation of carburetted hydrogen ( " fire damp " of the miner THE OCCURRENCE AND COMPOSITION OF COAL . 5 Definition of Coal ...
... takes place by the elimination of oxygen , which com- bines with carbon to form carbonic acid gas and by the separation of carburetted hydrogen ( " fire damp " of the miner THE OCCURRENCE AND COMPOSITION OF COAL . 5 Definition of Coal ...
Seite 8
... take place . Coal may contain such a large proportion of ash as to be practically worthless as a fuel . The amount of ... takes place slowly , and may be observed by the singing noted at the working places in fiery seams of coal , or by ...
... take place . Coal may contain such a large proportion of ash as to be practically worthless as a fuel . The amount of ... takes place slowly , and may be observed by the singing noted at the working places in fiery seams of coal , or by ...
Seite 10
... take place . Coal may contain such a large proportion of ash as to be practically worthless as a fuel . The amount of ... takes place slowly , and may be observed by the singing noted at the working places in fiery seams of coal , or by ...
... take place . Coal may contain such a large proportion of ash as to be practically worthless as a fuel . The amount of ... takes place slowly , and may be observed by the singing noted at the working places in fiery seams of coal , or by ...
Seite 21
... takes place , so that the flat rope is actually twisted through the space of one tooth . As soon as the lift takes place it untwists itself , and so rotates the tool . The sludger is furnished with a clack at the bottom , and inside is ...
... takes place , so that the flat rope is actually twisted through the space of one tooth . As soon as the lift takes place it untwists itself , and so rotates the tool . The sludger is furnished with a clack at the bottom , and inside is ...
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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