A Text-book of Coal-mining: For the Use of Colliery Managers and OthersCharles Griffin & Company, 1904 - 563 Seiten |
Im Buch
Ergebnisse 1-5 von 76
Seite 23
... lifting up the lever out of the way . The tools are then run up , but are stopped when the bit reaches the level of boring - floor , where it is loosened by large wrenches . tools are then lifted up clear of the hole , and the rope ...
... lifting up the lever out of the way . The tools are then run up , but are stopped when the bit reaches the level of boring - floor , where it is loosened by large wrenches . tools are then lifted up clear of the hole , and the rope ...
Seite 25
... lifted . C Fig . 28 . In the modern improved practice separate machinery is provided for pumping and rotating and raising the rods , thus dividing and minimising the risk of breakages . The drill is usually fed forward by the pressure ...
... lifted . C Fig . 28 . In the modern improved practice separate machinery is provided for pumping and rotating and raising the rods , thus dividing and minimising the risk of breakages . The drill is usually fed forward by the pressure ...
Seite 27
... lifted with them and extracted . When in operation a constant stream of water is passed down the annular space between the exterior of the core tube and the interior of the boring tube . This modified tube was employed at Villefranche ...
... lifted with them and extracted . When in operation a constant stream of water is passed down the annular space between the exterior of the core tube and the interior of the boring tube . This modified tube was employed at Villefranche ...
Seite 31
... lifted out . Fig . 35 . Fig . 36 . Fig 37 . Fig . 38 . Should the friction be too great to allow the casing to be removed in one length , it is cut through by the tool shown in Fig . 36. This is provided with a sharp cutting point a ...
... lifted out . Fig . 35 . Fig . 36 . Fig 37 . Fig . 38 . Should the friction be too great to allow the casing to be removed in one length , it is cut through by the tool shown in Fig . 36. This is provided with a sharp cutting point a ...
Seite 43
... lifted out by passing a cross - bar through the hole c . The charge and tamping are then put in , the latter in small quantities at a time , each quantity being successively rammed with the tamping - rod , which consists of a bar having ...
... lifted out by passing a cross - bar through the hole c . The charge and tamping are then put in , the latter in small quantities at a time , each quantity being successively rammed with the tamping - rod , which consists of a bar having ...
Inhalt
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Häufige Begriffe und Wortgruppen
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