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 18
... weight of the rods themselves . Rods 1 inch square weigh about 1 ton for every 200 yards . In deep holes not only does this great weight injure the screw joints , alter the structure of the iron , and break the tool which receives the ...
... weight of the rods themselves . Rods 1 inch square weigh about 1 ton for every 200 yards . In deep holes not only does this great weight injure the screw joints , alter the structure of the iron , and break the tool which receives the ...
Seite 26
... weight of the drill rods hanging on the piston is supported by this body of water , which is incompressible , and entirely prevents the dropping of the rods . Hence the hydraulic feed continues downwards as regu- larly in the cavities ...
... weight of the drill rods hanging on the piston is supported by this body of water , which is incompressible , and entirely prevents the dropping of the rods . Hence the hydraulic feed continues downwards as regu- larly in the cavities ...
Seite 33
... weight of the rods , which was reduced to the lowest limit by employing Mannesmann seamless steel tubes in place of iron ; but even then at 6561 feet the total weight was 13.707 tons , and at this depth it took 10 hours to draw the rods ...
... weight of the rods , which was reduced to the lowest limit by employing Mannesmann seamless steel tubes in place of iron ; but even then at 6561 feet the total weight was 13.707 tons , and at this depth it took 10 hours to draw the rods ...
Seite 45
... weight , the facility with which it may be set and used in different positions , and the wearing . capacity of the machine itself . The rate of boring depends entirely on the form of the cutting tool and the quality of the steel ...
... weight , the facility with which it may be set and used in different positions , and the wearing . capacity of the machine itself . The rate of boring depends entirely on the form of the cutting tool and the quality of the steel ...
Seite 65
... weight falls , the slack is drawn up , and the cable accommodates itself . To still further reduce the probability of severance , the cables at Plymouth Colliery † are protected by a double sheath of No. 8 steel wire on the outside of ...
... weight falls , the slack is drawn up , and the cable accommodates itself . To still further reduce the probability of severance , the cables at Plymouth Colliery † are protected by a double sheath of No. 8 steel wire on the outside of ...
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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