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 70
Seite 16
... Levers . The most general way of working the rods in per- cussive boring is to attach them to the shorter arm of a lever ( Fig . 14 ) , the longer end of which receives an up - and - down motion ; as previously mentioned , the rods are ...
... Levers . The most general way of working the rods in per- cussive boring is to attach them to the shorter arm of a lever ( Fig . 14 ) , the longer end of which receives an up - and - down motion ; as previously mentioned , the rods are ...
Seite 17
... lever , so that more men are able to work at it . With cross - pieces 8 feet long , six men can work on each side . For deep holes manual labour is quite out of place , and the long end of the lever is depressed at intervals , either by ...
... lever , so that more men are able to work at it . With cross - pieces 8 feet long , six men can work on each side . For deep holes manual labour is quite out of place , and the long end of the lever is depressed at intervals , either by ...
Seite 18
... lever . The rope is then hoisted up until the limit in height is reached , when the stops are closed beneath the nearest joint , and the rods above that joint un- Figs . 16 and 17 . screwed and removed . This operation is repeated until ...
... lever . The rope is then hoisted up until the limit in height is reached , when the stops are closed beneath the nearest joint , and the rods above that joint un- Figs . 16 and 17 . screwed and removed . This operation is repeated until ...
Seite 19
... lever at the surface . By this means , the shocks received by the tool and lower rods do not reach the upper part . Mr. W. Wolski * is of opinion that the consideration of the proper length of the stroke of boring rods has been ...
... lever at the surface . By this means , the shocks received by the tool and lower rods do not reach the upper part . Mr. W. Wolski * is of opinion that the consideration of the proper length of the stroke of boring rods has been ...
Seite 22
... lever through the " stirrup " b . The lever receives an oscillating move- ment from a connecting - rod and crank turned by the band wheel . The length of stroke can be varied by adjusting a collar - pin in any one of several holes ...
... lever through the " stirrup " b . The lever receives an oscillating move- ment from a connecting - rod and crank turned by the band wheel . The length of stroke can be varied by adjusting a collar - pin in any one of several holes ...
Inhalt
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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