A Text-book of Coal-mining: For the Use of Colliery Managers and OthersCharles Griffin & Company, 1904 - 563 Seiten |
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Seite vi
... much as they deserve to be . All the figures elucidating the text have been specially drawn for this work , the majority having been reduced from original working drawings . In conclusion , I have to express my cordial thanks.
... much as they deserve to be . All the figures elucidating the text have been specially drawn for this work , the majority having been reduced from original working drawings . In conclusion , I have to express my cordial thanks.
Seite 19
... reduced in a marked manner the breakages of tools and rods , and consequently the cost of boring . It is , however , in- applicable in dry and narrow holes , is somewhat complicated , and causes the water to form streams , whilst the ...
... reduced in a marked manner the breakages of tools and rods , and consequently the cost of boring . It is , however , in- applicable in dry and narrow holes , is somewhat complicated , and causes the water to form streams , whilst the ...
Seite 27
... reduced the breakage and grinding of cores at the bottom of the hole , which so materially increases the power required for turning the tool and augments the amount of débris to be removed . The modified crown was put to work on 12th ...
... reduced the breakage and grinding of cores at the bottom of the hole , which so materially increases the power required for turning the tool and augments the amount of débris to be removed . The modified crown was put to work on 12th ...
Seite 30
... reduced , as the tool has now to pass through the tubes . In order to prevent this , before inserting the first length , the hole is slightly enlarged by a tool called a " reamer , " which is very similar to the " bell , " except that ...
... reduced , as the tool has now to pass through the tubes . In order to prevent this , before inserting the first length , the hole is slightly enlarged by a tool called a " reamer , " which is very similar to the " bell , " except that ...
Seite 33
... 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 , and as long to lower them ...
... 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 , and as long to lower them ...
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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