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 x
... OPERATIONS . Underground Roads Means of. Adelaide Drill Brandt Drill Efficiency Power Machine Drills Ingersoll Drill ... Operation of getting down to Dealing with Water · 129 " Stone Head " ( a ) Where the Ground is mod- erately hard 113 ...
... OPERATIONS . Underground Roads Means of. Adelaide Drill Brandt Drill Efficiency Power Machine Drills Ingersoll Drill ... Operation of getting down to Dealing with Water · 129 " Stone Head " ( a ) Where the Ground is mod- erately hard 113 ...
Seite xi
... OPERATIONS . Underground Roads Means of keeping Direction Means of keeping Gradient Operation of Driving Ventilation Supporting Roof Timbering Joints . Chocks or Cogs Double Timbering . 151 PAGE PAGE • 151 Courrières Method Driving ...
... OPERATIONS . Underground Roads Means of keeping Direction Means of keeping Gradient Operation of Driving Ventilation Supporting Roof Timbering Joints . Chocks or Cogs Double Timbering . 151 PAGE PAGE • 151 Courrières Method Driving ...
Seite 9
... operations . The coke is brittle . The table ( p . 8 ) shows the percentage composition of different classes of coal ... operation being performed in an instrument called a calorimeter . The most convenient of these for prac- tical ...
... operations . The coke is brittle . The table ( p . 8 ) shows the percentage composition of different classes of coal ... operation being performed in an instrument called a calorimeter . The most convenient of these for prac- tical ...
Seite 14
... operations in searching for coal in new districts , consist in carefully examining surface indications to determine ... operation of boring is generally resorted to . Choice of Site . - For proving considerable areas several holes may ...
... operations in searching for coal in new districts , consist in carefully examining surface indications to determine ... operation of boring is generally resorted to . Choice of Site . - For proving considerable areas several holes may ...
Seite 16
... operation to be easily carried out , a swivel joint is intro- duced . As the depth of the hole slowly increases the rods necessarily descend , being allowed to do so by the use of an instrument called the " stirrup " ( Fig . 10 ) ...
... operation to be easily carried out , a swivel joint is intro- duced . As the depth of the hole slowly increases the rods necessarily descend , being allowed to do so by the use of an instrument called the " stirrup " ( Fig . 10 ) ...
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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