Bulletin, Issue 245U.S. Government Printing Office, 1927 |
From inside the book
Results 1-5 of 20
Page 17
... completed and there is some danger of MINING OF ADJACENT BEDS 17. Feet Inches Feet Inches Roof, "sulphur" rock: Roof, "sulphur" rock— Con. Coal and rock Coal - 5 1 4 2 4 2 1 1 4 S 1 4 6 "Slate" stone 2 Coal Bone Coal 3 Rock Bone Floor ...
... completed and there is some danger of MINING OF ADJACENT BEDS 17. Feet Inches Feet Inches Roof, "sulphur" rock: Roof, "sulphur" rock— Con. Coal and rock Coal - 5 1 4 2 4 2 1 1 4 S 1 4 6 "Slate" stone 2 Coal Bone Coal 3 Rock Bone Floor ...
Page 20
... completed. Later, mining of the Bottom Twin was considered economically possible, and the bed was opened. Here, again, came the difficulty of opening an underlying bed that was separated from an overlying first-mined bed by a ...
... completed. Later, mining of the Bottom Twin was considered economically possible, and the bed was opened. Here, again, came the difficulty of opening an underlying bed that was separated from an overlying first-mined bed by a ...
Page 20
... completed. Later, mining of the Bottom Twin was considered economically possible, and the bed was opened. Here, again, came the difficulty of opening an underlying bed that was separated from an overlying first-mined bed by a ...
... completed. Later, mining of the Bottom Twin was considered economically possible, and the bed was opened. Here, again, came the difficulty of opening an underlying bed that was separated from an overlying first-mined bed by a ...
Page 26
... completed, rock is dumped into it. If necessary, the rock is shifted by. brought from other sections of the mine to the gangway above and 26 MINING OF THIN COAL BEDS IN PENNSYLVANIA. Inches Inches Roof, sandstone: Parting, Are clay ...
... completed, rock is dumped into it. If necessary, the rock is shifted by. brought from other sections of the mine to the gangway above and 26 MINING OF THIN COAL BEDS IN PENNSYLVANIA. Inches Inches Roof, sandstone: Parting, Are clay ...
Page 33
... completed in the underlying beds of coal — that is, the No. 2 and No. 3 Dunmore — but wherever second mining has been completed in these two beds the room center in No. 1 Dunmore is 140 feet, with rooms 100 feet wide and a 40-foot ...
... completed in the underlying beds of coal — that is, the No. 2 and No. 3 Dunmore — but wherever second mining has been completed in these two beds the room center in No. 1 Dunmore is 140 feet, with rooms 100 feet wide and a 40-foot ...
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Common terms and phrases
advancing amount anthracite region approximately areas average block boreholes bottom break breasts capacity cars cent centers chamber clay coal colliery completed connecting continue conveyor cost cross developed difficulty district driven Dunmore employed engine extends face feet thick feet wide field Figure fire floor foot four gangway gives handling hard heading hoisting inches increased laborer length less lines loaded longwall lost lower machine method Middle miner mining methods Moisture moved necessary obtained opening Operating packed permit pillars pipe pitch possible present probably production props pulled recovered recovery removed roadways rock roof rope sandstone scraper second mining shaking chute shown shows side silt slice slope space surface Table taken territory thin beds timber turned Twin upper valley
Popular passages
Page 6 - ... programming any code may be produced. For example, if the data collected from experiments must be processed on machines which use only IBM code, the PDP-8 computer can be programmed ASCII to IBM. Figure 7 shows the alphabet in ASCII and comparison. Figure 6. High-speed punch. 12345 678 1234 z Y X W V U T S R Q P 0 N M L K J I H G F E D C B A 9 8 7 6 5 4 3 2 I 0 ASC II Figure 7.
Page 1 - Mining of Thin Coal Beds in the Anthracite Region of Pennsylvania, by DC Ashmead.
Page 67 - It was originated by a Catholic priest in the city of Shenandoah in 1864, who, in the hope of saving his church from destruction by subsidence...