Bulletin, Masalah 245U.S. Government Printing Office, 1927 |
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Halaman v
... driven in pillar in reverse mining 80 45. Face of working place, showing condition after all the coal in one of the old pillars has been removed 81 46. Block system of mining bed at No. 7 colliery of Susquehanna Collieries Co., at ...
... driven in pillar in reverse mining 80 45. Face of working place, showing condition after all the coal in one of the old pillars has been removed 81 46. Block system of mining bed at No. 7 colliery of Susquehanna Collieries Co., at ...
Halaman 6
... driven and the chambers and breasts turned off and driven where the coal was good. If the coal became poor, development stopped, as the market would not take inferior grades. If the coal in any section was exceptionally good, that ...
... driven and the chambers and breasts turned off and driven where the coal was good. If the coal became poor, development stopped, as the market would not take inferior grades. If the coal in any section was exceptionally good, that ...
Halaman 6
... driven and the chambers and breasts turned off and driven where the coal was good. If the coal became poor, development stopped, as the market would not take inferior grades. If the coal in any section was exceptionally good, that ...
... driven and the chambers and breasts turned off and driven where the coal was good. If the coal became poor, development stopped, as the market would not take inferior grades. If the coal in any section was exceptionally good, that ...
Halaman 13
... driven 12. proximately every 300 feet and are driven on the counter of the coal MINING OF ADJACENT BEDS 13. Section A B Roof, sandstone: Feet Inches 10 Feet Inches Coal 1 2 6 7 6 Bone 5 2 2 3 1 5 1 4 3 9 8 8 9 5 Rock... Rock... Bone Rock ...
... driven 12. proximately every 300 feet and are driven on the counter of the coal MINING OF ADJACENT BEDS 13. Section A B Roof, sandstone: Feet Inches 10 Feet Inches Coal 1 2 6 7 6 Bone 5 2 2 3 1 5 1 4 3 9 8 8 9 5 Rock... Rock... Bone Rock ...
Halaman 14
... driven to within 30 feet of an airway of the heading above. These rooms are 10 feet wide and are cut through the No. 2 Dunmore bed, the parting rock, and the No. 3 Dunmore bed ; then enough coal is removed from the bottom bed of the No ...
... driven to within 30 feet of an airway of the heading above. These rooms are 10 feet wide and are cut through the No. 2 Dunmore bed, the parting rock, and the No. 3 Dunmore bed ; then enough coal is removed from the bottom bed of the No ...
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Istilah dan frasa umum
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
Bagian yang populer
Halaman 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.
Halaman 1 - Mining of Thin Coal Beds in the Anthracite Region of Pennsylvania, by DC Ashmead.
Halaman 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...