Bulletin, Tema 245U.S. Government Printing Office, 1927 |
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Página 2
... feet thick and in three benches. The top and bottom benches were considered impure, and only the middle bench (8 feet thick) was mined. After first and second mining of this bench the whole bed was marked on the maps as completely ...
... feet thick and in three benches. The top and bottom benches were considered impure, and only the middle bench (8 feet thick) was mined. After first and second mining of this bench the whole bed was marked on the maps as completely ...
Página 3
... thick beds against the high cost of the thin beds. The increased output could be handled without increasing the overhead. DISTRIBUTION OF TEIN COAL BEDS Thin beds occur in both the flat and the steep pitching ... Thickness of bed, feet Area,
... thick beds against the high cost of the thin beds. The increased output could be handled without increasing the overhead. DISTRIBUTION OF TEIN COAL BEDS Thin beds occur in both the flat and the steep pitching ... Thickness of bed, feet Area,
Página 4
thick. Only 42 per cent of the tonnage in the thin beds has been developed ... feet thick, Eastern Middle field These data also show that the beds that are over 5 feet thick have been developed most ... Feet Per cent Feet Per cent 5 to 6 66.4.
thick. Only 42 per cent of the tonnage in the thin beds has been developed ... feet thick, Eastern Middle field These data also show that the beds that are over 5 feet thick have been developed most ... Feet Per cent Feet Per cent 5 to 6 66.4.
Página 5
... feet thick, Western Middle field A large available supply of coal in the thin beds is indicated, as the thicker beds have been worked more extensively. The United States Coal Commission estimated that there were originaly 4,596 ...
... feet thick, Western Middle field A large available supply of coal in the thin beds is indicated, as the thicker beds have been worked more extensively. The United States Coal Commission estimated that there were originaly 4,596 ...
Página 6
... feet thick, anthracite field As has been stated already for the Southern field, the percentages are only approximate, because the reserve tonnage in each of the fields can not be definitely estimated, but they are more nearly correct ...
... feet thick, anthracite field As has been stated already for the Southern field, the percentages are only approximate, because the reserve tonnage in each of the fields can not be definitely estimated, but they are more nearly correct ...
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Términos y frases comunes
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
Pasajes populares
Página 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.
Página 1 - Mining of Thin Coal Beds in the Anthracite Region of Pennsylvania, by DC Ashmead.
Página 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...