Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница xxvi
... distance of about 50 miles , the width varying from 5 to 30 miles . It has a similar structure to the Midland Coal - field , the western boundary being the mill- stone grit . Owing to its being on the coast , however , there is not the ...
... distance of about 50 miles , the width varying from 5 to 30 miles . It has a similar structure to the Midland Coal - field , the western boundary being the mill- stone grit . Owing to its being on the coast , however , there is not the ...
Страница xxvii
... distances of from 3 to ΙΟ miles . Coal has been worked under the sea here since the year 1872 at the North Seaton colliery . The royalties are payable to the Crown , the method of working most in favour being the long- wall system , in ...
... distances of from 3 to ΙΟ miles . Coal has been worked under the sea here since the year 1872 at the North Seaton colliery . The royalties are payable to the Crown , the method of working most in favour being the long- wall system , in ...
Страница xxviii
... to a central axis . The number of mines is about 43 . II . The Bristol and Somerset Coal - field extends from Cromhall on the north to Frome on the south , a distance of 26 miles , and from Bath on the east to Bristol xxviii MINING .
... to a central axis . The number of mines is about 43 . II . The Bristol and Somerset Coal - field extends from Cromhall on the north to Frome on the south , a distance of 26 miles , and from Bath on the east to Bristol xxviii MINING .
Страница xxix
... distance of 12 miles , and it includes a total area of about 238 square miles . A very large portion of this coal - field , amounting to about four - fifths of the whole , is covered by newer formations . The coal measures are divided ...
... distance of 12 miles , and it includes a total area of about 238 square miles . A very large portion of this coal - field , amounting to about four - fifths of the whole , is covered by newer formations . The coal measures are divided ...
Страница xxxviii
... distance . Australia will probably be also a large coal exporter . Therefore the time may arrive , very likely in the lifetime of many men now living , when the production of coal in Great Britain will become stationary , and that ...
... distance . Australia will probably be also a large coal exporter . Therefore the time may arrive , very likely in the lifetime of many men now living , when the production of coal in Great Britain will become stationary , and that ...
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Често срещани думи и фрази
air-current air-road anemometer bars bore-hole boring bottom brattice brick cage capstan cent centre coal measures coal-dust Coal-field colliery compressed conductors cubic foot cylinder Davy lamp depth detonator dirt distance drill driven drum electric engine fire-damp flame flange foot foot-pounds friction fulminate of mercury furnace gauze ground gunpowder haulage heat hole hoppet inches in diameter incline iron ironstone lamp length lifted load lower machine Millstone Grit mineral mines minute outcrop pass Permian pillars pipe piston pit-bottom plate props pulley pump road rocks rods roof rope rule safety-lamp sandstone screw seam of coal shaft shale shown in Fig shows side sinking sometimes speed spur-gearing square inch stalls steam steel stone strata stroke surface temperature thick timber tons tubbing tube upcast valves vein velocity vertical waggons Warwickshire water-gauge wedge weight wheel wire yards
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