Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница xxvii
... carried in advance so as to prove any faults . The number of collieries in the Northern Coal - field is 440 . 3. The South Wales Coal - field is fully proved and developed , the coal measures outcropping round the whole field . Owing to ...
... carried in advance so as to prove any faults . The number of collieries in the Northern Coal - field is 440 . 3. The South Wales Coal - field is fully proved and developed , the coal measures outcropping round the whole field . Owing to ...
Страница xl
... carried , and in some cases the freight is worth as much as the coal , so that twice the price of the fuel is saved . This great economy justifies a corre- spondingly large outlay in the purchase of new machinery of the best kind . It ...
... carried , and in some cases the freight is worth as much as the coal , so that twice the price of the fuel is saved . This great economy justifies a corre- spondingly large outlay in the purchase of new machinery of the best kind . It ...
Страница 5
... carried by the streams into lakes and seas , and be there deposited in beds which would gradually reach a thickness of thousands of feet , and consoli- b Z date into sand- stone , shale , etc. ( see Fig . 5 ) , with which might FIG . 5 ...
... carried by the streams into lakes and seas , and be there deposited in beds which would gradually reach a thickness of thousands of feet , and consoli- b Z date into sand- stone , shale , etc. ( see Fig . 5 ) , with which might FIG . 5 ...
Страница 6
... carried down to the sea by the rivers and formed again into newer sedi- mentary rocks ( see Fig . 6 ) . These processes were re- b b C FIG . 6 - Older stratified rocks and new stratified rocks . a , old stratified rocks ; b , surface of ...
... carried down to the sea by the rivers and formed again into newer sedi- mentary rocks ( see Fig . 6 ) . These processes were re- b b C FIG . 6 - Older stratified rocks and new stratified rocks . a , old stratified rocks ; b , surface of ...
Страница 7
... carried a long way by the wind ; the dust , falling to the ground , becomes consolidated into rock ( called tuff ) . There are evi- dences of volcanic agency from the earliest known geo- logical periods down to the present time . In the ...
... carried a long way by the wind ; the dust , falling to the ground , becomes consolidated into rock ( called tuff ) . There are evi- dences of volcanic agency from the earliest known geo- logical periods down to the present time . In the ...
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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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