Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница xxv
... Lower carboniferous rocks ( Millstone Grits , Yoredale rocks , Carboniferous limestone series , etc. ) . 3. Coal measures , including the Ganister beds . 4. Secondary rocks ( Cretaceous , Wealden series , Oolite , Lias , Keuper , Bunter ...
... Lower carboniferous rocks ( Millstone Grits , Yoredale rocks , Carboniferous limestone series , etc. ) . 3. Coal measures , including the Ganister beds . 4. Secondary rocks ( Cretaceous , Wealden series , Oolite , Lias , Keuper , Bunter ...
Страница xxvi
... lower carboniferous rocks ( carboniferous limestone ) . It seems probable , therefore , that at one time it was covered with coal measures , which have been removed by denudation . The following is a list of the chief coal - fields in ...
... lower carboniferous rocks ( carboniferous limestone ) . It seems probable , therefore , that at one time it was covered with coal measures , which have been removed by denudation . The following is a list of the chief coal - fields in ...
Страница xxvii
... Lower Carboniferous rocks , but on the east the coal measures extend under the Permian and New Red formations . On the Flintshire coast the coal measures dip under the estuary of the Dee , and extend INTRODUCTORY CHAPTER . xxvii.
... Lower Carboniferous rocks , but on the east the coal measures extend under the Permian and New Red formations . On the Flintshire coast the coal measures dip under the estuary of the Dee , and extend INTRODUCTORY CHAPTER . xxvii.
Страница xxviii
... Lower Carboniferous rocks , but the coal measures extend to the west and south under Permian rocks . A great thickness of coal measures have been proved with valuable seams of clay and ironstone . In some portions of the coal - field ...
... Lower Carboniferous rocks , but the coal measures extend to the west and south under Permian rocks . A great thickness of coal measures have been proved with valuable seams of clay and ironstone . In some portions of the coal - field ...
Страница xxix
... lower coal measures is virgin ground , which may ultimately be reached by sinking through the Pennant rocks . The upper division of coal measures is largely worked . The number of mines , including an outlying coal - field at Nailsea ...
... lower coal measures is virgin ground , which may ultimately be reached by sinking through the Pennant rocks . The upper division of coal measures is largely worked . The number of mines , including an outlying coal - field at Nailsea ...
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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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