Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница xi
... shale . 25 , 26. Magnified sections of coal - plant , lepidodendron 27. Section across Midland Coal - field 28. Vertical section of Derbyshire Coal - field between Chester- field and Nottingham 29. Vein in fault • 30. Fault in coal ...
... shale . 25 , 26. Magnified sections of coal - plant , lepidodendron 27. Section across Midland Coal - field 28. Vertical section of Derbyshire Coal - field between Chester- field and Nottingham 29. Vein in fault • 30. Fault in coal ...
Страница xxvi
... shale . In Nottinghamshire considerable developments have taken place in a line from Worksop through Mansfield to Nottingham , the most easterly pits being Manton , Shireoaks , Creswell , Warsop , Sherwood , Bolsover new sinking , and ...
... shale . In Nottinghamshire considerable developments have taken place in a line from Worksop through Mansfield to Nottingham , the most easterly pits being Manton , Shireoaks , Creswell , Warsop , Sherwood , Bolsover new sinking , and ...
Страница xxix
... shales . There are large areas of the Lower Series yet to be proved . The number of collieries in Scotland is about 460 , the deepest shaft being 550 yards.1 1 Presidential address by I. S. Dixon , " Trans . I.M.E. , " vol . xxiii . , p ...
... shales . There are large areas of the Lower Series yet to be proved . The number of collieries in Scotland is about 460 , the deepest shaft being 550 yards.1 1 Presidential address by I. S. Dixon , " Trans . I.M.E. , " vol . xxiii . , p ...
Страница xxxiii
... shale , which contains copper and a small percentage of silver , but , nevertheless , it is a 4 - inch seam . At the time when the author visited the mines they were working hundreds of acres a year , at a depth of 1200 feet , and the ...
... shale , which contains copper and a small percentage of silver , but , nevertheless , it is a 4 - inch seam . At the time when the author visited the mines they were working hundreds of acres a year , at a depth of 1200 feet , and the ...
Страница xlii
... shales and asphalts which will burn , and which , no doubt , will be used when better fuel is scarce ; but these are not of great importance , and therefore will not materially prolong the duration of the coal- consuming period . Tides ...
... shales and asphalts which will burn , and which , no doubt , will be used when better fuel is scarce ; but these are not of great importance , and therefore will not materially prolong the duration of the coal- consuming period . Tides ...
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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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