Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница xxvi
... 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 same possibility of extension under the ...
... 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 same possibility of extension under the ...
Страница xxix
... varying width of about 20 miles , this area being broken up into a number of basins . The coal measures have been divided up into the Upper Series , underlying the red sand- stones , and the Lower Series , underlying the white ...
... varying width of about 20 miles , this area being broken up into a number of basins . The coal measures have been divided up into the Upper Series , underlying the red sand- stones , and the Lower Series , underlying the white ...
Страница xxxi
... varying from about 25 per cent . to 47 per cent . Criticisms of Royal Coal Commission . - Before giving the figures as ascertained by the Royal Coal Commission , it may be well to criticize them to some extent . Temperature of Mines ...
... varying from about 25 per cent . to 47 per cent . Criticisms of Royal Coal Commission . - Before giving the figures as ascertained by the Royal Coal Commission , it may be well to criticize them to some extent . Temperature of Mines ...
Страница xl
... varies with every house ; but it is probable that with the most economical arrangements reasonably practicable one ton of coal would do as much work for domestic purposes as is now done by six . The gas - engine is now competing with ...
... varies with every house ; but it is probable that with the most economical arrangements reasonably practicable one ton of coal would do as much work for domestic purposes as is now done by six . The gas - engine is now competing with ...
Страница 21
... varying proportions ( see Figs . 31 to 33 ) . Where the veins are formed in cracks caused by violent b る FIG . 32. - Silver - lead , Clausthal , Germany : from a photograph by the author . a , lead ore containing silver , as seen in a ...
... varying proportions ( see Figs . 31 to 33 ) . Where the veins are formed in cracks caused by violent b る FIG . 32. - Silver - lead , Clausthal , Germany : from a photograph by the author . a , lead ore containing silver , as seen in a ...
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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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