Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница xxvi
... present time is 684 , and the persons employed number nearly one - quarter of the total coal - mining population of the United Kingdom . 2. The Northern Coal - field includes the counties of North- umberland and Durham . It extends from ...
... present time is 684 , and the persons employed number nearly one - quarter of the total coal - mining population of the United Kingdom . 2. The Northern Coal - field includes the counties of North- umberland and Durham . It extends from ...
Страница xxxii
... present time the working of seams only 20 inches in thick- ness is quite common in this country , and occasionally seams only 12 inches in thickness are worked . In the neighbour- hood of Leeds a seam of coal has been largely worked in ...
... present time the working of seams only 20 inches in thick- ness is quite common in this country , and occasionally seams only 12 inches in thickness are worked . In the neighbour- hood of Leeds a seam of coal has been largely worked in ...
Страница xxxvii
... present rate of production our coal will last us for 1500 years . But it is not probable that we have yet reached our maximum output . If our production is increased 50 per cent . our coal would last over 1000 years . If our production ...
... present rate of production our coal will last us for 1500 years . But it is not probable that we have yet reached our maximum output . If our production is increased 50 per cent . our coal would last over 1000 years . If our production ...
Страница xxxviii
... present time American coal exporters are considering the Mediterranean as one of their future markets , and if the price of English coal were maintained at the price of 1900 there is little doubt but that American coal would largely ...
... present time American coal exporters are considering the Mediterranean as one of their future markets , and if the price of English coal were maintained at the price of 1900 there is little doubt but that American coal would largely ...
Страница xxxix
... Present population probable . Area of land . Sq . miles . Sq . miles . North America United Kingdom , say Rest of Europe " " " " 9,000 42,000,000 20,000 318,000,000 121,000 3,379,000 250,000 100,000,000 8,400,000 South " " a guess ...
... Present population probable . Area of land . Sq . miles . Sq . miles . North America United Kingdom , say Rest of Europe " " " " 9,000 42,000,000 20,000 318,000,000 121,000 3,379,000 250,000 100,000,000 8,400,000 South " " a guess ...
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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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