Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница xviii
... foot road and 15 × 5 road 234 234 237 242 328. Air - roads of uniform and of uneven section 249 329. Splitting in four air - currents 251 330. Inclined air - roads . 253 331. Compressed air - jet in pipes 254 CHEMISTRY OF MINES . 332 ...
... foot road and 15 × 5 road 234 234 237 242 328. Air - roads of uniform and of uneven section 249 329. Splitting in four air - currents 251 330. Inclined air - roads . 253 331. Compressed air - jet in pipes 254 CHEMISTRY OF MINES . 332 ...
Страница xxxi
... foot in thickness . It also decided to make large deductions from the amount of coal supposed to be in the ground on account of faults , barriers , and waste in working , the amount of such deductions varying from about 25 per cent . to ...
... foot in thickness . It also decided to make large deductions from the amount of coal supposed to be in the ground on account of faults , barriers , and waste in working , the amount of such deductions varying from about 25 per cent . to ...
Страница xxxii
... foot in thickness have been exhausted . It seems that the difficulty of getting a thin seam , the same as the difficulty of working a hot mine , or a mine where the pressure is very great , can be entirely overcome if only a sufficient ...
... foot in thickness have been exhausted . It seems that the difficulty of getting a thin seam , the same as the difficulty of working a hot mine , or a mine where the pressure is very great , can be entirely overcome if only a sufficient ...
Страница xxxiv
... foot of coal met with in the seams of 1 foot and upwards in thickness there will be between 1 and 2 inches of coal met with in seams under 12 inches in thickness ; or , in other words , that the thin coal will be not less than 10 per ...
... foot of coal met with in the seams of 1 foot and upwards in thickness there will be between 1 and 2 inches of coal met with in seams under 12 inches in thickness ; or , in other words , that the thin coal will be not less than 10 per ...
Страница xxxv
... foot thick ... ... Coal - fields of Dover and possible South of England Possible coal - field of Lincolnshire Total ... 97,426 29,227 17,536 20,000 359,040 Warwickshire Leicestershire COAL COMMISSION . SUB - PERMIAN : PROVED AND ...
... foot thick ... ... Coal - fields of Dover and possible South of England Possible coal - field of Lincolnshire Total ... 97,426 29,227 17,536 20,000 359,040 Warwickshire Leicestershire COAL COMMISSION . SUB - PERMIAN : PROVED AND ...
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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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