Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница xvii
... temperature 198 288. Air - currents in shallow pits , summer and winter 199 289. Fire - lamp in shaft 200 290. Furnace and dumb - driít 200 291. Single furnace in pit 200 292. Double furnace in pit 201 293. Range of four furnaces in pit ...
... temperature 198 288. Air - currents in shallow pits , summer and winter 199 289. Fire - lamp in shaft 200 290. Furnace and dumb - driít 200 291. Single furnace in pit 200 292. Double furnace in pit 201 293. Range of four furnaces in pit ...
Страница xxxi
... Temperature of Mines . - The probable heat of mines may be estimated by the following calculation : Taking the ... temperature , or a total temperature of 100 degrees . At a depth of 4000 feet the increase in temperature would be 66 ...
... Temperature of Mines . - The probable heat of mines may be estimated by the following calculation : Taking the ... temperature , or a total temperature of 100 degrees . At a depth of 4000 feet the increase in temperature would be 66 ...
Страница xxxii
An Elementary Treatise on the Getting of Minerals Arnold Lupton. 10,000 feet the increased temperature would be 166 degrees , and the total temperature 216 degrees , or , say , the temperature of boiling water . It is not likely that ...
An Elementary Treatise on the Getting of Minerals Arnold Lupton. 10,000 feet the increased temperature would be 166 degrees , and the total temperature 216 degrees , or , say , the temperature of boiling water . It is not likely that ...
Страница 4
... temperature of the earth is greater inside than the average surface temperature . At a depth of 50 feet in England the temperature of the earth is 50 ° Fahr . , and 60 feet deeper it is 51 ° , and so on . For every increase of 60 feet ...
... temperature of the earth is greater inside than the average surface temperature . At a depth of 50 feet in England the temperature of the earth is 50 ° Fahr . , and 60 feet deeper it is 51 ° , and so on . For every increase of 60 feet ...
Страница 5
... temperature or chemical constitu- tion . When first the seas were condensed upon the surface of the earth , they may have been boiling hot , and have contained minerals in solution subsequently deposited in rock formations . It is also ...
... temperature or chemical constitu- tion . When first the seas were condensed upon the surface of the earth , they may have been boiling hot , and have contained minerals in solution subsequently deposited in rock formations . It is also ...
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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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