Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green & Company, 1893 - 519 страници |
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Страница 88
... the pit , and all the workmen go FIG . 128. -Shot - hole . 1 , clay cover to pro- tect flame ; 2 , candle , in clay , firing fuse ; in tarred bag ; 5 , 3. fuse ; 4 , powder tamping . The out but one or two . A signal is 88 MINING .
... the pit , and all the workmen go FIG . 128. -Shot - hole . 1 , clay cover to pro- tect flame ; 2 , candle , in clay , firing fuse ; in tarred bag ; 5 , 3. fuse ; 4 , powder tamping . The out but one or two . A signal is 88 MINING .
Страница 89
... flame or spark ; it is necessary to employ an explosive cap to light the dynamite . This is a copper cap with fulminate of mercury ; the fuse is slipped into the cap , which is squeezed tight with a pair of nippers , and some grease is ...
... flame or spark ; it is necessary to employ an explosive cap to light the dynamite . This is a copper cap with fulminate of mercury ; the fuse is slipped into the cap , which is squeezed tight with a pair of nippers , and some grease is ...
Страница 166
... flame . Spontaneous combustion has been frequently observed on board ship where coal is stowed in masses of hundreds or thousands of tons , in heaps of small coal laid down in stock at collieries , as well as in the underground workings ...
... flame . Spontaneous combustion has been frequently observed on board ship where coal is stowed in masses of hundreds or thousands of tons , in heaps of small coal laid down in stock at collieries , as well as in the underground workings ...
Страница 196
... flames may reach into the shaft ; and the smoke- drift from the furnace should enter the shaft FIG . 289. - Fire - lamp not less than 20 or 30 yards from the bottom , in order that , when men are being lowered down , they may pass the ...
... flames may reach into the shaft ; and the smoke- drift from the furnace should enter the shaft FIG . 289. - Fire - lamp not less than 20 or 30 yards from the bottom , in order that , when men are being lowered down , they may pass the ...
Страница 252
... flame is instantly extinguished . Two and a half per cent . of this gas will put out a flame ; 1 its presence can be ascertained by observing a candle or other light . In exploring wells it is common to lower a light down to see if ...
... flame is instantly extinguished . Two and a half per cent . of this gas will put out a flame ; 1 its presence can be ascertained by observing a candle or other light . In exploring wells it is common to lower a light down to see if ...
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air-current air-road anemometer angle bars beds bore-hole boring bottom brattice brick cage capstan Carboniferous centre chisel clinometer coal measures coal-dust Coal-field colliery compressed cubic cubic foot cylinder Davy lamp depth dirt distance drill driven drum electric engine explosion feet fire-damp flame flange foot friction furnace gauze ground haulage hole hoppet horizontal inches in diameter incline iron ironstone joints lamp length lifted limestone load longwall lower machine mineral mines Oolite outcrop pass pillars pipe piston pit-bottom plate plumb-bob 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 South Wales speed spur-gearing square inch Staffordshire stalls steam steel stone strata stroke surface temperature thick timber tons tubbing tube upcast valves veins velocity vertical waggons wedge weight wheel wire yards
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Страница i - City and Guilds of London Institute. With 199 Diagrams. 8vo. 12s. net. LUPTON— Mining : an Elementary Treatise on the Getting of Minerals. By ARNOLD LUPTON, MICE, FGS, &c., Mining Engineer, Certificated Colliery Manager, Surveyor, &c.
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Страница 113 - FIG. 442. work. This slide being say 18 inches long, the hole can be drilled that depth. When this depth is reached the screw is reversed, the drill drawn out of the hole, and a longer drill placed in the hole and fastened to the piston. The second drill is rather narrower than the first, so that it will not catch on the sides of the hole. When the entire length of this drill has been bored, if it is still necessary to go deeper, a third and then a fourth drill can be...
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Страница 113 - ... work. This slide being say 18 inches long, the hole can be drilled that depth. When this depth is reached the screw is reversed, the drill drawn out of the hole, and a longer drill placed in the hole and fastened to the piston. The second drill is rather narrower than the first, so that it will not catch on the sides of the hole. When the entire length of this drill has been bored, if it is still necessary to go deeper, a third and then a fourth drill can be added. Percussion drills may be used...
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