Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница ix
... Friction 81 138 204 IX . Fuel required for Furnace XII . Light of Safety - lamps compared with that of Candles XIII . Weight of Safety - lamps without Oil and Wick XIV . Strength of Wooden Bars : Yorkshire College Tests XV . Strength of ...
... Friction 81 138 204 IX . Fuel required for Furnace XII . Light of Safety - lamps compared with that of Candles XIII . Weight of Safety - lamps without Oil and Wick XIV . Strength of Wooden Bars : Yorkshire College Tests XV . Strength of ...
Страница xxi
... Friction of air in pipes 484. Immisch dynamo 485. Electric conductors and coverings 486. Davis and Stokes's safety commutator 487. Laufen - Frankfort experimental plant 366 366 • 367 368 370 374 378 378 380 381 FIGURE PAGE 488. Three ...
... Friction of air in pipes 484. Immisch dynamo 485. Electric conductors and coverings 486. Davis and Stokes's safety commutator 487. Laufen - Frankfort experimental plant 366 366 • 367 368 370 374 378 378 380 381 FIGURE PAGE 488. Three ...
Страница 77
... friction ; this weight is reduced by balance - weights . Wire ropes or chains from the balance - weights pass over pulleys R , and are connected with a loose collar , H , fixed on the gripping - tube , within which it is free to revolve ...
... friction ; this weight is reduced by balance - weights . Wire ropes or chains from the balance - weights pass over pulleys R , and are connected with a loose collar , H , fixed on the gripping - tube , within which it is free to revolve ...
Страница 93
... 1 Leyden jars charged by friction machines may also be used for shot- firing . The high tension of this current enables it to be passed great distances through thin wires . connected with each shot ; these fuses are made to SINKING . 93.
... 1 Leyden jars charged by friction machines may also be used for shot- firing . The high tension of this current enables it to be passed great distances through thin wires . connected with each shot ; these fuses are made to SINKING . 93.
Страница 205
... friction against the shaft- sides . ) Fig . 295 shows an upcast shaft 500 feet deep , and a downcast shaft 1000 feet deep , the bottom of each shaft being on the same level . In this case there is a height of 500 feet of fresh air above ...
... friction against the shaft- sides . ) Fig . 295 shows an upcast shaft 500 feet deep , and a downcast shaft 1000 feet deep , the bottom of each shaft being on the same level . In this case there is a height of 500 feet of fresh air above ...
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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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