Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница vii
... BARS AND PROPS XVI . UNDERGROUND HAULAGE : JIGS , SINGLE ROPE , TAIL ROPE , ENDLESS ROPE , CHAIN , LOCOMOTIVES , COMPRESSED AIR , ELECTRIC , ROPEWAYS ON SURFACE 321 335 XVII . XVIII , TRANSMISSION OF POWER : RODS , ROPES , AIR , WATER ...
... BARS AND PROPS XVI . UNDERGROUND HAULAGE : JIGS , SINGLE ROPE , TAIL ROPE , ENDLESS ROPE , CHAIN , LOCOMOTIVES , COMPRESSED AIR , ELECTRIC , ROPEWAYS ON SURFACE 321 335 XVII . XVIII , TRANSMISSION OF POWER : RODS , ROPES , AIR , WATER ...
Страница ix
... Bars : Yorkshire College Tests XV . Strength of Steel Bars 329 330 XVI . Strength of Wooden Props : Yorkshire College Tests 332 XVII . XVIII . Ratio of Length and Diameter of Props and Crushing Load . 333 Strength of Steel Props 534 XIX ...
... Bars : Yorkshire College Tests XV . Strength of Steel Bars 329 330 XVI . Strength of Wooden Props : Yorkshire College Tests 332 XVII . XVIII . Ratio of Length and Diameter of Props and Crushing Load . 333 Strength of Steel Props 534 XIX ...
Страница xx
... bars , round 321 416. Props and bars , half - round 321 417. Props and bars , steel 322 420. Props in heading 422 . 418. Props and bars , notched . 419. Props and bars , spiked 421. Bars in heading Sections of timbered heading 423 ...
... bars , round 321 416. Props and bars , half - round 321 417. Props and bars , steel 322 420. Props in heading 422 . 418. Props and bars , notched . 419. Props and bars , spiked 421. Bars in heading Sections of timbered heading 423 ...
Страница 55
... bars . If the hole is probably to be from 20 to 50 yards , it is started more carefully . It is a common practice to dig a pit 6 or 7 feet in diameter and about 7 feet deep . The digging of this pit serves several purposes . In the ...
... bars . If the hole is probably to be from 20 to 50 yards , it is started more carefully . It is a common practice to dig a pit 6 or 7 feet in diameter and about 7 feet deep . The digging of this pit serves several purposes . In the ...
Страница 67
... bar ; b , auger stem ; d , rope socket ; e , ring socket ; f , club bit ; f ' , edge view same ; g , reamer ; g ' , bottom view same ; h , centre bit ; h ' , side view same ; i , reamer ; 7 ' , bottom view same ; m , winch . order ...
... bar ; b , auger stem ; d , rope socket ; e , ring socket ; f , club bit ; f ' , edge view same ; g , reamer ; g ' , bottom view same ; h , centre bit ; h ' , side view same ; i , reamer ; 7 ' , bottom view same ; m , winch . order ...
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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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