Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница xiv
... wedges , and tools 124 180. Cast - iron tubbing - plate , design B 126 181. Cast - iron tubbing , internal flanges , faced and bolted 182. Cast - iron wall - box 128 129 183. Brick - and - cement coffering 130 FIGURE PAGE 184 , 185 ...
... wedges , and tools 124 180. Cast - iron tubbing - plate , design B 126 181. Cast - iron tubbing , internal flanges , faced and bolted 182. Cast - iron wall - box 128 129 183. Brick - and - cement coffering 130 FIGURE PAGE 184 , 185 ...
Страница xix
... Wedge 377. Breaking down coal by hand - wedges in a row 378. Multiple wedge and feather ( Elliot's ) 379. Grafton Jones wedge 380-386 . Grafton Jones wedge : details . 387 , 388. Grafton Jones wedge : application 389. Drilling - machine ...
... Wedge 377. Breaking down coal by hand - wedges in a row 378. Multiple wedge and feather ( Elliot's ) 379. Grafton Jones wedge 380-386 . Grafton Jones wedge : details . 387 , 388. Grafton Jones wedge : application 389. Drilling - machine ...
Страница xxi
... wedge - clips 352 461. Endless rope : Barraclough's clip 460. Endless rope : Fowler's clip pulley . 352 352 462. Endless rope : grip pulley 353 463. Endless rope : three - groove and two - groove wheels 464. Endless rope : tightening ...
... wedge - clips 352 461. Endless rope : Barraclough's clip 460. Endless rope : Fowler's clip pulley . 352 352 462. Endless rope : grip pulley 353 463. Endless rope : three - groove and two - groove wheels 464. Endless rope : tightening ...
Страница xxii
... wedge - shape slides to lift 400 • 402 404 405 405 405 514. Flat - rope drum ( aloe fibre ) 406 515. Automatic steam - brake ( Reumaux ) . 407 516-521 . Indicator diagrams 409 522. Velocimeter 411 523. Explanatory diagram ( Denaby ) 524 ...
... wedge - shape slides to lift 400 • 402 404 405 405 405 514. Flat - rope drum ( aloe fibre ) 406 515. Automatic steam - brake ( Reumaux ) . 407 516-521 . Indicator diagrams 409 522. Velocimeter 411 523. Explanatory diagram ( Denaby ) 524 ...
Страница 58
... wedge b jams one side of the bell against the core , thus breaking it off ; the springs help to hold the core in the bell whilst it is being drawn up . Another core- extractor is shown in Fig . 76. The cylinder a a is lowered 2800 CORE ...
... wedge b jams one side of the bell against the core , thus breaking it off ; the springs help to hold the core in the bell whilst it is being drawn up . Another core- extractor is shown in Fig . 76. The cylinder a a is lowered 2800 CORE ...
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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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