Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Резултати 1 - 5 от 62.
Страница xxii
... piston - rod . 393 501. Horizontal coupled engines : cranks at right angles 394 502 , 503. Coupled engines : inverted ( Harris ) . 395 504 , 505. Coupled engines : horizontal ( Denaby ) 396 506. Balanced slide - valve 399 507 ...
... piston - rod . 393 501. Horizontal coupled engines : cranks at right angles 394 502 , 503. Coupled engines : inverted ( Harris ) . 395 504 , 505. Coupled engines : horizontal ( Denaby ) 396 506. Balanced slide - valve 399 507 ...
Страница 62
... piston rather smaller than the bore - hole , which is free to slide a short distance on the bore - rod B ; W is a wedge attached to the piston by the thin rods S. Two holes are bored in the wedge at an angle of 40 ° from the vertical ...
... piston rather smaller than the bore - hole , which is free to slide a short distance on the bore - rod B ; W is a wedge attached to the piston by the thin rods S. Two holes are bored in the wedge at an angle of 40 ° from the vertical ...
Страница 64
... piston , P , near the top ; which works in a cylinder , A. The cylinder is suspended from the upper rods U by the fork F. Suppose the rods suspended in the hole with the chisel say 3 feet from the bottom , the weight of the lower rods ...
... piston , P , near the top ; which works in a cylinder , A. The cylinder is suspended from the upper rods U by the fork F. Suppose the rods suspended in the hole with the chisel say 3 feet from the bottom , the weight of the lower rods ...
Страница 69
... tight ; steam is then turned into the boring - cylinder , which raises the piston - rod , carry . ing above it the pulley G. It is evident that BORING HAND , STEAM , RODS , ROPES , ETC. 69 Mather and Platt: engines and frame 100.
... tight ; steam is then turned into the boring - cylinder , which raises the piston - rod , carry . ing above it the pulley G. It is evident that BORING HAND , STEAM , RODS , ROPES , ETC. 69 Mather and Platt: engines and frame 100.
Страница 70
... piston , which then drops , and the tool , which falls twice as fast as the piston , strikes a smart blow at the bottom of the hole , the hard- ness of the blow being regulated by the height to which the tool is lifted , the engine ...
... piston , which then drops , and the tool , which falls twice as fast as the piston , strikes a smart blow at the bottom of the hole , the hard- ness of the blow being regulated by the height to which the tool is lifted , the engine ...
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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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