Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница xiii
... lifting - clamp 79 118. Diamond boring : bayonet clutch coupling 119. Diamond boring : core - lifter 79 79 WINNING . 120-124 . Methods of winning coal 125. Metalliferous veins . 82-84 85 125a . Proposed water - level for the Forest of ...
... lifting - clamp 79 118. Diamond boring : bayonet clutch coupling 119. Diamond boring : core - lifter 79 79 WINNING . 120-124 . Methods of winning coal 125. Metalliferous veins . 82-84 85 125a . Proposed water - level for the Forest of ...
Страница 6
... lifted up above the sea - level , and the dry land lowered beneath it ; then the new rocks would be attacked by the weather and carried down to the sea by the rivers and formed again into newer sedi- mentary rocks ( see Fig . 6 ) ...
... lifted up above the sea - level , and the dry land lowered beneath it ; then the new rocks would be attacked by the weather and carried down to the sea by the rivers and formed again into newer sedi- mentary rocks ( see Fig . 6 ) ...
Страница 54
... shoulders the rod can be lifted or suspended . 1 These flush - jointed tubes are the same diameter inside and outside through the whole length of tubing . The set of boring - rods consists of one chisel MINING . Hand-boring tools BORING.
... shoulders the rod can be lifted or suspended . 1 These flush - jointed tubes are the same diameter inside and outside through the whole length of tubing . The set of boring - rods consists of one chisel MINING . Hand-boring tools BORING.
Страница 57
... lifted , then unhooked from the spring - pole , and lowered an inch or two on to a fork ( Fig . 75 , 13 ) placed over the hole , which supports the rods by the lower shoulder . Then the cross- head is unscrewed by the key ( Fig . 75 ...
... lifted , then unhooked from the spring - pole , and lowered an inch or two on to a fork ( Fig . 75 , 13 ) placed over the hole , which supports the rods by the lower shoulder . Then the cross- head is unscrewed by the key ( Fig . 75 ...
Страница 59
... lifted alternately so as to cause the points of the four steel cutters to enter into the lower part of the core c . The iron ring d is lowered down inside the cylinder a , and over the core and on to the top of the four steel cutters ...
... lifted alternately so as to cause the points of the four steel cutters to enter into the lower part of the core c . The iron ring d is lowered down inside the cylinder a , and over the core and on to the top of the four steel cutters ...
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Често срещани думи и фрази
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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