Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница 7
... turned into coal ; and animal remains , such as shells , are found , also bones and bony skin , though fossilized , that is , changed , except in the most recent deposits , by chemical reactions into stone . In many cases limestone ...
... turned into coal ; and animal remains , such as shells , are found , also bones and bony skin , though fossilized , that is , changed , except in the most recent deposits , by chemical reactions into stone . In many cases limestone ...
Страница 8
... turned upside down . The following is a list of the rocks found in Great Britain , arranged in order of date and superposition , the most recent and the uppermost being at the top of the column , and the earliest and deepest being at ...
... turned upside down . The following is a list of the rocks found in Great Britain , arranged in order of date and superposition , the most recent and the uppermost being at the top of the column , and the earliest and deepest being at ...
Страница 56
... turning it round between each blow ; they also put some water in the hole to facilitate the cutting . When they have bored the hole about a half - yard they put on the cross- head , by means of which they can more easily lift and turn ...
... turning it round between each blow ; they also put some water in the hole to facilitate the cutting . When they have bored the hole about a half - yard they put on the cross- head , by means of which they can more easily lift and turn ...
Страница 57
... turning the cross - head between each blow , so that with every eight blows they make the chisel turn completely ... turned round so as to screw into the sludge ; it is also lifted up and down so as to force the semi - liquid sludge ...
... turning the cross - head between each blow , so that with every eight blows they make the chisel turn completely ... turned round so as to screw into the sludge ; it is also lifted up and down so as to force the semi - liquid sludge ...
Страница 59
... turned since it was detached from the solid ground , then , if there are any lines of bedding in the sample , they may be noted , both as to direction and angle . But to avoid any error resulting from the turning of the core during ...
... turned since it was detached from the solid ground , then , if there are any lines of bedding in the sample , they may be noted , both as to direction and angle . But to avoid any error resulting from the turning of the core during ...
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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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