Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница 8
... rule is invariable , although , in cases where there have been great disturb- ances , some portions of the strata have been turned upside down . The following is a list of the rocks found in Great Britain , arranged in order of date and ...
... rule is invariable , although , in cases where there have been great disturb- ances , some portions of the strata have been turned upside down . The following is a list of the rocks found in Great Britain , arranged in order of date and ...
Страница 25
... rule , a bed of fire - clay has a seam of coal overlying it , but the coal may be very thin and of no present commercial value , or may be represented by a carbonaceous shale . Fire - clay is like ordinary surface clay in this respect ...
... rule , a bed of fire - clay has a seam of coal overlying it , but the coal may be very thin and of no present commercial value , or may be represented by a carbonaceous shale . Fire - clay is like ordinary surface clay in this respect ...
Страница 26
... rule stone is got by open work . FIG . 36. - Section showing deposit of hæma- a , hæmatite ; b , carboniferous tite ore . limestone . A great deal of stone is un- stratified rock of the class commonly called igneous , such as granite ...
... rule stone is got by open work . FIG . 36. - Section showing deposit of hæma- a , hæmatite ; b , carboniferous tite ore . limestone . A great deal of stone is un- stratified rock of the class commonly called igneous , such as granite ...
Страница 39
... rule , a geological horizontal section is either sketched to no scale at all or is drawn to a " distorted " scale . SHALE . 116 ' 6 " Rock . 48'0 " 1 / 4'0 " SHALE . FIG . 52. - Section of bore - hole . Scale 100 feet to 1 inch . The ...
... rule , a geological horizontal section is either sketched to no scale at all or is drawn to a " distorted " scale . SHALE . 116 ' 6 " Rock . 48'0 " 1 / 4'0 " SHALE . FIG . 52. - Section of bore - hole . Scale 100 feet to 1 inch . The ...
Страница 43
... rule , and even at the present day the preliminary operation of searching for minerals would be rendered too costly if pumping plant had to be erected before it was known that there was any large quantity of mineral to get . Another ...
... rule , and even at the present day the preliminary operation of searching for minerals would be rendered too costly if pumping plant had to be erected before it was known that there was any large quantity of mineral to get . Another ...
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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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