Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
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Страница vi
... given is not as full and complete as he would like , let him reflect that any one of fifteen out of the twenty - four subjects to which a chapter is given in these pages would require for its complete and masterly treat- ment a book as ...
... given is not as full and complete as he would like , let him reflect that any one of fifteen out of the twenty - four subjects to which a chapter is given in these pages would require for its complete and masterly treat- ment a book as ...
Страница xxxiv
... given by the Commissioners , would be increased by 50 per cent . Then as to the thin coals . It is very difficult to estimate the amount of those , and , indeed , the estimate can only be in the nature of a probable guess ; but it is ...
... given by the Commissioners , would be increased by 50 per cent . Then as to the thin coals . It is very difficult to estimate the amount of those , and , indeed , the estimate can only be in the nature of a probable guess ; but it is ...
Страница xxxv
... GIVEN . 50 per cent . for reduced waste in working JO " " for coals under I foot thick ... ... Coal - fields of Dover and possible South of England Possible coal - field of Lincolnshire Total ... 97,426 29,227 17,536 20,000 359,040 ...
... GIVEN . 50 per cent . for reduced waste in working JO " " for coals under I foot thick ... ... Coal - fields of Dover and possible South of England Possible coal - field of Lincolnshire Total ... 97,426 29,227 17,536 20,000 359,040 ...
Страница xli
... given very close attention to the subject , that some sub- stitute will be found for coal - some new substance or some new force discovered that will do the work that is at present done by coal . The matter has been very carefully ...
... given very close attention to the subject , that some sub- stitute will be found for coal - some new substance or some new force discovered that will do the work that is at present done by coal . The matter has been very carefully ...
Страница 19
... given below and in the following pages occur in a great variety of forms and chemical combina- tions , to each of which mineralogists have given a name . There are many hundreds of these , for the study of which the reader is referred ...
... given below and in the following pages occur in a great variety of forms and chemical combina- tions , to each of which mineralogists have given a name . There are many hundreds of these , for the study of which the reader is referred ...
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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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