A Text-book of Coal-mining: For the Use of Colliery Managers and OthersCharles Griffin & Company, 1904 - 563 Seiten |
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Ergebnisse 1-5 von 99
Seite 2
... less than the thickness of the bed , and is wider , the smaller the angle of inclination . In order to define a bed , two things must be known - first , the direction in which the inclined bed reaches the surface , and the inclination ...
... less than the thickness of the bed , and is wider , the smaller the angle of inclination . In order to define a bed , two things must be known - first , the direction in which the inclined bed reaches the surface , and the inclination ...
Seite 6
... less smoky flame , and are largely used for household purposes . As the proportion of oxygen decreases , the coal gets blacker and less sonorous , and the friability increases . The bituminous class of coals may be further subdivided ...
... less smoky flame , and are largely used for household purposes . As the proportion of oxygen decreases , the coal gets blacker and less sonorous , and the friability increases . The bituminous class of coals may be further subdivided ...
Seite 9
... less price than another , but if the lower - priced coal has less calorific power than the other one , the consumer may not be obtaining the best value for his money . Coals rich in oxygen never have such high calorific powers as those ...
... less price than another , but if the lower - priced coal has less calorific power than the other one , the consumer may not be obtaining the best value for his money . Coals rich in oxygen never have such high calorific powers as those ...
Seite 31
... less in diameter than the inside of the tube . It is lowered down on the rods , and a few handfuls of sand or gravel thrown on the top . This causes it to bite , when the tubes can be lifted out . Fig . 35 . Fig . 36 . Fig 37 . Fig . 38 ...
... less in diameter than the inside of the tube . It is lowered down on the rods , and a few handfuls of sand or gravel thrown on the top . This causes it to bite , when the tubes can be lifted out . Fig . 35 . Fig . 36 . Fig 37 . Fig . 38 ...
Seite 33
... less in mines at work than in purely prospective operations , as all costs of superintendence , & c . , are averaged down in the former case . Mr. H. M. Chance * states that the average cost of drilling a well by the American rope ...
... less in mines at work than in purely prospective operations , as all costs of superintendence , & c . , are averaged down in the former case . Mr. H. M. Chance * states that the average cost of drilling a well by the American rope ...
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alternating current amount angle Anthracite apparatus arrangement attached bars bolts boring bottom brake cage carbon carbonic acid carried cent centre chain coal coal-dust coils Colliery compressed connected consists cost cylinder depth distance drill driven drum employed engine explosion feet fire-damp fixed flange friction gear groove haulage hole inclined Inst iron lamp latter length lever lifted load longwall lower Lye Cross machine method mines motor obtained ordinary passes pieces pillars pipes piston placed plate plunger position pressure prevent props pulley pump quantity rails revolutions per minute roads rods roof rope round safety lamp screen screw seams Série shaft shown in Fig side sliding South Wales speed stall steam steel stroke surface timber tippler tool tube valve velocity ventilation vertical water gauge weight wheel winding winding engine wire yards