A Text-book of Coal-mining: For the Use of Colliery Managers and OthersCharles Griffin & Company, 1904 - 563 Seiten |
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Seite 2
... taken to distinguish between the true and apparent inclination ; the latter can never be greater than the former , but it may be less to any amount . When the strata are bent in arches they are said to have a synclinal fold , when the ...
... taken to distinguish between the true and apparent inclination ; the latter can never be greater than the former , but it may be less to any amount . When the strata are bent in arches they are said to have a synclinal fold , when the ...
Seite 5
... taken place , as would be necessary to account for the alternate layers of thin coal and shale so often found in coal seams . Exposed to the action of the atmosphere , vegetation decays and goes to enrich the soil , but supposing that ...
... taken place , as would be necessary to account for the alternate layers of thin coal and shale so often found in coal seams . Exposed to the action of the atmosphere , vegetation decays and goes to enrich the soil , but supposing that ...
Seite 21
... taken out for sharpening . Two guides are employed to keep the tool perpendicular ; one , c , being a plain cylinder , the other , d , having ribs of saw - tooth form arranged round its circumference . These ribs have a long pitch , and ...
... taken out for sharpening . Two guides are employed to keep the tool perpendicular ; one , c , being a plain cylinder , the other , d , having ribs of saw - tooth form arranged round its circumference . These ribs have a long pitch , and ...
Seite 23
... taken round one of the drum shafts . The engine is started , and one of the drillers takes his stand near the drum with the loose end of the cable in his hands . A slight pull on this tightens the loose coils on the drum shaft , which ...
... taken round one of the drum shafts . The engine is started , and one of the drillers takes his stand near the drum with the loose end of the cable in his hands . A slight pull on this tightens the loose coils on the drum shaft , which ...
Seite 29
... taken place some distance above a joint , when the rods were raised the top part would catch the side of the bore - hole , as the crow's foot itself only grips at a joint . In such cases an instrument called a " bell " is let down . In ...
... taken place some distance above a joint , when the rods were raised the top part would catch the side of the bore - hole , as the crow's foot itself only grips at a joint . In such cases an instrument called a " bell " is let down . In ...
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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