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 100
Seite vi
... space , I have had to omit reference to many appliances which have become obsolete from their antiquity , or by reason of their failure in practice . Although it is impossible within the limits of the book to furnish exhaustive ...
... space , I have had to omit reference to many appliances which have become obsolete from their antiquity , or by reason of their failure in practice . Although it is impossible within the limits of the book to furnish exhaustive ...
Seite 1
... space for a consideration of the salient points with which the mining student should be familiar . He is , therefore , referred to the standard treatises on geology . A few brief notes are here given to recall to his mind the order of ...
... space for a consideration of the salient points with which the mining student should be familiar . He is , therefore , referred to the standard treatises on geology . A few brief notes are here given to recall to his mind the order of ...
Seite 2
... space where this happens is said to be the outcrop of the bed . The nature of the outcrop and its width depend on the thickness of the bed and the degree of inclination ; it cannot be less than the thickness of the bed , and is wider ...
... space where this happens is said to be the outcrop of the bed . The nature of the outcrop and its width depend on the thickness of the bed and the degree of inclination ; it cannot be less than the thickness of the bed , and is wider ...
Seite 16
... space is filled in . This shutter really fills two purposes , as it prevents anything falling down the bore - hole , and also suspends the rods during the operation of unscrewing , the hole through it being large enough to allow the ...
... space is filled in . This shutter really fills two purposes , as it prevents anything falling down the bore - hole , and also suspends the rods during the operation of unscrewing , the hole through it being large enough to allow the ...
Seite 20
... space , leaving a central core . A second tool is then lowered down to the bottom of the hole , and a cutting tooth at the base is pressed inwards by means of a spring . This took is revolved several times , until the greater part of ...
... space , leaving a central core . A second tool is then lowered down to the bottom of the hole , and a cutting tooth at the base is pressed inwards by means of a spring . This took is revolved several times , until the greater part of ...
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Häufige Begriffe und Wortgruppen
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