A Text-book of Coal-mining: For the Use of Colliery Managers and Others |
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Inhalt
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A Text-Book of Coal Mining for the Use of Colliery Managers and Others ... Herbert W Hughes,Limited Charles Griffin and Company Keine Leseprobe verfügbar - 2015 |
Häufige Begriffe und Wortgruppen
action advantage allow amount arrangement attached bars boring bottom cage carried cause cent centre closed coal Colliery connected considerable consists construction contain cost cylinder designed diameter direction distance drill driving drum effect electric employed engine equal explosion face feet fixed force give given guides hole inches inclined increased Inst iron lamp latter length less lever lifted load lower machine material means method mines motor moved necessary obtained operation ordinary passes pieces pipes piston placed plate position practice pressure prevent produced pulley pump quantity reached reduced removed roads rock rods rope round screen screw seams shaft shown side speed steam stop stroke surface taken takes tool tube tubs turned valve weight wheel winding wire yards