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 16
... length of rod inserted between it and the main length attached to the tool . This operation is repeated until sufficient distance has been bored to allow of the insertion of an ordinary length of rod , the smaller making - up pieces ...
... length of rod inserted between it and the main length attached to the tool . This operation is repeated until sufficient distance has been bored to allow of the insertion of an ordinary length of rod , the smaller making - up pieces ...
Seite 17
... length from the fixed point it rests on an upright . To the other end are fixed two cross - bars which the workmen press down on to a second spring pole , thus producing a dancing movement . Between the upright and the cross beams is ...
... length from the fixed point it rests on an upright . To the other end are fixed two cross - bars which the workmen press down on to a second spring pole , thus producing a dancing movement . Between the upright and the cross beams is ...
Seite 19
... length of upper rods follow at a slower speed . When this has descended to the proper point , a slight upward motion , producing pressure on the upper side of the leather disc , causes it to descend with the rode and collar c , and so ...
... length of upper rods follow at a slower speed . When this has descended to the proper point , a slight upward motion , producing pressure on the upper side of the leather disc , causes it to descend with the rode and collar c , and so ...
Seite 21
... length of stroke can be varied by altering the position of the tappets . Before the valves can be opened , it is ... lengths , which are connected together by loose collars and screw threads . The chief peculiarity consists in the method ...
... length of stroke can be varied by altering the position of the tappets . Before the valves can be opened , it is ... lengths , which are connected together by loose collars and screw threads . The chief peculiarity consists in the method ...
Seite 22
... length of stroke can be varied by adjusting a collar - pin in any one of several holes placed in the crank at different distances from the centre of its shaft . Separate drums are provided both for winding out the drilling rope and the ...
... length of stroke can be varied by adjusting a collar - pin in any one of several holes placed in the crank at different distances from the centre of its shaft . Separate drums are provided both for winding out the drilling rope and the ...
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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