A Text-book of Coal-mining: For the Use of Colliery Managers and OthersCharles Griffin & Company, 1904 - 563 Seiten |
Im Buch
Ergebnisse 1-5 von 100
Seite 14
... consist in carefully examining surface indications to determine the nature and position of the beds exposed in the area ... consists of some heavy instrument of the " scoop " kind , the general form being a cylinder , the cutting edge ...
... consist in carefully examining surface indications to determine the nature and position of the beds exposed in the area ... consists of some heavy instrument of the " scoop " kind , the general form being a cylinder , the cutting edge ...
Seite 16
... consists of a collar gradually working down a long screw . When the limit of travel of this instrument is reached , it is detached , the screw run back into the position shown in the illustration , and a short length of rod inserted ...
... consists of a collar gradually working down a long screw . When the limit of travel of this instrument is reached , it is detached , the screw run back into the position shown in the illustration , and a short length of rod inserted ...
Seite 17
... consists of a wooden pole having one end fixed to the ground , a fulcrum placed further on , and the rods attached to the other end . The blow is struck by depressing the beam , the rods being raised by the elasticity of it . The ...
... consists of a wooden pole having one end fixed to the ground , a fulcrum placed further on , and the rods attached to the other end . The blow is struck by depressing the beam , the rods being raised by the elasticity of it . The ...
Seite 18
... consists of two fangs or pincers ( a , a ' , Fig . 18 ) , working about centres b , b ' . These fangs are enclosed at their upper extremity by a collar c , con- nected to a circular disc of leather d , through a rod e ; at their lower ...
... consists of two fangs or pincers ( a , a ' , Fig . 18 ) , working about centres b , b ' . These fangs are enclosed at their upper extremity by a collar c , con- nected to a circular disc of leather d , through a rod e ; at their lower ...
Seite 20
... consisting of four or five chisels , arranged round a cylinder ( Fig . 21 ) , which cuts away an annular space , leaving ... consists of a heavy cylinder of iron attached to a rope of bamboo fibres , the torsion of which is sufficient to ...
... consisting of four or five chisels , arranged round a cylinder ( Fig . 21 ) , which cuts away an annular space , leaving ... consists of a heavy cylinder of iron attached to a rope of bamboo fibres , the torsion of which is sufficient to ...
Inhalt
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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