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 68
Seite xii
... Screws 299 Guides Pulleys Skips and Cages Shape and Construction 291 Expansion 292 Condensation . 293 Compound Engines 296 Winding from Great Depths Blanchet Pneumatic System • 286 | 287 288 Flat Ropes Conical and Spiral Drums 290 291 ...
... Screws 299 Guides Pulleys Skips and Cages Shape and Construction 291 Expansion 292 Condensation . 293 Compound Engines 296 Winding from Great Depths Blanchet Pneumatic System • 286 | 287 288 Flat Ropes Conical and Spiral Drums 290 291 ...
Seite 15
... screw thread is generally employed , and the socket made deeper than the screw , in order that the shoulders of two successive rods should bear firmly against each other , thereby preventing the risk of stripping. SEARCH FOR COAL . 15 70 ...
... screw thread is generally employed , and the socket made deeper than the screw , in order that the shoulders of two successive rods should bear firmly against each other , thereby preventing the risk of stripping. SEARCH FOR COAL . 15 70 ...
Seite 16
... 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 between it and the main length attached to the tool ...
... 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 between it and the main length attached to the tool ...
Seite 18
... screw joints , alter the structure of the iron , and break the tool which receives the blow , but it sets up excessive vibration in the rods , injures the sides of the hole , and accumulates a mass of broken material above the tool ...
... screw joints , alter the structure of the iron , and break the tool which receives the blow , but it sets up excessive vibration in the rods , injures the sides of the hole , and accumulates a mass of broken material above the tool ...
Seite 21
... screw threads . The chief peculiarity consists in the method of mounting the walking beam , which is sup- ported on a bearing resting on a cross - beam , between which and a * Coll . Guard . , lxxvii , 60 . second cross - beam , also ...
... screw threads . The chief peculiarity consists in the method of mounting the walking beam , which is sup- ported on a bearing resting on a cross - beam , between which and a * Coll . Guard . , lxxvii , 60 . second cross - beam , also ...
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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