Report on the Mining Methods and Appliances Used in the Anthracite Coal Fields |
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Page 10
... upper part of the coal measures usually consists of softer rocks than the lower sub - divisions . The hardest rocks are , of course , found in the Conglomerate at the base of the coal measures proper . Comparing these rocks with rocks ...
... upper part of the coal measures usually consists of softer rocks than the lower sub - divisions . The hardest rocks are , of course , found in the Conglomerate at the base of the coal measures proper . Comparing these rocks with rocks ...
Page 35
... upper end of the rods , and the rods are lifted , and allowed to fall , by two men stand- ing opposite each other . The drill is rotated by the men who walk slowly around , taking one short step at each stroke of the drill . Sand ...
... upper end of the rods , and the rods are lifted , and allowed to fall , by two men stand- ing opposite each other . The drill is rotated by the men who walk slowly around , taking one short step at each stroke of the drill . Sand ...
Page 38
... upper dead center , the slack in the cable is taken up , ( by turning the bull - wheels ) , until the jars are about two - thirds open , and the temper- screw is then clamped to the rope . The bull - wheel is then given several backward ...
... upper dead center , the slack in the cable is taken up , ( by turning the bull - wheels ) , until the jars are about two - thirds open , and the temper- screw is then clamped to the rope . The bull - wheel is then given several backward ...
Page 50
... upper rocks of soft slates or shales . If a lateral com- pressing ( flexing ) force acts upon such a series , the lower massive formation will yield in curves of large radii , while the overlying softer strata , compressed in the trough ...
... upper rocks of soft slates or shales . If a lateral com- pressing ( flexing ) force acts upon such a series , the lower massive formation will yield in curves of large radii , while the overlying softer strata , compressed in the trough ...
Page 51
... upper series . 3. When large masses of approximately uniform hard- ness are contorted by compression , the resulting curves bear close complementary relations to each other . ( See Fig . 8. ) The first of the above propositions has ...
... upper series . 3. When large masses of approximately uniform hard- ness are contorted by compression , the resulting curves bear close complementary relations to each other . ( See Fig . 8. ) The first of the above propositions has ...
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Other editions - View all
Report on the Mining Methods and Appliances Used in the Anthracite Coal ... H. M. Chance No preview available - 2017 |
Report on the Mining Methods and Appliances Used in the Anthracite Coal ... H. M. Chance No preview available - 2015 |
Common terms and phrases
accidents acid acid gas adopted airway amount angle anthracite coal anthracite regions anticlinal Atlas Sheet average bars basin bituminous bituminous coal boiler boss bottom brake brake band brattice breaker breasts built cage carbonic carbonic acid cent coal breaker cost depth diameter dirt distance drill driven drum dump eight empty Explosions fire fire boss fire-damp friction gangway gear gunboat haulage Hazleton head-frame holes inches inclined inside iron large number Lehigh less lever lift located manway method miner mining engineers mules necessary operated outcrop outlet pass pillars plane plate Pottsville District props pumps raised rock rods roof Roof-falls rope screen seam shaft or slope sheaves shown by Fig shute side sinking slate starting friction steam sufficient surface thick timber tion tons track tunnel underground usually ventilation wheels width Wilkes-Barre winding engine wire rope Wyoming basin yards
Popular passages
Page 504 - ... neglect or failure aforesaid, a right of action shall accrue to the widow and lineal heirs of the person whose life shall be lost for like recovery of damages for the injury they shall have sustained.
Page 513 - The owner or agent of every coal mine shall provide at least two shafts, or slopes, or outlets, separated by natural strata of not less than one hundred and fifty feet in breadth, by which shafts, slopes, or outlets distinct means of ingress and egress are always available to the persons employed in the coal mine...
Page 508 - ... employed therein, any but experienced, competent and sober engineers ; and no engineer in charge of such engine shall allow any person, except such as may be deputed for that purpose, by the owner or agent, to interfere with it or any part of the machinery, and no person shall interfere or in any way intimidate the engineer in the discharge of his duties ; and...
Page 497 - ... and shall ascertain that the mine is free from danger, and the workmen shall not enter the mine until such examination has been made and reported, and the cause of danger, if any, be removed.
Page 499 - It shall be the duty of the inspector upon being notified as herein provided to immediately repair to the scene of the accident, and make such suggestions as may appear necessary to secure the future safety of the men ; and if the results of the explosion...
Page 503 - ... or shall handle or disturb any part of the machinery of the hoisting engine, or open a door to a mine and not have the same closed again, whereby danger is produced, either...
Page 504 - For any injury to person or property, occasioned by any willful violation« of this Act, or willful failure to comply with any of its provisions, a right of action shall accrue to the party injured, for any direct damages sustained thereby...