Report on the Mining Methods and Appliances Used in the Anthracite Coal FieldsBoard of Commissioners, 1883 - 579 páginas |
Dentro del libro
Resultados 1-5 de 73
Página 12
... eight or ten feet in thick- ness . While the existence of these partings is usually det rimental , it sometimes happens that a thick parting divid- ing a large bed into two benches that may be mined as sep- arate beds , is a great ...
... eight or ten feet in thick- ness . While the existence of these partings is usually det rimental , it sometimes happens that a thick parting divid- ing a large bed into two benches that may be mined as sep- arate beds , is a great ...
Página 28
... eight inches . The legs should be set in a step two or three inches deep , but the bottom of this step should , if possible , be above water - level in the ditch ; when the roof is very loose and bad , they should not be more than three ...
... eight inches . The legs should be set in a step two or three inches deep , but the bottom of this step should , if possible , be above water - level in the ditch ; when the roof is very loose and bad , they should not be more than three ...
Página 30
... eight inches thick may be used for the crib - work , but square stuff is better as it can be more easily and accurately fitted . The distance between the cribbing girts will depend en- tirely upon the character of the ground and depth ...
... eight inches thick may be used for the crib - work , but square stuff is better as it can be more easily and accurately fitted . The distance between the cribbing girts will depend en- tirely upon the character of the ground and depth ...
Página 32
... ( eight or ten feet . ) Prospecting by boring . When the rocks which are supposed to contain coal or other valuable mineral lie deeply buried from sight beneath a mass of other rocks the cheapest means of obtaining a knowledge of their ...
... ( eight or ten feet . ) Prospecting by boring . When the rocks which are supposed to contain coal or other valuable mineral lie deeply buried from sight beneath a mass of other rocks the cheapest means of obtaining a knowledge of their ...
Página 33
... eight , twelve , or sixteen feet , with one or two shorter pieces . A small pair of jars is sometimes used in deep holes but is much more serviceable when a rope is substituted for the rods and the tools made somewhat heavier . A sand ...
... eight , twelve , or sixteen feet , with one or two shorter pieces . A small pair of jars is sometimes used in deep holes but is much more serviceable when a rope is substituted for the rods and the tools made somewhat heavier . A sand ...
Contenido
275 | |
281 | |
290 | |
297 | |
307 | |
313 | |
324 | |
328 | |
87 | |
102 | |
109 | |
113 | |
115 | |
116 | |
145 | |
151 | |
156 | |
160 | |
166 | |
170 | |
176 | |
182 | |
193 | |
199 | |
204 | |
211 | |
217 | |
227 | |
235 | |
241 | |
248 | |
253 | |
259 | |
269 | |
337 | |
344 | |
351 | |
357 | |
367 | |
369 | |
379 | |
388 | |
394 | |
403 | |
413 | |
423 | |
433 | |
439 | |
445 | |
452 | |
456 | |
459 | |
467 | |
473 | |
480 | |
488 | |
503 | |
525 | |
549 | |
Otras ediciones - Ver todas
Report on the Mining Methods and Appliances Used in the Anthracite Coal ... H. M. Chance Sin vista previa disponible - 2017 |
Report on the Mining Methods and Appliances Used in the Anthracite Coal ... H. M. Chance Sin vista previa disponible - 2015 |
Términos y frases comunes
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
Pasajes populares
Página 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.
Página 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...
Página 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...
Página 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.
Página 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...
Página 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...
Página 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...