A Treatise on Practical and Theoretical Mine Ventilation |
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Page 23
... air , rapidly or slowly . Suppose we have two shafts ( connected , as in the above figure ) of equal depths , the air in them having B 24 - MINE VENTILATION . - § 10 . the § 10 . 23 MINE VENTILATION . Natural Ventilation CHAPTER II.
... air , rapidly or slowly . Suppose we have two shafts ( connected , as in the above figure ) of equal depths , the air in them having B 24 - MINE VENTILATION . - § 10 . the § 10 . 23 MINE VENTILATION . Natural Ventilation CHAPTER II.
Page 24
... shafts , and the column AB lower in temperature than CD , a movement of the air then takes place from A towards C. On the contrary , if the external air be warmer than that of the shafts , the shaft AB will be the upcast , and circu ...
... shafts , and the column AB lower in temperature than CD , a movement of the air then takes place from A towards C. On the contrary , if the external air be warmer than that of the shafts , the shaft AB will be the upcast , and circu ...
Page 25
Eugene Benjamin Wilson. ventilation . Suppose the two shafts to be of equal depth , say 900 feet , and suppose the barometer to stand at 29 inches ; also let the temperature in the downcast be assumed to be 42 ° , and that of the upcast ...
Eugene Benjamin Wilson. ventilation . Suppose the two shafts to be of equal depth , say 900 feet , and suppose the barometer to stand at 29 inches ; also let the temperature in the downcast be assumed to be 42 ° , and that of the upcast ...
Page 26
... shafts make no differ- ence upon the total pressure , so far as the considera- This is tions regarding ventilation are concerned . termed " the pneumatic paradox ; " for if we have one square foot area for a downcast , and an upcast of ...
... shafts make no differ- ence upon the total pressure , so far as the considera- This is tions regarding ventilation are concerned . termed " the pneumatic paradox ; " for if we have one square foot area for a downcast , and an upcast of ...
Page 27
... shafts , which are equal in length ? Pounds . 900 cubic feet of air at 42 ° F. 71.406 900 cubic feet of air at 202 ° F. = 54.126 Difference in weight • 17.280 Suppose , now , the temperature of the downcast to be raised to 82 ° F ...
... shafts , which are equal in length ? Pounds . 900 cubic feet of air at 42 ° F. 71.406 900 cubic feet of air at 202 ° F. = 54.126 Difference in weight • 17.280 Suppose , now , the temperature of the downcast to be raised to 82 ° F ...
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Common terms and phrases
acres Act of Congress action adverse claim affidavit air passing air-column airway amicus curiæ amount anemometer application asphyxia barometer brattice circulation co-efficient Copp's Copp's Min court cubic feet cubic foot district ditch easements entry feet of air feet per minute filed fire-damp friction furnace held horse-power hundred inches issue ksv2 labor lamp land office Landowner Law Rep length lien lode claims marsh-gas ment mineral lands mining claims motive-column Mueseler lamp necessary notice owners party patent perimeter person placer claim plat possession posting pounds per square pressure per square prior public lands purchase purposes quantity of air quartz record regulations repealed resistance revolutions per minute rubbing-surface rules safety-lamp Section Sickels square feet square foot Stat statute surface survey temperature thereof tion tunnel United upcast vein or lode velocity VENTILATION volume of air water-gauge weight
Popular passages
Page xxxi - States governing their possessory title, shall have the exclusive right of possession and enjoyment of all the surface included within the lines of their locations, and of all veins, lodes, and ledges throughout their entire depth, the top or apex of which lies inside of such surface lines extended downward vertically, although such veins, lodes, or ledges may so far depart from a perpendicular in their course downward as to extend outside the vertical side lines of such surface locations.
Page xxxi - On each claim located after the tenth day of May, eighteen hundred and seventy-two, and until a patent has been issued therefor, not less than one hundred dollars' worth of labor shall be performed or improvements made during each year.
Page xxxi - ... upon a failure to comply with these conditions, the claim or mine upon which such failure occurred shall be open to relocation in the same manner as if no location of the same had ever been made, provided that the original locators, their heirs, assigns, or legal representatives, have not resumed work upon the claim after failure and before such location.
Page xxxi - It shall be the duty of the adverse claimant, within thirty days after filing his claim, to commence proceedings in a court of competent jurisdiction, to determine the question of the right of possession, and prosecute the same with reasonable diligence to final judgment; and a failure so to do shall be a waiver of his adverse claim.
Page xxxi - Every person above the age of twenty-one years, who is a citizen of the United States...
Page 153 - Mining claims upon veins or lodes of quartz or other rock in place bearing gold, silver, cinnabar, lead, tin, copper, or other valuable deposits...
Page xxx - ... local customs or rules of miners in the several mining districts, so far as the same are applicable and not inconsistent with the laws of the United States.
Page xxxi - ... and he shall also post such notice in his office for the same period. The claimant at the time of filing this application, or at any time thereafter, within the sixty days of publication, shall file with the register a certificate of the United States surveyor general that five hundred dollars...
Page xxxi - ... survey and sale, there have been homesteads made by citizens of the United States, or persons who have declared their intention to become citizens, which homesteads have been made, improved, and used for agricultural...
Page xxxi - Whenever, by priority of possession, rights to the use of water for mining, agricultural, manufacturing or other purposes, have vested and accrued, and the same are recognized and acknowledged by the local customs, laws and the decisions of courts, the possessors and owners of such vested rights shall be maintained and protected in the same...