A Treatise on Practical and Theoretical Mine VentilationJ. Wiley & Sons, 1884 - 141 страница |
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Страница 22
... velocity of 32.16 ' at the end of the first second : hence we have ( 2 ) v = √4gh = 8.0208 √π . In this equation h represents the necessary height , in feet , of a vertical air - column which will produce by its weight a velocity ...
... velocity of 32.16 ' at the end of the first second : hence we have ( 2 ) v = √4gh = 8.0208 √π . In this equation h represents the necessary height , in feet , of a vertical air - column which will produce by its weight a velocity ...
Страница 23
... velocity . CHAPTER II . NATURAL VENTILATION . 10. MOTION in air is caused by pressure , or differ- ence of pressure . When air becomes heated , it ascends , because it assumes a larger volume ; A E and , as the same volume of cold air ...
... velocity . CHAPTER II . NATURAL VENTILATION . 10. MOTION in air is caused by pressure , or differ- ence of pressure . When air becomes heated , it ascends , because it assumes a larger volume ; A E and , as the same volume of cold air ...
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... velocity of wind between twenty - five and thirty miles per hour . 11. The " motive - column " is a " head of air " of such a height that it will equal the difference between the weight of the downcast and upcast columns of air . Let M ...
... velocity of wind between twenty - five and thirty miles per hour . 11. The " motive - column " is a " head of air " of such a height that it will equal the difference between the weight of the downcast and upcast columns of air . Let M ...
Страница 28
... the inlet and outlet should be as nearly as practicable on the same level . High winds , directed by hills , blowing against the exhaust duct of a fan , greatly impede its action . TABLE III . VELOCITY AND POWER OF WINDS ( SMEATON.
... the inlet and outlet should be as nearly as practicable on the same level . High winds , directed by hills , blowing against the exhaust duct of a fan , greatly impede its action . TABLE III . VELOCITY AND POWER OF WINDS ( SMEATON.
Страница 29
Eugene Benjamin Wilson. TABLE III . VELOCITY AND POWER OF WINDS ( SMEATON ) . Perpendicular force on Velocity . Miles per hour . one square foot , in pounds avoirdupois . Common appellation of such winds . 100 MX8JAHUNNUGAL .005 .079 ...
Eugene Benjamin Wilson. TABLE III . VELOCITY AND POWER OF WINDS ( SMEATON ) . Perpendicular force on Velocity . Miles per hour . one square foot , in pounds avoirdupois . Common appellation of such winds . 100 MX8JAHUNNUGAL .005 .079 ...
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Чести термини и фразе
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
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Страница 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.
Страница 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.
Страница 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.
Страница 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.
Страница xxxi - Every person above the age of twenty-one years, who is a citizen of the United States...
Страница 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...
Страница 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.
Страница 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...
Страница 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...
Страница 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...