A Treatise on Practical and Theoretical Mine Ventilation |
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Page 41
... friction against the walls or sides of the airways . When air travels the galleries of a mine , it rubs against all the ... rubbing - surface , or sides , but often encoun- ters short turns , brattices , etc. , which adds greatly to the ...
... friction against the walls or sides of the airways . When air travels the galleries of a mine , it rubs against all the ... rubbing - surface , or sides , but often encoun- ters short turns , brattices , etc. , which adds greatly to the ...
Page 42
... rubbing - surface is found by multiplying the perime- eter by the length of the airway . Problem . What is the rubbing - surface of an airway 500 ' long , with an area of 6 ' x 6 ' ? Solution.6 + 6 + 6 + 6 = 24 ' ; then 24 ' X 500 ...
... rubbing - surface is found by multiplying the perime- eter by the length of the airway . Problem . What is the rubbing - surface of an airway 500 ' long , with an area of 6 ' x 6 ' ? Solution.6 + 6 + 6 + 6 = 24 ' ; then 24 ' X 500 ...
Page 43
... rubbing - surface . Above , it was perimeter than a square airway of the same diameter ; and hence , if the two airways have the same length , the circular will have less rubbing - surface . shown that a circular airway had less 6 17 ...
... rubbing - surface . Above , it was perimeter than a square airway of the same diameter ; and hence , if the two airways have the same length , the circular will have less rubbing - surface . shown that a circular airway had less 6 17 ...
Page 47
... rubbing - surface , the less will be this resistance . This co - efficient cannot be determined with any degree of certainty except by actual experi- ment ; and even then experimenters differ in the exact amount , because of the ...
... rubbing - surface , the less will be this resistance . This co - efficient cannot be determined with any degree of certainty except by actual experi- ment ; and even then experimenters differ in the exact amount , because of the ...
Page 48
... rubbing - surface exposed to the air - current , at a velocity of 1,000 feet per minute , or 0.0000000217 pound for a velocity of 1 foot per minute . We must also bear in mind , that , while we use h in the following formulas for the ...
... rubbing - surface exposed to the air - current , at a velocity of 1,000 feet per minute , or 0.0000000217 pound for a velocity of 1 foot per minute . We must also bear in mind , that , while we use h in the following formulas for the ...
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Other editions - View all
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...