TransactionsAmerican Institute of Mining, Metallurgical, and Petroleum Engineers, American Institute of Mining Engineers The Institute, 1879 Some vols., 1920-1949, contain collections of papers according to subject. |
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Zadetki 1–5 od 60
Stran 6
... cubic feet of air per minute , while the Oakwood fan , at thirty - five revolutions , was exhausting 73,000 feet . This aggregate of 130,000 cubic feet of air per minute was required to prevent the accumulation of fire - damp in ...
... cubic feet of air per minute , while the Oakwood fan , at thirty - five revolutions , was exhausting 73,000 feet . This aggregate of 130,000 cubic feet of air per minute was required to prevent the accumulation of fire - damp in ...
Stran 31
... cubic yard , could be successfully worked by the hydraulic method . Experience has proved that the quantity of gold found in " top- gravel " is insufficient to warrant any large investment based solely on its value . Under exceptional ...
... cubic yard , could be successfully worked by the hydraulic method . Experience has proved that the quantity of gold found in " top- gravel " is insufficient to warrant any large investment based solely on its value . Under exceptional ...
Stran 35
... cubic yards of top gravel ( 1870–74 ) , yielding 2.9 cents per cubic yard , and leaving a profit of only $ 2232.84 , that determined capitalists interested in these claims to investigate the question of the comparative values of the ...
... cubic yards of top gravel ( 1870–74 ) , yielding 2.9 cents per cubic yard , and leaving a profit of only $ 2232.84 , that determined capitalists interested in these claims to investigate the question of the comparative values of the ...
Stran 36
... cubic yards top gravel * yielded 2 cents per cubic yard . The bottom gravel † ( four feet deep ) was then washed up , when it was discovered that this ground had been ex- tensively drifted ; but notwithstanding this fact , 4966 cubic ...
... cubic yards top gravel * yielded 2 cents per cubic yard . The bottom gravel † ( four feet deep ) was then washed up , when it was discovered that this ground had been ex- tensively drifted ; but notwithstanding this fact , 4966 cubic ...
Stran 38
... cubic yard insignificant amounts of precious metal , but in the aggregate , when expeditiously and skilfully worked , give large remunerative returns . THE DUMP . Without the dump , hydraulic mining is an impossibility . On this point ...
... cubic yard insignificant amounts of precious metal , but in the aggregate , when expeditiously and skilfully worked , give large remunerative returns . THE DUMP . Without the dump , hydraulic mining is an impossibility . On this point ...
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Amenia amount analyses arkose average bank bed-rock blast furnace bottom carbon cement cent charcoal claim clay coal Company containing copper cost Creek cubic feet cubic yard deposits diameter discharge district ditches drift ductility east engine Eureka flume footwall French Corral fuel galena gold grade gravel heat Hill hydraulic mining impurities Institute jigs lime limestone manganese manufacture mass material meeting miles mill miner's inches mineral nearly Nevada North Bloomfield nozzles obtained Ohio oxide Philadelphia phosphorus pipe pounds powder pressure production Prof quantity quartz quartzite reservoir Richmond riffles River rock salt sand sandstones seam shaft silica silicon slag slate sluices Smartsville square square miles steel strata Street surface temperature tenacity thick tion tons Total traced tunnel undercurrents vein washed welding power Wilkes-Barre wrought iron yield York City
Priljubljeni odlomki
Stran xxii - Treasurer shall be elected, and the term of office shall continue until the adjournment of the meeting at which their successors are elected.
Stran 389 - ... to file in the local Land Office a diagram of the same, so extended, laterally or otherwise, as to conform to the local laws, customs, and rules of miners, and to enter such tract and receive a patent therefor, granting such mine, together with the right to follow such vein or lode, with its dips, angles, and variations, to any depth, although it may enter the land adjoining, which land adjoining shall be sold subject to this condition.
Stran xxiii - All vacancies shall be filled by the appointment of the Council, and any person so appointed shall hold office for the...
Stran xxiv - Institute shall bo entitled to twelve copies, if printed, for his own use, and shall have the right to order any number of copies at the cost of paper and printing, provided said copies are not intended for sale.
Stran 225 - ... mile east of the neck at Dutch Gap, thence in a course a little less northwest to Richmond, where it is exposed in the ferruginous sandstones, the lowest stratum in the valley of Shocko Creek. It can also be noticed upon the top of the tableland stretching beyond the city along the James River within two or three miles west of Richmond, in isolated patches, in Henrico County.
Stran 55 - The size of the opening was taken with a measure (micrometer attached) which had been compared with and adjusted to a standard United States yard. Time was read to one-fifth of a second. The level of the water (drawn from a large reservoir) was determined with Boyden's hooks, micrometer adjustment.
Stran 385 - A patent of the United States for land, whether agricultural or mineral, is something upon which its holder can rely for peace and security in his possessions. In its potency it is ironclad against all mere speculative inferences.
Stran 385 - We are of opinion, therefore, that the term as used in the acts of congress is applicable to any zone or belt of mineralized rock lying within boundaries clearly separating it from the neighboring...
Stran 116 - None of the ingredients, except carbon, in the proportions present, seem to very notably aflect welding by ordinary methods. II. The strength of wrought iron and its welding power by ordinary methods are varied more by the amount of its reduction in rolling than by its ordinary differences in composition. Uniform strength may be promoted by uniform reduction, but only at such increased cost of manufacture that the practice is not likely to obtain. Therefore, the reduced strength of large bars made...
Stran 116 - Phosphorus up to 0.10 per cent does not harm, and probably improves, irons containing silicon not above 0.15, and carbon not above 0.03. None of the ingredients except carbon in the proportions present seem to very notably affect welding by ordinary methods.