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 59
Stran 28
... gravel and earth whose thickness varies from a few inches to five or six feet in depth , to distinguish them from deep placers or detrital accumulations found in ancient channels covering large areas , and varying from one hundred to ...
... gravel and earth whose thickness varies from a few inches to five or six feet in depth , to distinguish them from deep placers or detrital accumulations found in ancient channels covering large areas , and varying from one hundred to ...
Stran 29
... gravel alone , resting directly on the surface , or as accumu- lations of detritus , consisting of gravel , sand , drift , pebbles and boulders of all sizes , covered with lava and other volcanic products . Their geological ages are ...
... gravel alone , resting directly on the surface , or as accumu- lations of detritus , consisting of gravel , sand , drift , pebbles and boulders of all sizes , covered with lava and other volcanic products . Their geological ages are ...
Stran 30
... gravel channels are from a few hundred to several thousand feet wide , and range from the shallow placer to a drift six or seven hundred feet in depth . Their richness in gold varies in general , as well as in particular , in the many ...
... gravel channels are from a few hundred to several thousand feet wide , and range from the shallow placer to a drift six or seven hundred feet in depth . Their richness in gold varies in general , as well as in particular , in the many ...
Stran 31
... gravel of the channel deposit which passes through Columbia Hill , Nevada County , has in several instances been suc- cessfully washed . This is especially remarkable on account of the great depth of this deposit , which from the ...
... gravel of the channel deposit which passes through Columbia Hill , Nevada County , has in several instances been suc- cessfully washed . This is especially remarkable on account of the great depth of this deposit , which from the ...
Stran 32
... Gravel Mining Co. 0 10- 20- 30- 40- 50- 60- Soil Color found in most every pan in this top gravel . 70- Good gravel . 80- 90 Blue Gravel from top down for 50 feet . averaged about 10 colors to the pan . 100- Streaks of Clay through Gravel ...
... Gravel Mining Co. 0 10- 20- 30- 40- 50- 60- Soil Color found in most every pan in this top gravel . 70- Good gravel . 80- 90 Blue Gravel from top down for 50 feet . averaged about 10 colors to the pan . 100- Streaks of Clay through Gravel ...
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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.