The Mining and Statistic Magazine: Devoted to Mines, Mining Operations, Metallurgy, &c., &c, المجلد 101858 |
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acid adit alloy aluminium American amount anthracite appears average Bars beds bituminous coal blast blast furnaces boiler Canal carbon cent charcoal clay coal trade coke contains copper cost Dahlonega deposits depth district Ditto engine extent fact fathom level favorable feet Franklinite fuel furnace geological gold granite gravel heat Hill important inches increase interest iron pyrites Iron Ridge labor Lake Superior lead Lehigh less limestone lode manufacture mass matter metal Michigan miles mineral Minesota Mining Company mining operations North Carolina obtained oxide Penn Pennsylvania Philadelphia pig iron pig metal Pittsburg portion pounds present production profit puddling puddling furnace pyrites quantity quartz railroad region reverberatory furnace river rocks rods sand Schuylkill shaft sheet silver slate smelting South steam steel strata sulphur surface thick tion tons Total Valley vein yield York zinc
مقاطع مشهورة
الصفحة 204 - ... this alloy. Consequently, analysis has shown that their bronzes are of very variable composition, some of them containing the proper quantity of tin, and others being nearly pure copper. Indeed, this difficulty has not always been overcome in modern works. The statue of Desaix, in the Place Dauphine", and the great column in the Place Vendome, are signal instances of failure in this respect. On analyzing, separately, specimens taken from the bas-reliefs of the pedestal of this column, from the...
الصفحة 132 - Point, was a conspicuous object, known to the "voyageurs" as "the green rock," and had given a name to that beautiful harbor long before it became the center of the copper excitement. A little work was done here in the autumn of 1844, but on clearing away the ground on the opposite side of the harbor, where Fort Wilkins now stands, numerous boulders of black oxide of copper were found, evidently belonging to a vein near at hand, which was discovered in December, and proved to be a continuation of...
الصفحة 133 - ... it. On calculating the number of fathoms of the vein removed in the drifts, shafts and slopes, I find it to be, approximately, 8,270 ; and there has been produced an average amount of 761 pounds of copper per fathom — a result which is truly astonishing, when it is considered that the whole of the vein has been taken down...
الصفحة 217 - As soon as these grains appear, the damper is to be three-quarters shut, and the process closely inspected while the mass is being puddled to and fro beneath the covering layer of cinder. During the whole of this process, the heat should not be raised above cherry redness, or the welding heat of shear steel. The blue jets of flame gradually disappear, while the formation of grains continues, which grains very soon begin to fuse together, so that the mass becomes waxy, and has the above-mentioned...
الصفحة 158 - States, viz. : — 1 21 anthracite furnaces, and 500 charcoal and coke, 300 forges, and 210 rolling mills. The furnaces produced in 1856 about 787,958 tons of pig metal, from the various ores, to which must be added 6,500 tons produced from the ore by the bloomery forges. The entire production of iron in 1856 was nearly eight hundred thousand tons.
الصفحة 214 - ... from the postpliocene and recent deposits of this country, have frequently been submitted to my inspection. Many of these I have unhesitatingly pronounced to be relics of the domestic horse, though I feel persuaded that many remains of an extinct species are undistinguishable from the recent one. " Whether more than one extinct species is indicated among the numerous specimens of teeth I have had the opportunity of examining, I have been unable satisfactorily to determine. The specimens present...
الصفحة 229 - The first object was to light the ladders, and afterwards to extend the system to the working chambers following the lode. The mine selected for experiment was the Balleswidden Mine. The gas introduced to this mine was manufactured at the surface, and was forced by a pump into a heavy...
الصفحة 159 - ... States. 1. Northern New York, once including Vermont, and using the fine primitive ores of the Adirondac mountains. Here are forty bloomeries, and three anthracite furnaces. 2. The Highlands, a narrow belt extending through Berkshire, Massachusetts, into southern Vermont, and through northern New Jersey into Pennsylvania, containing forty-four charcoal, and twenty-two anthracite furnaces, and sixty forges, using hematite and magnetic ores. 3. Eastern Pennsylvania and north-eastern Maryland, with...
الصفحة 133 - I find it to be, approximately, 8,270 ; and there has been produced an average amount of 761 pounds of copper per fathom — a result which is truly astonishing, when it is considered that the whole of the vein has been taken down."* It runs about north 27° west, and its underlay is about 10° to the east, but in its lower levels the dip varies somewhat.
الصفحة 52 - The rod being properly held by those with whom it will answer, when the toe of the right foot is within the semi-diameter of the piece of metal or other...