The Mining Magazine: Devoted to Mines, Mining Operations, Metallurgy, &c., &c, Том 71856 |
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Стр. 39
... hearth . The quantity of shale used increases with the percentage of metal in the ore , sufficient being added to reduce the average yield of the mixture to 50 or under , consequently , the consumption of fuel will be for an ore of this ...
... hearth . The quantity of shale used increases with the percentage of metal in the ore , sufficient being added to reduce the average yield of the mixture to 50 or under , consequently , the consumption of fuel will be for an ore of this ...
Стр. 43
... hearth , for the fusion of the refractory mass adhering to the sides of the hearth , and around the tuyeres . The proportion is increased according to the exigencies of the case , from 45 , the usual yield , to 60 or 70 cwts . to the ...
... hearth , for the fusion of the refractory mass adhering to the sides of the hearth , and around the tuyeres . The proportion is increased according to the exigencies of the case , from 45 , the usual yield , to 60 or 70 cwts . to the ...
Стр. 45
... hearth is lowered , by an excess of carbon , the temperature in the upper part , and in the boshes is augmented . With a rigid economy of fuel , the depth of the zone of fusion is limited , and of the caloric evolved during the ...
... hearth is lowered , by an excess of carbon , the temperature in the upper part , and in the boshes is augmented . With a rigid economy of fuel , the depth of the zone of fusion is limited , and of the caloric evolved during the ...
Стр. 47
... hearth is lowered , and the separation of the metal rendered less perfect . If the lime is greatly in excess , and the consumption of coal is augmented in proportion , the resulting crude iron possesses all the characteristic properties ...
... hearth is lowered , and the separation of the metal rendered less perfect . If the lime is greatly in excess , and the consumption of coal is augmented in proportion , the resulting crude iron possesses all the characteristic properties ...
Стр. 48
... hearth and , combining with the metal , contaminates its qualities by di- minishing its strength and other properties . A weak coal , if used in the raw state , is very liable to be splintered by the high temperature of the ascending ...
... hearth and , combining with the metal , contaminates its qualities by di- minishing its strength and other properties . A weak coal , if used in the raw state , is very liable to be splintered by the high temperature of the ascending ...
Другие издания - Просмотреть все
The Mining Magazine: Devoted to Mines, Mining Operations, Metallurgy ..., Том 3 Полный просмотр - 1854 |
The Mining Magazine: Devoted to Mines, Mining Operations, Metallurgy ..., Том 4 Полный просмотр - 1855 |
The Mining Magazine: Devoted to Mines, Mining Operations, Metallurgy ..., Том 8 Полный просмотр - 1857 |
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adit amalgamation amount anthracite appears average basin Bessemer's bituminous coal blast furnace boiler boshes bottom caloric Canal cannel coal carbonic acid cast cent cinder Coal Trade coke cold blast combustion Company considerable consumption containing copper cost crude iron cwts cylinder degs deposits depth diameter Dowlais effect engine feet fuel gases gold gossan hearth heat hot blast inches increase Lake Superior Lehigh Lehigh Valley Railroad lime limestone lode malleable iron manufacture mass materials metal miles mill mineral mines mountains naphtha nearly obtained operation oxide pig iron portion present produced proportion pyrites quantity quartz Railroad reduced region rich river road roasting rock sand sandstone seams shaft side silica silver smelting specific gravity specimens stamps steam steel strata sulphate sulphur sulphuret surface temperature thickness throat tion tons tuyeres upper vein washing yield
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Стр. 185 - That the section number sixteen, in every township, and where such section has been sold, granted or disposed of, other lands equivalent thereto and most contiguous to the same, shall be granted to the inhabitants of such township, for the use of schools.
Стр. 185 - The appropriation of public lands for that object became a fundamental principle, by the Ordinance of 1787, which settled terms of compact between the people and States of the Northwestern Territory, and the original States, unalterable except by consent.
Стр. 186 - That sections numbered sixteen and thirty-six in every township of public lands in said State, and where either of said sections, or any part thereof, has been sold or otherwise disposed of, other lands, equivalent thereto, and as contiguous as may be, shall be granted to said State for the use of schools.
Стр. 400 - And thus it will be seen, that by a single process, requiring no manipulation or particular skill, and with only one workman, from three to five tons of crude iron...
Стр. 420 - ... least. Whenever a garnet or a lump of quartz was imbedded in compact feldspar and favorably presented to the action of the sand, the feldspar was cut away around the hard mineral, which was thus left standing in relief above the general surface. A portion however, of the feldspar, on the lee side of the garnets, being protected from the action of the sand by the superior hardness of the gem, also stood out in relief, forming an elevated string, osar-like, under their lee. When the surface acted...
Стр. 400 - Л large portion of this metal is, however, recoverable by treating with carbonaceous gases the rich oxides thrown out of the furnace during the boil. These slags are found to contain innumerable small grains of metallic iron, which are mechanically held in suspension in the slags, and may be easily recovered.
Стр. 423 - Strength and other Properties of Metals: Reports of Experiments on the Strength and other Properties of Metals for Cannon. With a Description of the Machines for testing Metals, and of the Classification of Cannon in service. By Officers of the Ordnance Department US Army. By authority of the Secretary of War. Illustrated by 25 large steel plates. In one volume, 4to. . $10.00 SULLIVAN. — Protection to Native Industry. By Sir EDWARD SULLIVAN, Baronet, author of " Ten Chapters on Social Reforms.
Стр. 401 - I have described will have no hard or steely parts, such as is found in puddle iron, requiring a great amount of rolling to blend them with the general mass, nor will such ingots require an excess of rolling to expel cinder from the interior of the mass, since none can exist in the ingot, which is pure and perfectly homogeneous throughout, and hence requires only as much rolling as is necessary for the development of fibre ; it therefore follows that, instead of forming a merchant bar or rail by...
Стр. 400 - ... into the condition of several piles of malleable iron, in from thirty to thirty-five minutes, with the expenditure of about one-third part the blast now used in a finery furnace with an equal charge of iron, and with the consumption of no other fuel than is contained in the crude iron.
Стр. 59 - Although the art of building has been practised from the earliest times, and constant demands have been made, in every age, for the means of determining the best materials, yet the process of ascertaining the strength and durability of stone appears to have received but little definite scientific attention, and the commission, who...