The Mining Magazine: Devoted to Mines, Mining Operations, Metallurgy, &c., &c, Volume 71856 - Mineral industries |
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Page 30
... average quantity of ore crushed by one of these mills in twenty - four hours , is about forty bushels , or two tons . A stream of water enters over the rim upon one side of the tub , and is discharged over the rim on the opposite side ...
... average quantity of ore crushed by one of these mills in twenty - four hours , is about forty bushels , or two tons . A stream of water enters over the rim upon one side of the tub , and is discharged over the rim on the opposite side ...
Page 39
... average yield of the mixture to 50 or under , consequently , the consumption of fuel will be for an ore of this richness . In smelting argillaceous ore , 50 cwts . of coal , containing 87 per cent . of carbon , is consumed for each ton ...
... average yield of the mixture to 50 or under , consequently , the consumption of fuel will be for an ore of this richness . In smelting argillaceous ore , 50 cwts . of coal , containing 87 per cent . of carbon , is consumed for each ton ...
Page 41
... average of 5 years , selected at inter- vals of 5 years , during 22 years working , we find that the yields of coal per ton of crude iron produced at the foundry - iron furnace were , in the winter months , 49.7 cwts .; spring , 52.2 ...
... average of 5 years , selected at inter- vals of 5 years , during 22 years working , we find that the yields of coal per ton of crude iron produced at the foundry - iron furnace were , in the winter months , 49.7 cwts .; spring , 52.2 ...
Page 42
... average 76.4 of carbon , and 6 of ash , - total of car- bon and ash , 82.4 per cent . They lose 55 per cent . by weight in coking , or 37.4 below the amount of carbon and ash . This loss of 37.4 parts out of 76.4 is equal to a ...
... average 76.4 of carbon , and 6 of ash , - total of car- bon and ash , 82.4 per cent . They lose 55 per cent . by weight in coking , or 37.4 below the amount of carbon and ash . This loss of 37.4 parts out of 76.4 is equal to a ...
Page 43
... averages 38 cwts . of a coal containing 76 per cent . of carbon , equal to 3,234 lbs . To this must be added the ... average consumption with the argillaceous . class is 4,480 lbs . , or 1,154 lbs . less than the carbonaceous . Judg ...
... averages 38 cwts . of a coal containing 76 per cent . of carbon , equal to 3,234 lbs . To this must be added the ... average consumption with the argillaceous . class is 4,480 lbs . , or 1,154 lbs . less than the carbonaceous . Judg ...
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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
Popular passages
Page 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.
Page 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.
Page 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.
Page 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...
Page 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...
Page 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.
Page 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.
Page 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...
Page 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.
Page 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...