Отзывы - Написать отзыв
Не удалось найти ни одного отзыва.
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
acid amount appears average become blast bottom carbon carried cast cause cent coal coke Company connection considerable consumption containing continued copper cost County deposits depth direction effect engine entirely equal expense experiments extent fact feet fuel furnace give gold greater hearth heat important improvements inches increase interest iron known Lake land lead length less lime loss lower manufacture mass materials matter means metal Michigan miles mill mineral mines months mountains nearly obtained operation oxide pass portion practical present produced proportion quantity quartz Railroad reduced region rich river road roasting rock sand separated shaft side silver smelting stamps steam steel sufficient superior supply surface taken temperature thickness tion tons upper usually vein washing weight whole yield
Стр. 183 - 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. 183 - 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. 184 - 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. 57 - 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...