Mining Magazine: Devoted to Mines, Mining Operations, Metallurgy & C, Volume 71856 |
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Page 17
... lower the temperature at which the operation of pressure is conducted , the larger will be the produce . The fluid pressed out is set aside , and after further rectification , if required , will yield another por- tion of solid matter ...
... lower the temperature at which the operation of pressure is conducted , the larger will be the produce . The fluid pressed out is set aside , and after further rectification , if required , will yield another por- tion of solid matter ...
Page 20
... lower the fire to stop ebullition , and draw off the watery solution through a pipe at the bottom of the boiler , and then close the neck connected with the upper con- denser , and open the other neck of the retort which is directly ...
... lower the fire to stop ebullition , and draw off the watery solution through a pipe at the bottom of the boiler , and then close the neck connected with the upper con- denser , and open the other neck of the retort which is directly ...
Page 38
... lower silu- rian has it synonyme in Stone River group and Nashville group . The analogies of the New York and Tennesseean systems are such as to afford the conclusion , that the rocks of the whole si- lurian basin of Tennessee ...
... lower silu- rian has it synonyme in Stone River group and Nashville group . The analogies of the New York and Tennesseean systems are such as to afford the conclusion , that the rocks of the whole si- lurian basin of Tennessee ...
Page 40
... lower than either of the others . It is with cokes as with coals -- the harder and denser the coke , and the more concentrated the carbon , the greater the re- ducing power . A light , hollow , spongy looking coke exposes too great a ...
... lower than either of the others . It is with cokes as with coals -- the harder and denser the coke , and the more concentrated the carbon , the greater the re- ducing power . A light , hollow , spongy looking coke exposes too great a ...
Page 46
... lower , and silex is present in large quantities , the consumption may be roughly estimated by adding the silex to that combined with the ore , and charging a sufficiency of limestone to produce the lime necessary for their fusion . As ...
... lower , and silex is present in large quantities , the consumption may be roughly estimated by adding the silex to that combined with the ore , and charging a sufficiency of limestone to produce the lime necessary for their fusion . As ...
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Common terms and phrases
adit amalgamation amount anthracite appears average basin Bessemer's blast furnace boiler boshes bottom caloric Canal cannel coal carbonic acid cast cent cinder coal coke cold blast combustion Company consumption containing copper cost crude iron cwts 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 matter metal miles mill mineral mines mountains naphtha nearly obtained operation oxide pig iron portion present produced proportion puddling furnace pyrites quantity quartz Railroad reduced region rich river road roasting rock sand sandstone seams shaft side silica silver skin smelting specific gravity specimens stamps steam steel strata substances sulphate sulphur sulphuret surface temperature thickness throat tion tons tuyeres upper veins washing yield
Popular passages
Page 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.
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...
Page 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.
Page 63 - ... lines of least resistance, and the remaining pressure must be sustained by the central portions around the vertical axis of the cube. After this important fact was clearly determined, lead and all other interposed substances were discarded, and a method devised by which the upper and lower surfaces of the cube could be ground into perfect parellelism.
Page 64 - That this may be so was clearly established in the experiments with the coarsely crystallized marbles examined by the commission. When these were submitted to a liquid which slightly tinged the stone, the coloration was more intense around the margin of each crystal, indicating a greater amount of absorption in these portions of the surface. The marble which was chosen for the Capitol is a dolomite, or is composed of carbonate of lime and magnesia in nearly atomic proportions. It was analyzed by...
Page 160 - ... push the skin into it so as to bind the wings closely to the sides. The cotton may be put in loosely, or a body the size of the original made by wrapping with threads. If the bird have long legs and neck, these had better be folded down over the body, and allowed to dry in that position. Economy of space is a great object in keeping skins, and such birds as herons, geese, swans, &c., occupy too much room when outstretched. In some instances, as among the ducks, woodpeckers, &c., the head is so...
Page 156 - Small seines for catching fishes in small streams. The two ends should be fastened to brails or sticks (hoe-handles answer well), which are taken in the hands of two persons, and the net drawn both up and down stream. Fishes may often be caught by stirring up the gravel or small stones in a stream, and drawing the net rapidly down the current. Bushes or holes along the banks may be inclosed by the nets, and stirred so as to drive out the fishes, which usually lurk in such localities. These nets may...
Page 460 - ... with me — This is a remarkable fact and one very easy to imitate ; if, through a hollow boring rod, water be sent down into the bore-hole as it is sunk, the water, in coming up again, must bring with it all the drilled particles. On this principle I started to establish a new method of boring. The apparatus is composed of a hollow boring rod, formed of wrought iron tubes screwed end to end : the lower end of the hollow rod is armed with a perforating tool, suited to the character of the strata...
Page 419 - The elevation of the summit-level is 2,808 feet above the Pacific, and the width of the gap at that point is about two miles ; from this the ground slopes each way very gradually, the grade or descent on the east, for about 28 miles, being on an average 69 feet per mile. On this eastern declivity of the pass, — the side turned...
Page 61 - ... convinced that the only entirely reliable means of ascertaining the comparative capability of marble to resist the weather, is to study the actual effects of the atmosphere upon it, as exhibited in buildings which for years have been exposed to these influences. Unfortunately, however, in this country, but few opportunities for applying this test are to be found. It is true some analogous information may be derived from the examination of the exposed surfaces of marble in their out-crops at the...