Bulletin, Τεύχη 115-120U.S. Government Printing Office, 1916 |
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Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
1,000 men employed accidents anthracite anthraxylon chips anthraxylon components anthraxylon strips attritus bituminous coal BULLETIN 117 PLATE BUREAU OF MINES Buxton coal Carbon Hill carbonaceous carbonaceous matter cars and loco cell structure cent coal beds coal fields COAL MINES County cuticles dull coal dust explosions Electricity shock exines falling down shafts Falls of face Falls of roof fatality rate gas and dust gross sample HORIZONTAL CLEAVAGE SURFACE humic matter injuries inspector Iowa Killed in shaft lamina layer magnification MINES BULLETIN 117 Mining machines moisture negligence Number killed NUMBER OF HOURS operator peat Pennsylvania percentage pillar coal Pittsburgh coal ployed reports represent resinous resinous matter SECTION OF COAL SECTION SHOWN Sesser shafts or slopes Shelbyville shock or burns short tons showing shown in Plate sporangium spore spore-exines Suffocation TABLE thin cross section thin horizontal section THIN VERTICAL SECTION tissue tons total number U. S. Geol Vandalia Vandalia coal West Virginia woody
Δημοφιλή αποσπάσματα
Σελίδα ii - The Bureau of Mines, in carrying out one of the provisions of its organic act — to disseminate information concerning investigations made — prints a limited free edition of each of its publications. When this edition is exhausted, copies may be obtained at cost price only through the Superintendent of Documents, Government Printing Office, Washington, DC The Superintendent of Documents is not an official of the Bureau of Mines.
Σελίδα 45 - It overcomes the attractive forces that tend to hold the molecules of a substance together, and thus changes it from a solid to a liquid or from a liquid to a gas, according to the state it was in when the heat was applied.
Σελίδα 49 - ... or more shall be collected. The gross sample should contain the same proportion of lump coal, fine coal, and impurities as is contained in the coal sampled. When coal is extremely lumpy, it is best to break a proportional amount of the lumps before taking the various increments of a sample.
Σελίδα 22 - V) by depositing each shovelful of coal on top of the preceding one, and then formed into a long pile in the following manner : The sampler shall take a shovelful of coal from the conical pile and spread it out in a straight line (Figs.
Σελίδα 49 - MOISTURE. 1. The coal shall be sampled when it is being loaded into or unloaded from railroad cars, ships, barges, or wagons, or when discharged from supply bins, or from industrial railway cars, or grab buckets, or from any coal-conveying equipment, as the case may be. If the coal is crushed as received, samples usually can be taken advantageously after the coal has passed through the crusher. Samples collected from the surface of coal in piles or bins, or in cars, ships or barges are generally...
Σελίδα 49 - ... increments. For slack or small sizes of anthracite, increments as small as 5 to 10 pounds may be taken, but for run-of-mine or lump coal, increments should be at least 10 to 30 pounds.
Σελίδα 69 - Mining and treatment of feldspar and kaolin in the southern Appalachian region, by AS Watts. 1913. 170 pp., 16 pis., 12 figs. BULLETIN 56.
Σελίδα 69 - BULLETIN 17. A primer on explosives for coal miners, by CE Munroe and Clarence Hall. 61 pp., 10 pis., 12 figs. Reprint of United States Geological Survey Bulletin 423. BULLETIN 20. The explosibility of coal dust, by GS Rice, with chapters by JCW Frazer, Axel Larsen, Frank Haas, and Carl Scholz. 204 pp., 14 pis., 28 figs.
Σελίδα 97 - BULLETIN 116. Methods of sampling delivered coal, and specifications for the purchase of coal for the Government, by GS Pope.
Σελίδα 49 - ... analysis is in error, another analysis can easily be made of the original sample. Gross samples of the quantities designated herein must be taken whether the coal to be sampled consists of a few tons or several hundred tons, because of the following cardinal principle in sampling coal that must be recognized and understood; that is, the effect of the chance inclusion or exclusion of too many or too few pieces of slate or other Impurities in what, or from what, would otherwise have been a representative...