U.S. Government Printing Office, 1916 - 74 σελίδες

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A A thin section from the same foot of coal as that shown
A Thin vertical section of coal from the Experimental
A Vascular strand embedded in attritus coal from
A Thin horizontal section X 1000 of coal from
A Typical cross section of attritus of coal from Carbon
A Thin vertical section of Zeigler coal showing strips
A Thin vertical layer of Zeigler coal representing a layer
A Thin vertical section of anthraxylous material in coal
A Thin cross section of the bright coal or anthraxylon
A Cuticle from the Illinois coal X 100 B Sporeexine
A Three megasporeexines isolated from coal from Shelby
Horizontal cleavage surface of anthraxylon X 5 245
Sporeexines in coal from Buxton Iowa 256
Spores partly covered with ramenta in the Illinois coals 259
A Part of the section shown in Plate CXXXVIII
A Thin horizontal section of landalia coal cut obliquely
A Cross section of the stem of a fossil medullosa x
A Medullosalike structure in coal from Shelbyville
A A section of coal from the Experimental mine showing
Publications on the composition of coal 291
mine X 1000 290
Essential data in regard to coal contracts_
Essential data in regard to coal contracts Continued Page
Virginia coals
West Virginia and Virginia coals 98
Calculated steam and water requirements for an absorption plant
Application of absorption process to gas from oil wells producing from a sand

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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 99 - 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...