Bulletin (Google eBook)

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The Survey, 1915 - Peat - 274 pages
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Page 233 - European countries to look more and more to the United States for their coal supply. Therefore, while our present coal production and consumption are practically equivalent, the export of coal, unless prohibited by federal legislation, must eventually become a factor and increase the coal production in the United States beyond the demands of home consumption. On the other hand, powerful influences will come to bear upon coal production, which favor lengthening the life of the supply. Thus it is to...
Page 232 - America leads the world not only in present production of coal, but also apparently possesses the greatest reserve and certainly is mining coal at much lower cost than any other country, the obvious tendency will be for European countries to look more and more to the United States for their coal supply. Therefore, while our present coal production and consumption are practically equivalent, the export of coal, unless prohibited by federal legislation, must eventually become a factor and increase...
Page 21 - C,'. or British thermal units, " BTU" A calorie is the amount of heat necessary to raise one gram of water one degree centigrade, the British thermal unit is the amount of heat necessary to raise one pound of water one degree Fahrenheit.
Page 23 - ... For further comparisons of various fuels see "Gas and Fuel Analysis for Engineers," by AH Gill, Chapter VII. *Spangler, Green and Marshall. "Elements of Engineering," p. 4. The combustible contents of several fuels compare as follows: TABLE 7. Percentages of Combustible Contents of Fuels.* tBased on the results of the Wisconsin Peat Survey in 1903 *Babcock and Wilcox Boiler Co., "Steam." p. 52. See Chapter VII. Fuel Fixed Carbon Per Cent of Combustible Volatile Matter Per Cent of Combustible...
Page 232 - DURATION OF SUPPLY. The total reserve of easily accessible and now available coal is estimated at 1,382,780,000,000 tons. The assumption that a constant output has been reached would be utterly unwarranted. On the other hand, the adoption of the flat rate of annual increase of 7.36 per cent would involve the improbable assumption that the marvelous record of the past and present will be maintained in the future and the production would continue to approximately double every decade.
Page 2 - A bog is an area of wet, porous land, on which the soil is made up principally of decayed and decaying vegetable matter, so loosely consolidated, and containing so much water, that the surface shakes and trembles as one walks over it. The vege*Davis.
Page 233 - The principal loss or waste attending coal-mining operations is that represented by the quantity of coal necessarily left in the ground as pillars to support the roof. In some cases it is also necessary to leave a foot...
Page 232 - On the other hand, the adoption of the flat rate of annual increase of 7.36 per centf would involve the improbable assumption that the marvelous record of the past and present will be maintained in the future and the production would continue to approximately double every decade. Using the waste allowance, on the basis of this constant rate of increase in production, the...

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