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Transactions | American Institute of Electrical Engineers Volume 27, pt. 1 (Inglés) Tapa blanda – 6 mar 2012


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Tapa blanda, 6 mar 2012
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ...plant, as now existing, more than 650,000,000 tons of coal, or 50%, in excess of the total coal production of the country in 1906. At an average price of $3.00 per ton it would require the consumption of coal costing $2,000,000,000 to produce an equivalent power in steam plants of the present general type. The supply of water power is limited, however, when the rapid rate of increase in our power requirements is considered, and great care, therefore, must be exercised to insure the preservation of our water power resources and to secure the maximum practicable development. "Water Powers of the Upper Mississippi and Tributaries," and "Water Powers of the Southern Appalachian System," by M. O. Leighton, Chief Hydrographer, U. S. Geological Survey. t Computed by F. G. Moorhead, in The World's Work, April 1908, p. Total power used in United States. Using the data furnished by the census returns of 1900, 1902, and 1905 as a basis and applying the prevailing rate of increase in the industries included in these reports, and adding an equivalent amount for the steam railroads, it is estimated that the total installed capacity of prime movers in all our land industries for the year 1908 approximates 30,000,000 h.p.A (Fig. 1.) The average load on steam and other engines is much less than their rated capacity, and, owing to the overlapping of loads, it is probable that the total average load does not exceed onethird or one-quarter of this amount. Rate of increase. During the last thirty years the total amount of power used in our manufactories and other industries, as recorded by the census, has doubled approximately every ten years. The fact that substantially the same rate of in The following table compiled from the latest census returns gives th...

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