. American engineer and railroad journal . tcan be increased to about 150,000,000 horse-power or possiblymore. Using the smaller figure of 30,000,000 horse-power as an illus-tration, to develop an equal amount of energy in our most mod-ern steam-electric plants, would require the burning of nearly .000 tons of coal per annum, and in the average steam- engine plant, as now existing, more than 600,000,000 tons of coal,or 50 per cent, in excess of the total coal production of the coun-try in 1906. At an average price of $3 per ton it would requirethe consumption of coal costing $1,800,000,0
. American engineer and railroad journal . tcan be increased to about 150,000,000 horse-power or possiblymore. Using the smaller figure of 30,000,000 horse-power as an illus-tration, to develop an equal amount of energy in our most mod-ern steam-electric plants, would require the burning of nearly .000 tons of coal per annum, and in the average steam- engine plant, as now existing, more than 600,000,000 tons of coal,or 50 per cent, in excess of the total coal production of the coun-try in 1906. At an average price of $3 per ton it would requirethe consumption of coal costing $1,800,000,000 to produce anequivalent power in. steam plants of the present general type. Using the data furnished by the census returns of 1900, 1902and 1905 as a basis and applying the prevailing rate of increasein the industries included in these reports, and adding an equiva-lent amount for the steam railroads, it is estimated that the totalinstalled capacity of prime movers in all our land industries for1908 approximates 30,000,000 FRONT VIEW OF STEAM MOTOR TRUCK. The average load on steam and other engines is much less thantheir rated capacity and, owing to the overlapping of loads, it isprobable that the total average load does not exceed one-thirdor one-quarter of this amount.—H. St. Clair Putnam in an Ad-dress before the Conference on the Conservation of NaturalResources. I ^^^== The Largest Belt.—What is believed to be the largest beltin the world was recently installed in the Dempster sawmill atTacoma, Wash. The hides of 225 steers were needed for mak-ing it. Only the centers of the hides were used and each ofthese was stretched for weeks to insure uniform strength in allparts of the proposed belt. The belt is 114 feet long, J5 feetwide and three-ply thick and weighs something over 2,500 best quality of cement was used and the places where thehides overlap welded by the weight of a hydraulic press bearing250 pounds pressure to the square foot.—Pow
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
