. The street railway review . t. Feb. 15, 1901.] STREET RAILWAY REVIEW. 101 In a 300-k\v. turbine there are 31,073 blades, of which i6,oy5 aremoving blades. The pressure on each is from .89 to ounces. In Fig. 6 are shown economy curves developed from tests madeon a 300-k\v. turbine-generator set in operation at the Westing-house Air Brake Cos. works. The results may be summarized as follows; Boiler pressure 125lb. per sq. in. Vacuum, 26 to 27 in. Speed, 3,600 r. p. m. Steam con-sumption: .\t full load, lb. per e. h. p. h.; at three-fourths load,17 lb.; at half load, lb.; at one-
. The street railway review . t. Feb. 15, 1901.] STREET RAILWAY REVIEW. 101 In a 300-k\v. turbine there are 31,073 blades, of which i6,oy5 aremoving blades. The pressure on each is from .89 to ounces. In Fig. 6 are shown economy curves developed from tests madeon a 300-k\v. turbine-generator set in operation at the Westing-house Air Brake Cos. works. The results may be summarized as follows; Boiler pressure 125lb. per sq. in. Vacuum, 26 to 27 in. Speed, 3,600 r. p. m. Steam con-sumption: .\t full load, lb. per e. h. p. h.; at three-fourths load,17 lb.; at half load, lb.; at one-fourth load, 22 lb. per e. h. p. h. To make a comparison with a reciprocating engine and assumethe efficiency of transmission from the steam cylinders to the switchboard to be 85 per cent, which is about the very highest attainable,would bring the full load water rate on the turbine just described to14 lb. per e. h. p. h. The tests were made under ordinary condi-tions so far as dryness of steam is concerned, the boilers being. FIG. 9-3,0(X)-H. P. TURBINE. some distance away, and no allowance made for wetness of steam. Superheating may be made use of with considerable gain ineconomy and without the usual difticulties. There are no internalrubbing surfaces and no packing glands to become injured by thehigh temperature. From 60 deg. to 70 deg. of superheat improvesthe economy by some 20 per cent. Tests of the turbine power plant at the works of the Westing-house Air Brake Co. showed a coal saving of 36 per cent as com-pared with engine plant. Fig. 7 is a view of this plant. In theforeground is a lo-h. p. exciter engine and generator, and theirsize may be compared with the 500-h. p. steam turbines. The threeturbines and generators, aggregating p., together occupy afloor space of 24 ft. square. Lately a l,ooo-kw. unit has been built by C. A. Parsons & Co. forthe Elberfield Corporation, in Germany. .At , 130 lb. boilerpressure, 18 deg. F. superheat, the turbine driv
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