Model (scale 1:4) of Rateau Steam turbine for 600 K.W. dynamo. Base

Model (scale 1:4) of Rateau Steam turbine for 600 K.W. dynamo. Base, bedplate and blades made and fixed in ScM. Also:- 1 segment of guide blades (scale 1:4) made in ScM.; 2 specimens showing manufacture of 2 1/2 " blade (fullsize); 2 specimens showing manufacture of 1" blade (fullsize); and 2 specimens showing manufacture of 3/4" guide vane (fullsize)

Made from drawings supplied by Messrs. Fraser and Chalmers, Ltd., 1908. This model, which is partly sectioned, represents a steam turbine of the form patented by Prof. A. C. E. Rateau in 1896, and subsequently developed. It is arranged for direct connection with a dynamo having an output of 600 k.w. The turbine is of the compound or multi-stage impulse type, and consists of 14 simple turbines arranged in series in separate chambers, and with a common shaft. Each stage has a set of nozzles, in which the steam is expanded through a fraction of the total pressure drop, and a wheel which absorbs the kinetic energy thus generated; the steam enters at the high-pressure end of the series and passes successively through all the stages to the condenser. The steam velocity ranges from about 750 ft. per sec. at the first wheel to about 1,100 ft. per sec. at the last.