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This paper describes the recent trend in design of large water-wheel driven generators. New features of mechanical construction made possible by fabricated designs are particularly emphasized, and illustrations of some recent machines are given. The 77,500-kv-a. generators for the Dnieprostroy project in Russia, which will be the world's largest hydroelectric generators, are described. In conclusion, some of the future possibilities, such as outdoor machines and multi-speed designs, are discussed.