Temperatures in large alternating current generators

THE general public undoubtedly thinks of the size of a machine in terms of its physical dimensions or the work it can do. To the engineer, largeness involves the difficulties inherent in the design and construction. To him, a 5000 kv-a. generator at 3600 revs. per min. is large, while a 20,000 kv-a. generator at 100 revolutions is not large if considered strictly with reference to the temperature problem.