Stationary Transformers - Theory, Connections, Operation and Testing of Constant-Potential, Constant-Current, Series and Auto Transformers, Potential Regulators, Etc #264767

The development of the alternating-current transformer dates back about 25 years. At that time very little was known regarding design for Operation at high voltages, and the engineer of the present day can scarcely realize the difficulties encountered in the construction of the early trans formers.