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1937 - 48 inch diameter of the commutator must be accurate in size within two thousandths of an inch

FREQUENCY CHANGER

E&MP16.001

Electric Circuits, Breakers

1937

GIANT EQUIPMENT - Staggering in its proportions is this large electrical frequency changer which converts electric power from Boulder Dam at 60 cycles per second to 50-cycle current used by the city of Los Angeles.

The photograph was taken while the unit was under construction in the East Pittsburgh shops of the Westinghouse Electric Co. It will soon be ready for shipment.

Westinghouse PHOTO ID #2464


Original Caption by Science Service
Westinghouse



National Museum of American History

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