a website collaboration between Science Service and the Smithsonian Institution

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



Electric Circuits, Breakers


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

National Museum of American History


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