GIANT SPARK GAP

CD 2487095 E&MP15.014

Electric Circuits, Breakers

July 9, 1938

By adjusting the space between these two spheres, Westinghouse engineers are able to regulate as many as 750,000 volts from a transformer before they are applied to a circuit breaker under test at the East Pittsburgh works of the Westinghouse Electric & Manufacturing Company. 

Original Caption by Science Service
^©Westinghouse