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1933 - this insulator, of Pyrex glass, withstood a potential of 125,000 volts before flashing over

PYREX

CD 1963056 E&MP 23.009

Electric Insulating and Insulators

9/4/33

The work of the high tension laboratory includes the testing of insulators, used in high tension power transmission to determine the voltage at which the insulating properties break down. This insulator, of "Pyrex" glass, withstood a potential of 125,000 volts before "flashing over" as shown. The photograph was made at the high tension laboratory at the University of Wisconsin.

Original Caption by Science Service



National Museum of American History

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