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1933 - insulators are undergoing a full A.I.E.E. 60 cycle flashover test

TESTING INSULATORS, PRODUCTION, TRANSMISSION

CD 1963054 E&MP 23.007

Electric Insulating and Insulators

1933

In manufacture, porcelain insulators are subjected to a high frequency, high voltage test far in excess of normal requirements; here they are undergoing a full A.I.E.E. 60 cycle flashover test.

Original Caption by Science Service
Westinghouse



National Museum of American History

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