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ca. 1948 - SPOOL PROTECTS TRANSFORMERS - developed by Westinghouse research engineers to protect transformers against their own internal electrical failures

SPOOL PROTECTS TRANSFORMERS

E&MP 40.030

Electric Transformers

ca. 1948

This is the "spool" developed by Westinghouse research engineers to protect transformers against their own internal electrical failures.

The spool, made of porcelain, is wound with copper wire and coated with zinc oxide.

Photo ## 256543

also see 040.025


Original Caption by Science Service



National Museum of American History

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