Item 74825 - Electrical insulator, ca. 1930
- Item 74825 - Electrical insulator, ca. 1930
- Contributed by Maine Historical Society
- Item 74825
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Image Info This insulator is coated with a composite material containing particles of mica, a mineral also used to insulate early toaster elements, fuses, and switches.
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Electrical insulators keep electrical current from "leaking" out of wires.