Ball-strain insulator, ca. 1920
Contributed by Maine Historical Society
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Nicknamed the "Johnny Ball," this insulator is made of a composite material containing asphalt, shellac and asbestos.
Strain insulators are used in the guy wires supporting utility poles or radio antennas to break the electrical path and prevent short circuits or grounding.
- Title: Ball-strain insulator, ca. 1920
- Creation Date: circa 1920
- Subject Date: circa 1920
- Media: Composite material, iron
- Local Code: 2004.090.4435
- Collection: Central Maine Power Company collection
- Object Type: Physical Object
For more information about this item, contact:
Maine Historical Society
489 Congress Street, Portland, ME 04101
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