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Ball-strain insulator, ca. 1920

Contributed by Maine Historical Society

Ball-strain insulator, ca. 1920

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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.

Other Information


  • 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 Co.
  • Object Type: Physical Object

For more information about this item, contact:

Maine Historical Society
489 Congress Street, Portland, ME 04101
(207) 774-1822
http://www.mainehistory.org

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LC Subject Headings

Central Maine Power Company
Electrical apparatus

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