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Pintype electric insulator, ca. 1916

Contributed by Maine Historical Society

Pintype electric insulator, ca. 1916

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The "pintype" insulator, with a socket in the base that screws on to a threaded wooden or metal "pin" mounted on the utility pole, was patented in 1865.

Earlier insulators were secured to the pins by various means (padding with burlap, or perhaps sticking down with tar).

Insulators keep the current in the grid and prevent it from "leaking" where it would be wasted or creating a hazard.

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Other Information

  • Title: Pintype electric insulator, ca. 1916
  • Creator: Lapp Insulator Co.
  • Creation Date: circa 1916
  • Subject Date: circa 1916
  • Media: Porcelain
  • Local Code: 2004.090.4427
  • 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

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LC Subject Headings

Central Maine Power Company
Electrical apparatus

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