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Pony insulator, 1933

Contributed by Maine Historical Society

Pony insulator, 1933

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Alexander Graham Bell invented twisted-pair telephone wiring in 1881 by to stop interference of electrical and telephone lines on the same utility poles.

The Hemingray No. 10 "pony" insulator was developed to accommodate this new wiring system, with square grooves set close together and a thicker, sturdier construction than earlier communication insulators. The No. 10 soon became the standard communications insulator.

Other Information


  • Title: Pony insulator, 1933
  • Creator: Hemingray Glass Co.
  • Creation Date: 1933
  • Subject Date: circa 1933
  • Media: Glass
  • Local Code: 2004.090.4366
  • 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

Electrical apparatus
Central Maine Power Company

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