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Ceramic power line insulators

Because electricity doesn't travel very well through glass or clay, these substances became popular for making insulators that kept power and phone lines from touching each other. Glazed ceramic insulators such as these were commonly used until the introduction of the cap-and-pin insulator made it possible to transmit much higher voltages safely.
Picture
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Museum on Main 603 Main Street Pleasanton, CA 94566   --   925.462.2766   --   www.museumonmain.org
  • Home
  • Visit/Contact
    • Hours and Directions
  • Education/Programs
    • Paint and Sip
    • Ed Kinney Series: An Evening With...
    • Charles Huff Free Historical Walking Tours
    • Harrington Free Art Walks
    • Student Programs
  • Exhibits/Collections
    • Exhibits
    • History of Pleasanton
    • Video - Museum on Main Moments
    • Collections
    • Research >
      • Newspaper Research
    • Photographs
    • Things to Donate?
  • Join/Donate
    • Donate
    • Membership
    • Volunteer
    • Living History Program
  • About
    • Mission & History
    • The Values of History
    • EDI Statement
    • Board of Directors
    • Administrative Documents
    • Contact
  • Blog