Museum on Main
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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
    • Corona Virus Update
    • Hours and Directions
    • Museum Store
    • Shop
  • Education/Programs
    • Ed Kinney Series: An Evening With...
    • Free Walking Tours
    • A Discussion With...
    • Student Programs
    • Scout Programs
    • Family Programs
    • Adult Programs
  • Exhibits/Collections
    • Exhibits >
      • Imagination Expressed 2023
      • Water/Ways Video Tour
      • Growing Pleasanton
      • Brickworks
      • What in the World
    • History of Pleasanton
    • Video - Museum on Main Moments
    • Collections
    • Research >
      • Newspaper Research
    • Photographs
    • Things to Donate?
  • Events
    • Ghost Walk
    • Wines & Valentines
    • Amador Centennial Reception
  • Join/Donate
    • Membership
    • Donate
    • Volunteer
    • Living History Program
  • About
    • Mission & History
    • The Values of History
    • EDI Statement
    • Board of Directors & Staff
    • Administrative Documents
    • Contact
  • Facility Rentals
  • Blog