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Bulb with carbon filament, ca. 1905

Contributed by Maine Historical Society

Bulb with carbon filament, ca. 1905

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The inside of this lamp has a coating of carbon, the result of carbon vaporizing off of the filament, hitting the cooler sides of the bulb and depositing itself there, reducing the amount of light available from the bulb.

This problem kept light bulb inventors and engineers working to develop more efficient filaments, which they did with the tantalum and tungsten filaments.

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Other Information

  • Title: Bulb with carbon filament, ca. 1905
  • Creator: C.S. Knowles, Boston
  • Creation Date: circa 1905
  • Subject Date: circa 1905
  • Media: Glass, carbon, brass
  • Local Code: 2004.090.4237
  • Collection: Central Maine Power Company
  • 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
Light bulbs

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