- Item 74874 - Bulb with carbon filament, ca. 1905
- Contributed by Maine Historical Society
- Item 74874
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- *Credit line must read: Collections of Maine Historical Society
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.Show Details
This problem kept light bulb inventors and engineers working to develop more efficient filaments, which they did with the tantalum and tungsten filaments.