Bulb with carbon filament, ca. 1905

Purchase a reproduction of this item on VintageMaineImages.com.


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.

Please post your comment below to share with others. If you'd like to privately share a comment or correction with MMN staff, please use this form.