The solution was a vacuum cap that sits over the whole unit, much like the glass globe surrounding the tungsten filament in a flashlight bulb.
FORBES: Pip-squeak Power Plant
Edison tried 1, 600 materials before settling on carbonized cotton fiber as the filament for his electric light bulb.
FORBES: A hail of silver bullets
An Edison bulb burns 1, 000 hours before the hammered metal filament flakes out.
FORBES: The LED Illumination Revolution
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