What material did Thomas Edison select for the light bulb filament in October 1879?
Answer
Carbonized cotton thread
After exhaustive testing of many organic materials, the team settled on carbonized cotton thread to serve as the filament. This material proved durable enough to burn for many hours, which was a critical step in making the incandescent light bulb a viable replacement for gas lighting. This development allowed the light bulb to transition from a laboratory experiment into a functional, long-lasting device capable of sustained illumination.
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