Tube Time on X: "here's a light bulb that is almost 120 years old! the filament is made out of carbon, and the glass is clear because they hadn't figured out how
TIL the world's longest burning light bulb was installed in 1901 and has been glowing for over 110 years straight. It has a carbon filament that is eight times thicker than a
Carbon Filament Incandescent Lamp | Sargent Welch
Carbon filament lamp - Physics Museum - The University of Queensland, Australia