A little wonder, every day

Edison’s early lamps lasted hours, not thousands

Титульна AI-згенерована ілюстрація / AI-generated cover illustration. Interpretive early incandescent lamp with a glowing carbon filament, not an Edison artifact photograph.

AI-generated interpretive close-up of a fragile carbonized cotton-thread filament during early lamp experiments; not a historical photograph.

AI-generated interpretation of a later incandescent lamp using a carbonized bamboo filament; not an Edison artifact photograph.

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Титульна AI-згенерована ілюстрація / AI-generated cover illustration. Interpretive early incandescent lamp with a glowing carbon filament, not an Edison artifact photograph.

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In 1879, Thomas Edison’s team tested a lamp with a carbonized cotton-thread filament. The U.S. National Park Service says such a lamp burned for about 13.5 hours; the Department of Energy gives 14.5 hours for No. 9 thread. Later experiments with other materials lasted much longer: a bamboo filament could operate for up to 1,200 hours. So the claim of 1,500 hours does not describe the early 1879 test.