Edison invented the light bulb,

Edison and his assistants tried platinum several times, but this kind of platinum with high melting point prolonged the light-emitting time of the electric lamp a lot, but it was still not ideal to automatically extinguish and then emit light from time to time.

Undaunted, Edison continued his experimental work. He has tried rare metals such as barium, titanium and indium, and the results are not very satisfactory.

Next, he and his assistants began to test 1600 kinds of heat-resistant materials, and platinum was the most suitable one. Due to the improved air extraction method, the glass bubble is vacuum. The life of the lamp has been extended to two hours. But this kind of platinum lamp is too expensive. Who wants to spend so much money on a light that can only last for two hours?

Edison saw this scarf made of cotton yarn, and an idea suddenly appeared in Edison's mind:

Yes! Cotton yarn has better fibers than wood. Can you use this material?

He quickly tore off a cotton yarn from his scarf and carefully put this carbon filament into the glass bubble, which really worked well.

Edison was very happy. He made many carbon filaments made of cotton yarn and did many experiments. The life of the light bulb was extended by 13 hours, and then it reached 45 hours.

"I hope it can open 1000 hours, preferably 16000 hours!" Edison said.

Finally, Edison finally chose bamboo. He first took out a bamboo and put it in a glass bulb. After electrifying, the bamboo filament bulb lit continuously 1200 hours!

He finally made the electric light he was satisfied with.