140 years ago, Edison did his first electric light bulb experiment

The lamp lit for 40 hours, marking Edison's first successful electric lamp experiment after thousands of failures in laboratory tests in Menlo Park, New Jersey.

The key to success was the use of a thin, hair - size carbon filter that was lit up but did not melt by the heat produced by electricity.

He declared before the lab employees: “If I could make it shine in 40 hours, I can make it shine in 100 hours. ”

Based on this lamp, Edison began working on the construction of the first successful lighting system, which would eventually power 85 houses his company had equipped with electric circuits and lighting lamps in New York City.