On October 21, 1879, Thomas Alva Edison's light bulb went on

Thomas Alva Edison needed 14 months of research, an investment of 40 thousand dollars and more than 1,200 experiments to present the electric light bulb on October 21, 1879 – now 135 years old. The announcement was made in his laboratory in Menlo Park, New Jersey, where they saw the bulb radiate for the first time for 48 hours straight.

Although it is true that Edison was not the first man to create an incandescent light bulb – the English scientist Humbphrey Davy had already built a powerful electric lamp in the early 1800s – the truth is that his lamp lasted longer and required less energy, since it was made of carbonated bamboo.

The announcement of the light bulb had a great impact; First of all, because Edison was already a recognized inventor and had many benefits from his inventions, such as the telegraph, improvements to the telephone and the brand new phonograph; and second, because the development of it had been delayed more than expected: it took 14 months when they initially announced that it would not take more than four.

After the enormous reception that the news had in the media, on New Year's Eve, 3,000 people visited the laboratory in Menlo Park to witness 40 incandescent light bulbs. Edison turned them on and off, dazzling and delighting his guests. They all attended the birth of electric light.

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