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21 Oct : Bulb was ignited forever

With latest technology, you can switch on the bulb with the help of your phone. But there was a time when the bulb was lightened for the first time.

Thomas Edison devised a workable electric light at his laboratory today in 1879. It took 14 months of testing with an incandescent electric light bulb that lasted for 13½ hours. 

Edison was not the first man to create incandescent light.
oct21ln-articleinlineThe English scientist Humphrey Davy built a powerful electric lamp in the early 1800s. But Edison wanted to create a lamp that lasted longer. His invention also required less power than the earlier designs.

1879 में आज वैज्ञानिक थॉमस एल्वा एडिसन ने अपनी लैब में पहला काम करने लायक इलेक्ट्रिक बल्ब बनाया था। ये बल्ब साढ़े 13 घंटे तक जलता रहा था। बाद में इसमें और सुधार किया गया और ये मानव इतिहास के सबसे बड़े आविष्कारों में से एक साबित हुआ।

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