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Glassy wonder that gave us bright nights

As the night descends the city is engulfed nto darkness. Most of the people go to sleep. A few, who have some important work, use a candle or a lantern. Yes, this was the routine of the people all over the world till the 18th century.It was Thomas Alva Edison, an American scientist, who changed this scenario. In his time, only big offices or showrooms used electric arcs for lighting purposes. The electric bulbs were used rarely, as they did not last long. Edison developed the Incandescent Electric Bulb in 1879. Incandescent literally means-something that emits light as a result of heating. Edison used a very fine filament of carbon and enclosed it in an oxygen free glass bulb to prevent the carbon from burning. When the current was passed through the filament it glowed but didn’t burn due to lack of oxygen. This was the first bulb to glow for more than 13 hours. Edison invented many other electrical devices. In 1882, he opened the first electric power plant in New York City.  Thus he was responsible for the development of the electric lighting system, as we know it today. The bulbs we use nowadays have a tungsten filament that was invented in 1910. It is a reliable and long lasting source of light.

 
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