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Uploaded on Dec 1, 2010
De La Rue's BulbIn 1840 astronomer Warren De la Rue enclosed a platinum coil in a vacuum tube and passed an electric current through it. Thus he created the world's first light bulb. The design was based on the concept that the high melting point of platinum would allow it to operate at high temperatures and that the evacuated chamber would contain fewer gas molecules to react with the platinum, improving its longevity. The first glow bulb resembled a piece of jewelry or a work of art both in terms of labor content and its cost. Although it had an efficient design, the cost of the platinum made it impractical for commercial use. This bulb served as a prototype for filament bulbs. And its creator worked over the electrical discharge through gases in 1860s. Thus, we may call him the father of two light sources.