The invention of the light bulb
Before the light bulb people used lamps, Lamps, candles, and torches. The lamps had used lamp oil. Lamp oil usually burns paraffin; paraffin is petroleum that comes from oil wells. Before 1859 lamps were made out of animals. They usually would squeeze the oil from the nuts or seeds in the plant.
Now days the world is lit up by electric lights, made out of light bulbs. Light bulbs help light up the world without having to use dangerous fires. The inventor of the amazing light bulb was Thomas Edison in 1879. Thomas Edison was not the only scientist trying to invent the light bulb, but he ended up becoming the inventor. The first light bulb was made of carbon and other things, but now days the light bulb is powered by tungsten.
Tungsten is a hard steel-gray metal of the transition series that is very good at melting. Carbon is carbon. The function of the light bulb is to replace a lamp and to be safer. So the gas lighting had become famous. Many people had used gas lighting after the invention of the light bulb.
So the light bulb is a housed filament household in a glass vacuum bulb. Edison was looking for a small electric light that used less electricity for home uses. Edison had tried many other materials for the light bulb to burn longer, he was thinking of using tungsten but at the time he did not have the correct tools to do it. Although Thomas had gotten carbonized cotton thread to work it only lasted for 15 hours.
By 1880 the 16 watt bulb was made and has lasted for 1500 hours. Then they put the bulbs in the market. In 1910 William David invented the improved method of the tungsten filament that had outlasted any other type of filament used for a light bulb that helped make the price of the bulb reasonable at the time.
http://www.ideafinder.com/history/inventions/lightbulb.htm
http://www.barrygray.pwp.blueyonder.co.uk/Egypt/Lighting.html
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