The Light Bulb

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The Light Bulb

Post  laraschembrisant on Thu Mar 06, 2014 1:10 pm

In 1802, Humphry Davy invented the first electric light. He experimented with electricity and invented an electric battery. When he connected wires to his battery and a piece of carbon, the carbon glowed, producing light. His invention was known as the Electric Arc lamp. And while it produced light, it didn’t produce it for long and was much too bright for practical use. On July 24, 1874 a Canadian patent was filed by a Toronto medical electrician named Henry Woodward and a colleague Mathew Evans. They built their lamps with different sizes and shapes of carbon rods held between electrodes in glass cylinders filled with nitrogen. Woodward and Evans attempted to commercialize their lamp, but were unsuccessful. They eventually sold their patent to Edison in 1879. The electric light, one of the everyday conveniences that most affects our lives, was not “invented” in the traditional sense in 1879 by Thomas Alva Edison, although he could be said to have created the first commercially practical incandescent light. He was neither the first nor the only person trying to invent an incandescent light bulb. In fact, some historians claim there were over 20 inventors of incandescent lamps prior to Edison’s version. However, Edison is often credited with the invention because his version was able to outstrip the earlier versions because of a combination of three factors: an effective incandescent material, a higher vacuum than others were able to achieve and a high resistance that made power distribution from a centralized source economically viable.

In 1878, Thomas Edison began serious research into developing a practical incandescent lamp and on October 14, 1878, Edison filed his first patent application for "Improvement In Electric Lights". However, he continued to test several types of material for metal filaments to improve upon his original design and by Nov 4, 1879, he filed another U.S. patent for an electric lamp using "a carbon filament or strip coiled and connected ... to platina contact wires." his team discovered that a carbonized bamboo filament could last over 1200 hours. This discovery marked the beginning of commerically manufactured light bulbs and in 1880, Thomas Edison’s company, Edison Electric Light Company begain marketing its new product. A light bulb has three main parts: a metal base that conducts electricity, a thin wire called a filament and a glass bulb that surrounds and protects the filament.

http://energy.gov/articles/history-light-bulb

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Re: The Light Bulb

Post  Dominique on Fri Mar 28, 2014 1:16 pm

Great job, Lara! It's hard to imagine a world without artificial light. It's amazing to see the inventions that people come up with to make life easier for everybody. Imagine having to spend your nights with a mere candle flickering in the corner, just enough to see where you're going. The lightbulb was probably one of the most useful inventions made that will never in a long time become unuseful.
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