History of Electric Bulb
The Electric light is one of the most common everyday conveniences which were owned in a traditional sense in 1879 by Thomas Alva Edison, although he could create the most practical incandescent light bulb. They are not the only ones trying to make incandescent bulbs. In fact, some historians say there are 20 inventors of the incandescent lamp before the Edison version. However, Edison is often credited with the invention because it may be more than the previous version due to a combination of three factors: an effective incandescent material, a higher vacuum than any other one can achieve and the high resistance that contributes to the distribution of power from centralized sources of importance.
Early Yellow Lights
In 1802, Humphry Davy discovered the first electric lamp. He experiments with electricity and finds an electric battery. When connecting wires to batteries and carbon dioxide, the carbon will fire, producing light. The discovery is known as the Electric Arc Lamp. And when the light is produced, it does not work for long and very practical use.
For the next seventies, other inventors also created “bulbs” but no designs for commercial applications. In addition, in 1840, British scientist Warren de la Rue surrounded the platinum filament mounted on the vacuum tube and passed through the electric current over. The design is based on the concept that a high melting point on platinum will allow it to operate at higher temperatures and the evacuation chamber will contain smaller gas molecules for reaction with platinum, promoting long life. Despite the efficient design, platinum costs are not practical for commercial production.
In 1850, a British physicist named Joseph Wilson Swan created a “bulb light” covering the carbonized paper filament on the evacuated glass hole. And in 1860 he had a working prototype, but good vacuum power and adequate power supply to produce very short light to be regarded as an effective light producer. However, a better vacuum pump in 1870 was available and Swan continued to experiment in the light. In 1878, Swan developed a heat-resistant light hole using the treated cotton yarn also eliminated the problem of early exposure to the bulb.
On July 24, 1874, a Canadian patent was filed by a Toronto medical electrician named Henry Woodward and fellow Mathew Evans. They make different sizes and carbon rods held between electrodes in glass cylinders filled with nitrogen. Woodward and Evans tried to export the lights but did not succeed. Finally, patents were sold to Edison in 1879.
A great scientist of his time Thomas Edison in 1878 began to seriously research and develop practical incandescent lamps. On October 14, 1878, Edison submitted his first patent application for “lighting renovation”. However, he continued to try to test some types of metal filaments for their original designs. On November 4, 1879,
he filed another US patent for electric light using “a carbon filament or strip stripped and connected to a contact cable platinum.”
Although the patent states several ways to make carbon filament “cotton yarns, yarns, woods, papers,” not many months after the patent was granted, Edison and his team found the filament steel could last more than 1200 hours.
This discovery marked the start of the production of commercial light bulbs and in 1880, the company of Thomas Edison, Edison Electric Light Company downloaded new product marketing.