The Bulb dēngpào (English Bulb) was first used by Henry Goebbels of the United States. The most famous inventor is American scientist Thomas Alva Edison. It is well known that Edison succeeded in trial-producing the light bulb on October 21st, 1879.
in the process of development, Thomas Alva Edison carefully analyzed the gas lamp and arc lamp at that time, and his main direction was to find a heat-resistant material. It is burned to a white-hot level by electric current and emits hot light without breaking or melting. He happened to find that cotton thread suddenly burned to ashes in the air, while carbon cotton thread glowed when it was put into a treated glass ball. Unfortunately, the light only lasted for a few minutes and then disappeared. He mistakenly gave up this experiment and tried 1,6 different heat-resistant materials, such as cesium, nickel, platinum (platinum) and platinum-iridium alloy, with little gain.
Thomas Alva Thomas Alva Edison returned to the study of carbon. In October that year, he tested a carbon rod with a length of 2 cm and a diameter of .15 cm, and its heat resistance reached 5.5 hours. He constantly improved the carbonization method and pumping treatment.
on October 21, 1879, he used a carbonized cotton thread with a diameter of .25 cm as a filament, and its luminosity was bright and stable. It was bright for 45 hours with an illumination of 4 candlelight, 1 hour, 2 hours .... After more than a year's efforts and thousands of experiments, the long-awaited electric light was finally born.
In October of the same year, after Thomas Alva Edison changed to carbonized cardboard to greatly improve the life of electric lamps, the manufacturers couldn't wait to put it into production. On New Year's Eve in 188, 3, people took to the streets of new york to watch this new invention. Success did not stop Thomas Alva Edison. The next year, he made a bamboo filament lamp that could be lit continuously for 1,2 hours. It was not until 194 that the Austrian invented the tungsten lamp, which was three times stronger than the bamboo filament lamp, that the former was replaced. Tungsten lamp has been in use since 197.
Before the invention of the light bulb, it was a laborious and dangerous thing to light a place after sunset. It was necessary to use candles or torches to light it. Although the oil lamp at that time was not bad, it always left soot.
In the mid-18th century, electrical science really developed. At that time, inventors everywhere clamored to invent a practical home lighting device. British inventor Swan and American inventor Edison invented the electric light bulb in 1897. There is no essential change between the modern electric light bulb and the electric light bulb invented by Edison that year, but there are more parts.
It is generally believed that the electric light was invented by Thomas Edison, an American. However, if we make a careful textual research, another American, Henry goebbels, has invented a reliable electric light bulb with the same principle and materials decades earlier than Edison, and many others have made many contributions to the invention of electric light before Edison.
in p>181, British chemist David electrified platinum wire to glow.
in p>181, David invented the electric candle, which was illuminated by an arc between two carbon rods.
in p>1854, Henry Goebbels used a carbonized bamboo filament and put it under a vacuum glass bottle to make it glow. His invention today seems to be the first incandescent lamp with practical utility. The light bulb he tested at that time could last for 4 hours, but he did not apply for a design patent immediately.
in p>185, Joseph Wilson Swan, an Englishman, began to study electric lights.
In p>1878, Joseph Wilson Swan obtained a British patent for a light bulb powered by carbon wires under vacuum, and began to set up a company in Britain to install electric lights in every home.
in p>1874, two electrical technicians in Canada applied for a patent for electric light. They filled the glass bulb with nitrogen, and the electrified carbon rod made it glow. But they didn't have enough money to continue developing this invention, and sold the patent to Thomas Edison in 1875.
in p>1879, Edison changed to carbon filament to make light bulbs, which lasted for 13 hours successfully.
In p>188, Edison's carbonized bamboo filament light bulb was successfully maintained in the laboratory for 12 hours. But in Britain, Swan sued Edison for patent infringement and won the case. Edison's electric light company in England was forced to make Swan a partner. But later Swan sold his rights and patents to Edison. In the United States, Edison's patent was also challenged. The United States Patent Office once ruled that his invention had a criminal record and was invalid. Finally, after years of lawsuits, Edison got the patent right of carbon filament incandescent lamp.
In p>196, General Electric invented a method for manufacturing tungsten filament for electric lamps. Finally, the method of manufacturing tungsten filament cheaply was solved, and tungsten filament light bulbs have been used so far.
In p>191, the Cooley Hall in the United States used tungsten wire as the filament and invented the tungsten light bulb.
in p>1913, Langmuir of the United States filled the glass bulb with gas to prevent the filament from evaporating, and invented the gas-filled tungsten filament bulb.
in p>1925, Japan's Bubu Tangsan invented the inner wall frosted light bulb.
in p>1932, Shunichi Miura of Japan invented the double helix tungsten filament bulb.
The use of light bulbs makes the world more colorful and dazzling.