On December 18, 1878, Swan successfully produced the first incandescent bubble. Shortly thereafter, he showed his carbon filament bulb at the Newcastle Chemical Association. And when his experimental report on incandescent lamps was published in the United States, he also gave Edison direct help. Unlike Edison, after inventing incandescent lights, Swan did not apply for patents until 1880; it was not officially put into production until 1881. After the bulb was put into production, he failed to establish the corresponding power station and transmission grid like Edison. This made Edison come to the fore and became the inventor of the incandescent electric lamp.
In the process of Edison's development of incandescent bulb filament materials, cotton threads, thin strips of wood, straw, gauze, thread, Manila twine, stirrup, fishing line, chestnut, hard rubber, cork, rattan, and jade fiber were tested. Even human beards and hair.
On the evening of October 21, 1879, Edison and his assistants successfully loaded the carbon filament into the light bulb. A German-born glass expert, according to Edison’s instructions, pumped the air in the bulb to a millionth of an atmosphere, sealed it, and Edison turned on the current. Their day and night hopes finally came to the fore: The light bulb emits a golden light! After 45 hours of continuous use, the filament of this electric lamp was blown, which is the first electric lamp with universal practical value. Later, people set this day as the day of the invention of electric lights. After that, Edison has been working on the improvement of incandescent lamps. In order to improve the quality of the bulbs and extend the life of the bulbs, Edison tried every means to find the materials suitable for the filaments. By the beginning of May 1880, he had tested about 6,000 plant fiber materials. For a long time, Edison sent many people around the world to find bamboo suitable for making filaments. Until the 9th year of 1908, Japanese bamboo has been the main raw material for the supply of carbon wire.
The incandescent bulb invented by Edison has made tremendous contributions to human civilization, but in order to save energy and protect the environment, it can only be taken out of the historical stage!
Incandescent lamps have the advantage that most other types of illuminating products do not have the advantage of being suitable for frequent start-ups.
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