The history of lighting

The history of lighting Edison invented many things in the life of the great inventor. However, the only thing that can immediately get a warm welcome is the electric light. Because the benefits of electric lights are visible and tangible. Its appearance means that people have another round of the sun, and people's activities are no longer restricted by night objects.　　 Edison 　　 In 1999, British scientists David and Faraday invented an electric light called the arc lamp. This kind of electric lamp uses a carbon rod as the filament. Although it can emit bright light, the light is dazzling, the power consumption is large, and the life span is not long, so it is not practical.　　 'The arc lamp is not practical. I must invent a soft-lit electric lamp so that thousands of households can use it.' Edison secretly made up his mind.　　 He started experimenting as a filament material: using traditional carbon strips as the filament, the filament broke as soon as it was energized. Use metals such as ruthenium, chromium, etc. as the filament, which will be burnt after being turned on for a while. The effect of using platinum wire as the filament is not ideal. In this way, Edison experimented with a variety of materials. After repeated trials and repeated failures, many experts believe that the future of electric lights is bleak.　　Edison 　　 In the face of failure and the cynicism of some people, Edison did not retreat. He understands that every failure means another step towards success.　　 Once, Edison's old friend McKenzie came to visit him. Edison looked at McKenzie's long beard that dangled when he was talking, and suddenly his eyes lit up and said, 'Beard, sir, I want to use your beard.' McKenzie cut a lock and gave it to Edison. Edison confidently selected a few thick beards, charred them, and then installed them in the bulb. Regrettably, the test results are not ideal. 'Then try it with my hair, maybe it's okay,' McKenzie said.　　 Edison was deeply moved by the spirit of his old friend, but he understood that hair is the same in nature as beard, so he did not adopt the old man’s opinion. Edison walked away, ready to see off the kind old man. He intentionally helped the old man to flatten the cotton jacket he was wearing. Suddenly, he shouted again: 'Cotton thread, why not try cotton thread?' McKenzie unhesitatingly untied his jacket, tore off a piece of cloth woven with cotton thread, and handed it to Edison. Edison put the cotton thread in a U-shaped airtight crucible and treated it at high temperature. Edison clamped the carbonized cotton thread with tweezers. Prepare to install it in the bulb. But because the carbonized cotton thread was thin and brittle, and Edison was too nervous, the hand holding the tweezers trembled slightly, so the cotton thread was pinched. * After a lot of effort, Edison put a charcoal cotton thread into the light bulb.　　 As night fell, Edison's assistant evacuated the air from the bulb and installed the bulb on the socket. Everything was ready, and everyone quietly waited for the result. When the power is turned on, the light bulb emits a golden glow, illuminating the entire laboratory. After months of hard work, I tried a variety of materials and tried many times, and finally made a breakthrough. The history of lighting　　 But how long will the light be on?　　Hour, hour, hour... This electric light was on for a full hour before the filament was burned out. This is an electric lamp with practical value for human beings. This **-year, month and day, was later designated as the day of the invention of the electric light.　　 'Hours are still too short, and its life span must be extended to hundreds or even thousands of hours.' Edison did not revel in the joy of success, but set higher requirements for himself.　　**, the weather is sultry, he took the bamboo fan on the table, fanning it, and thinking about the problem. 'Perhaps Qianbian bamboo silk will be more effective after charring.' Edison wanted to try everything he saw. The test results show that the effect of using bamboo filament as the filament is good, the filament is durable, and the bulb can be bright for hours.　　 After further experimentation, Eddie** currently uses carbonized Japanese bamboo silk as the filament for the best effect. First, he began mass production of electric lights. He installed the first batch of bulbs produced on the 'Ganet' expedition ship, so that the investigators had more working time. Electric lights began to carry ordinary people's homes.　　 People have always used this kind of light bulb with bamboo filament as the filament. Decades later, it was improved again, that is, using tungsten filament as the filament, and filling the bulb with inert gas nitrogen or argon. In this way, the life of the bulb has been extended a lot. This is this kind of bulb we are using now. The history of lighting