Among the stories we know about Edison, Edison is undoubtedly the king of invention. He only went to school for three months, but he has more than 2000 inventions, 1500 patents. One of his most famous patents should be his light bulb. In the story we know, Edison tried more than 6,000 kinds of materials and made more than 7,000 experiments in order to find materials that can make light and electricity glow. This spirit undoubtedly touches everyone, but in fact, the light bulb was not invented by Edison himself. The original founder of the invention of the light bulb should be joseph swan in Britain. Before Edison was born, he began to study electric lights. He used carbon instead of platinum wire, baked many pieces of cardboard into carbon resistors, and evacuated the air in the glass cover. Then he found that the carbon filament appeared bright, and this was the earliest electric light. In the year when Swan invented the electric light, Edison.
There is no doubt that Swan has made a breakthrough in the electric light, but he has never been able to break through the bottleneck of the length of the electric light, so he has to give up the experiment. Fifteen years later, the vacuum pumping technology was improved and the DC motor was made, which made him see hope again, so he began to study electric lamps again, but because he still used carbonized filaments, his experiment was never successful.
Later, Edison realized the prospect of incandescent lamps, and immediately funded scientists to set up an electric lamp company, and declared in the newspaper that all the problems of electric lamps had been solved. Swan also publicly condemned Edison on this matter, but fortunately, the patent of incandescent lamp was still owned by Swan, and Edison didn't get it until six years after his appeal.