1747, French engineer Franois Fraineau made the world's earliest raincoat. He used latex obtained from rubber wood to dip cloth shoes and jackets in this latex solution, which can play a waterproof role. McIntosh, who works in a rubber factory in Scotland, can't afford rain gear because he lives in poverty. Every rainy day, he can only go to work in the rain. One day, he accidentally spilled rubber juice on his clothes and couldn't wipe it off, so he had to wear this dirty clothes to go home. It was raining outside, but when McIntosh came home, he was surprised to find that his clothes were not wet at all. He just smeared rubber juice on his clothes. This is the first rubber raincoat in the world.
Traction chain
Zipper was first invented by Chicago mechanic Judson in 189 1 year. In order to relieve the trouble of tying shoelaces every day, Judson invented a zipper which can replace shoelaces. This zipper consists of a row of hooks and a row of buttonholes. Pull an iron slider from bottom to top, and the hook and buttonhole can be fastened one by one. Judson sent the sample to Columbia Expo on 1893, which was well received and patented. Nowadays, there are more and more kinds of zippers, and their applications are not limited to daily necessities, but also into scientific research, medical care, military and other fields, and they are praised by some people as one of the great civilizations in the field of science and technology in the 20th century.