1828 sheffield made a single-sided protection blade, which is the predecessor of the safety blade. 1895, an American salesman, Gillette, happened to meet the inventor painter, hoping to make a lot of money, invent something from everything and use it once.
One day, Gillette shaved and found that the razor blade just met this idea. He designed a safe razor handle, but he couldn't find a manufacturer who could make thin blades. It was not until 190 1 that he met Carson, a mechanic, that he solved the technical problem, combined the hoe rest with the double-edged replaceable blade and applied for a patent.
As early as 1900, the electric shaver was patented in the United States, but the first electric shaver suitable for commercial manufacture was designed by retired American army colonel Hick and patented in 1928.
2. Bamboo slips
At the end of the Spring and Autumn Period, people began to use bamboo slips. People cut bamboo slips into pieces, then string them together with ropes, and then write on these bamboo boards, which becomes the original book. According to records, during the Western Han Dynasty, Dong Fangshuo wrote a letter to Emperor Wu of the Han Dynasty, using more than 3,000 pieces of bamboo slips, and it took two strong soldiers to lift it barely. It took Emperor Wu of the Han Dynasty two months to finish reading this letter.
Step 3: raincoat
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.
4. El Dixon invented the band-aid.
Eldik Sen, an employee of Johnson & Johnson, just married his wife, Josephine Knight. The couple are very loving. Mrs Dixon likes to prepare food for her beloved husband, but she is all thumbs and often hurts herself. After the wound is bandaged, it can't be fixed well. If you are not careful, the bandage will come off by itself.
The power of love inspired Eldik Sen: He began to try to put gauze in the middle of each bandage. In this way, when the wife is injured again, the wound can be quickly bandaged with this bandage, which is not easy to fall off, and the wound can be quickly treated in less than 30 seconds.
5, the invention of the chair
Legend has it that in the ancient Han Dynasty, there was a loving couple in Lanyangcheng. The husband is studying late at night, and the lover always hugs him quietly behind his back. He got used to being so warm and invented the chair!
According to documents, chairs in ancient China appeared in the period of Emperor Ling of Han Dynasty (168- 189), formerly known as Hu Bed or Mazha Hu Bed, and were widely used from Wei, Jin, Southern and Northern Dynasties to Sui and Tang Dynasties. Rich and powerful people not only have to live in their own rooms, but also have a temporary rest with attendants when they go out.