First, 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.
Second, raincoats.
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.
Third, razors.
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.
Four, copy that
At first, the paraffin paper invented by Edison was only widely used as packaging materials for food and candy. Later, he tried to carve the outline of words on wax paper to form a wax carving paper tray, put white paper under the paper tray, and then rolled it out from the carved wax paper with an ink roller. A wonderful thing happened, and clear handwriting appeared on the white paper.