From Four Great Inventions of Ancient China
Gunpowder is one of China's four great inventions. Western Han Dynasty in China, there was a king called Emperor, he would like to live to be a hundred. One day, he held that all civil and military ministers, let them think of ways to their own. One is called the Lishao Jun FANG kowtow to the emperor, suggested: "If His Majesty Make eating a panacea, it will certainly be able to longevity, Immortals surpass." Emperor Han Wu a, very pleased, once believed Lishao Jun words. FANG, he ordered the whole country is in action to refining panacea for him. At that time, the main raw material for Alchemy is sulfur, saltpeter and charcoal. Alchemy of FANG who observe the day Alchemy furnace in the next, all in mind panacea. Who knows, Alchemy smelting furnace where the elixir of life has not only failed, but often the explosion occurred, some FANG even injuring themselves. What has caused this explosion? In fact, when FANG will saltpeter, sulfur and charcoal, when a certain proportion of match, inadvertently made the explosives on. Some military experts have heard the explosion of things, which have had a keen interest. They imitate the practice of FANG, the saltpeter, sulfur and charcoal, respectively, to control the proportion of 75%, 10%, 15%, made the world's first black gunpowder.
After the powder was first used in the military. Later, it was widely used in mining, mountains, roads and so on.
China's four great inventions - paper-making
Papermaking, one of China's four great inventions. Paper is used to writing, printing, painting or sheet of fiber packaging products. Generally handled by a plant fiber pulping water suspension, the combination of staggered in-line, the initial dehydration, and then by compression, by drying. People's Republic of China was the world's first country invented paper.According to archaeological findings, the Western Han Dynasty (206 BC to 8 BC), China has Ma paper fibers. Quality in the rough, and a small number of high cost, non-universal.
105 years AD, Cai Lun in the Eastern Han capital Luoyang, summing up the experience of their predecessors to improve the papermaking in order to bark, Ma Tau, rags, old fishing nets as raw materials such as paper. Greatly improved the quality of paper production efficiency, and expand the sources of raw materials of paper, reducing the cost of paper, in order to replace paper Penny opened up the prospects for the spread of culture has created favorable conditions.See Cai Lun invented paper on the ancient records, "after the Han Chuan Cai", said: "Since ancient times, the book of mutual covenant, made with bamboo and more; the use of thick waterproof silk, and paper. Thick waterproof silk and Jane your weight, and were not easy. homotopy Italy is made with tree skin, Ma Tau and spacious cloth, fishing nets that paper. "generations he has respect for China's papermaking inventor. (From "China's most" web site)
The four great inventions - the compass
It is used to determine the compass direction of a simple apparatus. It was formerly. The main component is mounted on an axis of the needle free to rotate (commonly known as magnet). Needle in the magnetic field can be maintained under the magnetic meridian in the direction of the tangent. Needle point to the geographic North Pole of the Antarctic, using the direction of this performance can be identified.Commonly used in navigation, geodesy, travel and military and so on.
The invention of the compass working people of our country, in the long-term practice of understanding of the results of magnetic objects. As a result of productive labor, it is contact with magnetite, and began to understand the nature of the magnetic. It is the first to discover the nature of magnetic iron primer. Was also found that the point of the magnet. After multi-party experiment and research, and finally the invention of the compass can be useful.
Excerpt from "Baidu," Network