Seismograph is a masterpiece created by Zhang Heng, a scientist in the Eastern Han Dynasty. During the Eastern Han Dynasty when Zhang Heng lived, earthquakes were frequent. Zhang Heng has a lot of personal experience about earthquakes. In order to master the national earthquake dynamics, after years of research, he finally invented the Hou Feng seismograph in the first year of Yangjia (AD 132), which was also the first seismograph in the world.
The seismograph has eight directions. There is a dragon ball in the mouth of each direction, and there is a toad under each faucet. If there is an earthquake on both sides, the dragon ball in the longkou in that direction will fall into the toad's mouth, so that the direction of the earthquake can be measured.
2. Iron plough
The iron plow first appeared in China during the Spring and Autumn Period and the Warring States Period. Iron plows from the Warring States Period were unearthed at Yanxiadu Site in Yixian County, Hebei Province and Huixian County, Henan Province.
The invention of the iron plough share is a remarkable achievement, which marks a new period of human social development and a new stage of human struggle to transform nature. The iron plow, a farm tool in the Han Dynasty, has a plow wall and can turn over and break the soil. /kloc-the iron plow was introduced into Holland in the 0/7th century, which triggered the agricultural revolution in Europe.
3. polonium
Polonium is an ancient sowing tool. Pulled by livestock and supported by someone behind, ditching and planting can be completed at the same time. Plant one or more ridges at a time, traditionally up to 5 ridges. Its farming tool is the predecessor of the present seeder, sowing with polonium.
Also called "ground". Polo is also called polonium plow. According to Cui Mang's political theory in the Eastern Han Dynasty, the plow was invented by Zhao Guo, commander of the Western Han Dynasty who was searching for millet. Its usage and effect are as follows: "Three plows * * * one cow, one race, the next race." This kind of plow is the three-legged plow still in use in the northern countryside.
4. keel waterwheel?
The keel waterwheel is also called "rollover", "treadmill" and "waterwheel", and it is called "keel" in the province. Irrigation tools in the history of Han nationality are very popular in most areas of China. This kind of water lifting facility has a long history. Because it is shaped like a keel, it is named "keel waterwheel".
Its structure is that the wooden board is used as the groove, the tail is immersed in the water flow, and there is a small shaft 1. At the other end, there is a small shaft, which is fixed on the wooden frame of the embankment. When in use, step on the turnstile to make the big wheel shaft rotate, and drive the blades in the groove to wipe water upwards and pour it into the higher ground.
Later, there was a water-to-dragon-bone cart powered by running water, and the ox cart pulled the ox wheel and turned over. And a car turned over by the wind. In Guangdong and other places, it is called "hand shaking" when it is lightly applied to the ditch between fields.
5. Lingqu?
Lingqu, called Qin Interception Canal, Lingling Canal, Douhe Canal and Xing 'an Canal in ancient times, is a great project created by working people in ancient China. Located in Xing 'an, Guangxi Zhuang Autonomous Region, it was opened to traffic in 2 14 BC.
Lingqu from east to west connects Haiyang River in the east of Xing 'an (the source of Xiangjiang River flows from south to north) and Darong River in the west of Xing 'an (the source of Lijiang River flows from north to south). It is one of the oldest canals in the world and has the reputation of "the pearl of ancient water conservancy buildings in the world".
Baidu encyclopedia-seismograph
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