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The magnetic compass was first invented as a device for divination as early as the Chinese Han dynasty and Tang dynasty (since about 206 BC). [1] [3] [34] The compass was used in Song dynasty China by the military for navigational orienteering by 1040–44, [22] [35] [36] and was used for maritime navigation by 1111 to 1117. [37]
The compass's origins may be traced back to the Warring States period (476–221 BC), when Chinese people utilized a device known as a si nan to point in the right direction. During the early Song dynasty, a spherical compass with a small needle made of magnetic steel was created after steady development.
A sophisticated economic system in imperial China gave birth to inventions such as paper money during the Song dynasty (960–1279). The invention of gunpowder in the mid 9th century during the Tang dynasty led to an array of inventions such as the fire lance, land mine, naval mine, hand cannon, exploding cannonballs, multistage rocket and ...
The system of strongholds and manors also had effects on the economical mode of following dynasties. In addition, because of the collapse of the imperial court, those worn copper coins were not melted and reminted and many privately minted coins appeared. In the Three Kingdoms period, newly minted coins never made their way into currency.
A canal lock system in modern-day France which uses the pound lock system developed during the Song dynasty. In ancient China, the sluice gate, the canal lock, and flash lock had been known since at least the 1st century BCE (as sources then alluded that they were not new innovations), during the ancient Han dynasty (202 BCE–220 CE). [67]
The study of geography in China begins in the Warring States period (5th century BC). It expands its scope beyond the Chinese homeland with the growth of the Chinese Empire under the Han dynasty and enters a golden age with the Han dynasty invention of the compass as one of the Four Great Inventions.
Children's instructive toy chariot in Chinese display at Expo 2005 in Japan. The invention of the south-pointing chariot also made its way to Japan by the 7th century. The Nihon Shoki (The Chronicles of Japan) of 720 described the earlier Chinese Buddhist monks Zhi Yu and Zhi You constructing several south-pointing Chariots for Emperor Tenji of Japan in 658. [9]
A Han dynasty (202 BC–220 AD) ladle-and-basin lodestone south-pointing compass, used by ancient Chinese geomancers, but not for navigation. However, it was not until the time of Shen Kuo that the earliest magnetic compasses would be used for navigation .