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In the early years of the Eastern Han Dynasty (AD) 1In the century, herringbone gears already existed. The guide car and the drum car that appeared during the Three Kingdoms period have adopted a gear transmission system. The water to wheel mill invented by Du Yu in the Jin Dynasty is a method of transmitting the power of a water wheel to a stone mill through gears. The earliest record of gear transmission system in historical books is about a group of Tang Dynasty officials and Liang Lingzan 725Description of a water powered globe manufactured in the year. The water transportation instrument platform (see ancient Chinese timers) manufactured during the Northern Song Dynasty utilized a complex gear system.
