South Pointing Chariot
Fang Xuanling recorded in the Book of Jin chronicle that at around 340 CE a Jie state Later Zhao's scholar Xie Fei serving as a Head of Healing (Medicinal) Department in the Later Zhao State Chancellery, was a mechanical engineer who built a South Pointing Chariot (also called south-pointing carriage), a directional compass vehicle which apparently did not use magnetic principle, but was operated by use of differential gears (which apply an equal amount of torque to driving wheels rotating at different speeds), or a similar angular differential principle.
For the great ingenuity shown in the construction of the device, the Later Zhao Emperor Shi Jilong granted Jie Fei the noble title of hou without land possessions and generous rewarded him generously.
Read more about this topic: Jie People
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