Ma Jun (mechanical engineer)

Chinese practical man (floruit 200–265)

Ma Jun (fl. 200–265), courtesy name Deheng, was a Chinese practical man, inventor, and politician who lived in the state of Cao Wei during the Three Kingdoms period of China. His most notable invention was that of the south-pointing chariot, a directional compass vehicle which actually had no magnetic function, but was operated by use of differential gears (which applies equal amount of torque to driving wheels rotating at different speeds).

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