Mechanical clocks - Yi Xing, who was a mathematician and a monk among other things, is credited as the inventor of the origi… | Clock, Mechanical clock, Inventions
The Pope and the Pendulum: The First Mechanical Clock Was a Medieval Catholic Invention | uCatholic
Medieval Times | 400s-1400s Inventions
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When Time Was Born: Renaissance-Period Clocks - Beauty, Rarity, History: The M.S. Rau Blog Blog from ArtfixDaily.com