History Mesh

Su Song's Astronomical Clock Tower (1094)

Su Song built a water-driven astronomical clock tower in medieval Kaifeng, which employed the use of an early escapement mechanism to keep more accurate time.

The escapement mechanism of Su’s clock tower had previously been invented by Buddhist monk Yi Xing and government official Liang Lingzan in 725 AD to operate a water-powered armillary sphere, although Su’s armillary sphere was the first to be provided with a mechanical clock drive.

Read more about Su Song's Astronomical Clock Tower on Wikipedia.