The astronomical clock tower in Kaifeng features …

Years: 1088 - 1088

The astronomical clock tower in Kaifeng features an escapement mechanism and the world's oldest known endless power-transmitting chain drive to operate the armillary sphere, opening doors, and mechanical-driven mannequins that rotate in shifts to announce the time on plaques.

Its construction in 1088 is based on a successful pilot model by polymath statesman and scientist Su Song.

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