Cosmic Engine

Su Sung's Cosmic Engine "The Science Museum (London) has a scale model of the 'Cosmic Engine', which Su Sung, a Chinese polymath, designed and constructed in China in 1092. This great astronomical hydromechanical clock tower was about ten meters high (about 30 feet) and featured a clock escapement and was indirectly powered by rotating wheel either with falling water and liquid mercury which does not freeze during sub-zero temperatures and flows freely allowing operation of the clock during winter. Also there is a full-sized working replica of Su Sung's clock in the Republic of China (Taiwan)'s National Museum of Natural Science, Taichung city. This exquisite full-scale, fully functional replica is reported to be 12 meters (40 feet) in height and was painstakingly constructed from Su Sung's original descriptions and mechanical drawings" Wikipedia

Here the astronomical clock face and animated figures of Prague Astronomical Clock