File:Beijing Ancient Observatory 91105.jpg

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English: Water-Powered Armillary Sphere and Tower. Song dynasty, Su Song and Han Gonglian, 1092 AD (replica). Ancient Observatory Museum, Beijing

The incredibly sophisticated instrument shown here is a model of an ancient device, that combined the functions of a water-powered clock, armillary sphere, and celestial globe. Powered only by gravity in the form of falling water, and driven by a sophisticated gearing and escapement mechanism, it could both tell the time and model the ever-changing motion of the heavens.
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current00:38, 8 December 2015Thumbnail for version as of 00:38, 8 December 20151,821 × 2,509 (3.23 MB)G41rn8 (talk | contribs)User created page with UploadWizard

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