Su Song |

Mercator projection Ming Dynasty Clock tower Incense clock Three Departments and Six Ministries Emperor Zhezong of Song Scholar-bureaucrats Astronomical clock Jurchens Gerardus Mercator Armillary sphere Joseph Needham Water clock Horology Mineralogy Sundial Printing Han Dynasty Zoology Grasshopper escapement Pin-lever watch Beijing Chalcanthite Li Gonglin Nicolas Trigault Dial (measurement) Beijing Ancient Observatory Derk Bodde Noria Zheng Xuan Zhang Sixun Bencao Gangmu History of the Khitans Thomas Tompion George Graham (clockmaker) Huainanzi Clepsydra Realgar Chain pump Philo of Byzantium
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