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Scientific and Mathematical Contributions

Clockwork and Timekeeping:

-in 725, Yi Xing invented worlds first clockwork escapement mechanism
-rotated armillary sphere in representation of astronomical observations, powered by clockwork escapement mechanism, clepsydra clock and waterwheel
-had mechanically timed belt that automatically struck every hour
-had drum that was automatically struck every quarter hour
-became well known through the country
students attempting to pass imperial exam had to write essay on it

Mechanical Inventions:

-mechanical wine server
.........-3 ft tall
.........-in shape of artificial mountain
.........-carved out of iron
.........- set upon a lacquered-wooden tortoise frame
.........- used hydraulic pump

Medicine:

-675 Gaozong started a project to publish the first medical book with text and pictures
- book included 833 medicines that could be taken from; stones, metals, minerals, animals, herbs,p lants, fruits, vegetables and cereal crops
- had medical colleges
- state examinations for doctors
- publishing forensic manuals for physitians
- Zhen Qian = first identified diabetes in writing
.........-patients with diabetes had excess sugar in urine
-Sun Simiao = first to recognize that diabetic patients worsened with the consumption of alcohol and starch

(source: http://en.wikipedia.org/wiki/Tang_Dynasty#Science.2C_technology.2C_and_medicine)