The Su Sung clock tower was over 30 feet tall. Doors opened that permitted the viewing of changing manikins which rang bells or gongs, and held tablets indicating the hour or other special times of the day.
photo from:
http://physics.nist.gov/GenInt/Time/early.html
The wheelbarrow has a single wheel witch a platform mounted on top.
photo from:
www.bcps.org/offices/lis/models/chinahist/han.html
The first ink was made from pine soot and glue.
photo from:
http://www.chinaculture.org/gb/en_madeinchina/2005-06/28/content_70182.htm
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