Heavenly clockwork the great astronomical clocks of medieval China
Needham, Joseph,1900-1995.
Wang, Ling.
Price, Derek J. de Solla(Derek John de Solla)1922-1983.
Cambridge Cambridge University Press
1986
Previous ed.: Cambridge : Published in association with the Antiquarian Horological Society at the University Press, 1960
Bibliography: p216-228. - Includes index
Astronomical clocks