For contents, see Author Catalog.There is the possibility that the latter machines were intended to be mobile and mounted on wheels, as are the trebuchets illustrated in the i ith-century Sung military manual, Wu Ching Tsung Yao, c ... Three different versions in chapter 14 give the distances between the machines deployed along the wall as 300, 1 80, ... Section 4, a#39;Thien Chi II Vn Ltf (Thien Chi Asks about Ramparts), Sun Pin Ping Fa, p.
|Title||:||Science and Civilisation in China: Volume 5, Chemistry and Chemical Technology, Part 6, Military Technology: Missiles and Sieges|
|Author||:||Joseph Needham, Ling Wang|
|Publisher||:||Cambridge University Press - 1954|