When emperor Wu of the (Liu) Sung subdued Kuan-chung he obtained
the south-pointing carriage of Yao Hsing, but it was only the shell with
no machinery inside. Whenever it moved it
had to have a man inside to turn (the figure). In the Sheng-Ming
reign-period, Kao Ti commissioned Tsu Chhung-Chih to reconstruct it according
to the ancient rules. He accordingly made new machinery of bronze,
which would turn round about without a hitch and indicate the direction
with uniformity. Since Ma Chün's time such a thing had not been.