Yanshu - Enshu

Japanese: 燕粛 - えんしゅく
Yanshu - Enshu

...This was designed so that the amount of water flowing out was proportional to the time by letting water flow down a number of boxes lined up low one after the other. The water clock, created by Yan Su of the Northern Song Dynasty in 1030, was an advanced model that allowed the excess water to flow out to the outside, thereby keeping the water level inside the box constant.
[China's time system]
In China, the calendar was changed with each successive dynasty, but the time system remained constant, with a 100-hour day system.

*Some of the terminology explanations that mention "Yanshu" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…これは次々に低く並べた多くの箱を水が流れ下ることによって,最後に流出する水量を時間に比例するようにくふうされたものである。北宋の燕粛が1030年につくった漏刻では,余分の水を外部に流出させることによって箱の中の水の高さを一定にした進歩したものである。
[中国の時刻制度]
 中国では王朝の交替によって暦法は改められたが,時法はいちおう不変で1日100刻制で一貫していた。…

※「燕粛」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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