自擊漏의 水位制御 方式에 대한 歷史的 考察 = Water-Level Control for the Striking Clepsydra Rediscovered

다국어 초록 (Multilingual Abstract)

The Striking Clepsydra Jagyongnu made in 1434 by King Sejong was well-known for its elaborate ball-operated time annunciating jackwork mechanisms. The details of the clepsydra is described on the Sejong Sillok(Veritable Records of King Sejong) Chapter 65. The clepsydra consists of four water-supply vessels different in sizes, two water-receiving vessels of the same size and two floating indicator-rods. At the top of each water-receiving vessels, ball-rack mechanisms are erected to generate discrete dual time-signals for annuniciating twelve double-hours and five night-watches and their five points.
In this paper water-level control method for one-inflow clepsydra model is proposed for the Striking Clepsydra after re-examining the records, various literatures and the surviving parts of the New Striking Clepsydra which is the duplication of the Striking Clepsydra in 1536. The four water-suppy vessels were rearranged in the order of height; a reservoir, a compensating vessel, a constant-level tank and receptacle. This arrangement was supposed to be used for the Striking Clepeydra and water-level control technique was influenced by medieval Chinese overflow method used by Yensu and Shenkua of Sung Dynasty.