The National Palace Museum of Korea and a professor at Konkuk University Nam Moon-hyun recently succeeded in operating a 15th Century cutting-edge water clock, the Jagyeokru, in a traditional way after restoring it to its original form after 500 years. So far, there have been a number of attempts to test its operation in laboratories, but this was the first time the Jagyeokru had been restored to its original form and actually operated. The achievement came 20 years after the first attempt to find out the operating principle of Jagyeokru started. Above all, this was considered a great success to once again prove the excellence of Koreas ancient science. The Museum plans to make public the restored Jagyeokru in its exhibition room in Gyeongbokgung in November. Jagyeokrus size is six meters wide, two meters long and six meters high. The National Palace Museum of Korea provided the picture of Jagyeokru.