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A model of the water clock. The Borugak Jagyeongnu ("Water Clock of Borugak Pavilion"), classified as a scientific instrument, is the 229th National Treasure of South Korea and was designated by the South Korean government on March 3, 1985. The water clock is currently held and managed by the National Palace Museum of Korea in Seoul.
A Korean sundial first made by Jang Yeong-sil during the Joseon period, displayed in Gyeongbokgung. Jang's invention of the water clock saw the start of its use throughout the country, however, these water clocks were very costly. Development of the sundial provided a cheaper and more manageable alternative.
A water clock, or clepsydra (from Ancient Greek κλεψύδρα (klepsúdra) 'pipette, water clock'; from κλέπτω (kléptō) 'to steal' and ὕδωρ (hydor) 'water'; lit. ' water thief ' ), is a timepiece by which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel, and where the amount ...
Mechanical water clock; In 1433, the scientist Jang Yeong-sil invented an automatic time-annunciating clepsydra called the Striking Palace Clepsydra under an order from Sejong the Great; the uniqueness of the clock was its capability to announce dual-times automatically with both visual and audible signals. [276]
Water clock and sundial (Jagyeongnu and Angbuilgu) (물시계와 해시계(자격루와 앙부일구)) Jagyeongnu is a water clock invented during the Joseon dynasty's Sejong period and is characterized by the installation of a device that automatically notifies the time.
In 1434, inventor Jang Yeong-sil developed Korea's first automatic water clock, which King Sejong adapted as Korea's standard timekeeper. It is likely that Koreans used water clocks to keep time prior to this invention, but no concrete records of them exist. [6]
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Korean Water Clocks: Jagyongnu, The Striking Clepsydra and The History of Control and Instrumentation Engineering (in Korean). Seoul: Konkuk University Press. Nam, Moon-Hyon (1998). "On the BORUGAKGI of Kim Don—Principles and Structures of JAYEONGNU". Hanguksa Yeongu (Studies on Korean History) (in Korean). 101: 75– 114.