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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 ...
There are no recognised examples in existence of outflowing water clocks from ancient Mesopotamia, but written references have survived. [14] The introduction of the water clock to China, perhaps from Mesopotamia, occurred as far back as the 2nd millennium BC, during the Shang dynasty, and at the latest by the 1st millennium BC. Around 550 AD ...
Water clocks have a long history of use in Korea with the first mention of one in the records of the Samguk Sagi during the Three Kingdoms era. In 1434, during the reign of King Sejong the Great a water clock was made by Jang Yeong-sil which would mark the hour automatically with the sounds of a bell, gong, and drum.
Water clocks are one of the oldest time-measuring instruments. [2] In ancient China, as well as throughout East Asia, water clocks were very important in the study of astronomy and astrology. The oldest written reference dates the use of the water clock in China to the 6th century BC. [3]
Ctesibius' water clock, as visualized by the 17th-century French architect Claude Perrault. Ctesibius or Ktesibios or Tesibius (Ancient Greek: Κτησίβιος; fl. 285–222 BCE) was a Greek inventor and mathematician in Alexandria, Ptolemaic Egypt. [1] Very little is known of Ctesibius' life, but his inventions were well known in his ...
[2] kè literally means "mark" or "engraving", referring to the marks placed on sundials [4] or water clocks [5] to help keep time. Using the definition of kè as 1 ⁄ 100 of a day, each kè is equal to 0.24 hours, 14.4 minutes, or 14 minutes 24 seconds. Every shí contains 8 1 ⁄ 3 kè, with 7 or 8 full kè and partial beginning or ending kè.
Oct. 16—A young, Northern New Mexico farmer takes a stone bowl to two scientists and tells them this ancient relic can be a tool for learning about the essence of water. One scientist dismisses ...
Scale model of the ‘water’ half of Jang Yeong-sil's self-striking water clock. Samguk Sagi records that an office overseeing the use of water clocks had been established during the Three Kingdoms period. The Korean water clock consisted of two stacked jars of water, with water dropping from the top to the bottom at a measured rate.