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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 ...
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.
Islamic water clocks, which used complex gear trains and included arrays of automata, were unrivalled in their sophistication until the mid-14th century. [40] [41] Liquid-driven mechanisms (using heavy floats and a constant-head system) were developed that enabled water clocks to work at a slower rate. [41]
X values are always between 0 and 1. For square images, Y values are also between 0 and 1. The maximum Y value is higher for tall images, lower for wide images. The X and Y values represent the fraction of the width where the label will be placed. The exact point is the top-left corner of the image label.
A reproduction of the elephant clock in the Ibn Battuta Mall, Dubai. A reproduction in Kasımiye Medrese, Mardin, Turkey. The timing mechanism is based on a water-filled basin hidden inside the elephant. In the bucket is a deep bowl floating in the water, but with a small hole in the centre. The bowl takes half an hour to fill through this hole.
Modern water clock by Bernard Gitton Bernard Gitton ( French pronunciation: [bɛʁnaʁ ʒitɔ̃] ); born 24 June 1935 [ 1 ] ) is a French physicist and artist who has built modern water clocks , fountains and other devices relating art and science.
The clock was designed by the French artist Bernard Gitton and set up in 1982. The water clock displays the time by filling glass spheres with brightly colored liquid, in a cycle that repeats every 12 hours. The whole system is controlled by a pendulum swinging in the lower half of the clock. [2]
The water clock has two pumps in the basement – one that keeps the clock working, and a backup in case the first fails. The 70 US gallons (260 L) of fluid in the clock is not pure water. It is composed of deionized water (to keep it electrically non-conductive), coloring (to make the water easier to see), and methyl alcohol (to keep bacteria ...