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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 ...
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 ...
c. 3500 BC - Egyptian obelisks are among the earliest shadow clocks. [1] c. 1500 BC - The oldest of all known sundials, dating back to the 19th Dynasty. [2] c. 500 BC - A shadow clock is developed similar in shape to a bent T-square. [3] 3rd century BC - Berossos invents the hemispherical sundial. [4] 270 BCE - Ctesibius builds a water clock.
The 8 m high structure also featured sundials and a water clock inside dates from around 50 BC. [44] Clock tower: 50 BC See Clock tower. [45] Tower of the Winds: Automatic doors: c. 1st century AD Heron of Alexandria, a 1st-century BC inventor from Alexandria, Egypt, created schematics for automatic doors to be used in a temple with the aid of ...
2000 BC: Water clock by at least the old Babylonian period (c. 2000 – c. 1600 BC), [192] but possibly earlier from Mohenjo-Daro in the Indus Valley. [193] 2000 BC: Chariot in Russia and Kazakhstan [194] 2000 BC: Fountain in Lagash, Sumer. 2000 BC: Scissors, in Mesopotamia. [195] 1850 BC: Proto-alphabet (Proto-Sinaitic script) in Egypt. [196]
Alarm clock: The Hellenistic engineer and inventor Ctesibius (fl. 285–222 BC) fitted his clepsydras with a dial and pointer for indicating the time, and added elaborate "alarm systems, which could be made to drop pebbles on a gong, or blow trumpets (by forcing bell-jars down into water and taking the compressed air through a beating reed) at ...
1 Overview of water clocks and other time instruments. 2 Arabic & Islamic water clocks. 3 Babylonian water clocks. 4 Chinese water clocks. 5 Egyptian water clocks.
Clock at the Iguatemi Mall in Porto Alegre, Brazil. He constructed " The Water Clock ", at The Children's Museum of Indianapolis , [ 3 ] [ 4 ] "Clepsydra Water Clock" at Abbotsford, British Columbia , [ 5 ] " Time Flow Clock " Europa Center , Berlin , [ 6 ] and "Time-Flow Clock" Rødovre Centrum, Denmark . [ 7 ]