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- Water_clock abstract "A water clock or clepsydra (Greek κλέπτειν kleptein, 'to steal'; ὕδωρ hydor, 'water') is any timepiece in which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel where the amount is then measured.Water clocks, along with sundials, are likely to be the oldest time-measuring instruments, with the only exceptions being the vertical gnomon and the day-counting tally stick. Where and when they were first invented is not known, and given their great antiquity it may never be. The bowl-shaped outflow is the simplest form of a water clock and is known to have existed in Babylon and in Egypt around the 16th century BC. Other regions of the world, including India and China, also have early evidence of water clocks, but the earliest dates are less certain. Some authors, however, claim that water clocks appeared in China as early as 4000 BC.Some modern timepieces are called "water clocks" but work differently from the ancient ones. Their timekeeping is governed by a pendulum, but they use water for other purposes, such as providing the power needed to drive the clock by using a water wheel or something similar, or by having water in their displays.The Greeks and Romans advanced water clock design to include the inflow clepsydra with an early feedback system, gearing, and escapement mechanism, which were connected to fanciful automata and resulted in improved accuracy. Further advances were made in Byzantium, Syria and Mesopotamia, where increasingly accurate water clocks incorporated complex segmental and epicyclic gearing, water wheels, and programmability, advances which eventually made their way to Europe. Independently, the Chinese developed their own advanced water clocks, incorporating gears, escapement mechanisms, and water wheels, passing their ideas on to Korea and Japan[citation needed].Some water clock designs were developed independently and some knowledge was transferred through the spread of trade. These early water clocks were calibrated with a sundial. While never reaching a level of accuracy comparable to today's standards of timekeeping, the water clock was the most accurate and commonly used timekeeping device for millennia, until it was replaced by more accurate pendulum clocks in 17th-century Europe.".
- Water_clock thumbnail AGMA_Clepsydre.jpg?width=300.
- Water_clock wikiPageExternalLink 1998%7Bf%7D_Waterclock_MS.PDF.
- Water_clock wikiPageExternalLink englund1988a.pdf.
- Water_clock wikiPageExternalLink sici?sici=0035-9149(198208)37%3A1%3C35%3ANWCATF%3E2.0.CO%3B2-I.
- Water_clock wikiPageExternalLink time.html.
- Water_clock wikiPageExternalLink time.
- Water_clock wikiPageExternalLink clepsydra.
- Water_clock wikiPageExternalLink waterclock.
- Water_clock wikiPageExternalLink HomeServlet?ee_website_action_key=action.display.element&story_id=19&module_id=5&language_id=1&element_id=60513.
- Water_clock wikiPageExternalLink the-clock-of-flowing-time.html.
- Water_clock wikiPageExternalLink griechenland_wasseruhr.htm.
- Water_clock wikiPageExternalLink page14.html.
- Water_clock wikiPageExternalLink iw-time-flow-clocks.
- Water_clock wikiPageExternalLink CLOCK1A.html.
- Water_clock wikiPageExternalLink WaterClock.aspx.
- Water_clock wikiPageExternalLink print_issue.php3?id=199668506116E.TXT&mag=past.
- Water_clock wikiPageExternalLink Water%20Clocks.pdf.
- Water_clock wikiPageID "424964".
- Water_clock wikiPageRevisionID "603275665".
- Water_clock created "600".
- Water_clock hasPhotoCollection Water_clock.
- Water_clock imageCaption "Water clock calculations by Nabû-apla-iddina.".
- Water_clock location "Room 55, British Museum".
- Water_clock name "Clay tablet".
- Water_clock size "D:".
- Water_clock size "H:".
- Water_clock size "W:".
- Water_clock writing Akkadian_language.
- Water_clock writing Cuneiform.
- Water_clock subject Category:Horology.
- Water_clock subject Category:Time_measurement_systems.
- Water_clock subject Category:Water_clocks.
- Water_clock comment "A water clock or clepsydra (Greek κλέπτειν kleptein, 'to steal'; ὕδωρ hydor, 'water') is any timepiece in which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel where the amount is then measured.Water clocks, along with sundials, are likely to be the oldest time-measuring instruments, with the only exceptions being the vertical gnomon and the day-counting tally stick.".
- Water_clock label "Clepsidra".
- Water_clock label "Clepsidra".
- Water_clock label "Clepsydre".
- Water_clock label "Clessidra".
- Water_clock label "Wasseruhr".
- Water_clock label "Water clock".
- Water_clock label "Wateruurwerk".
- Water_clock label "Zegar wodny".
- Water_clock label "Водяные часы".
- Water_clock label "ساعة مائية".
- Water_clock label "水時計".
- Water_clock label "水鐘".
- Water_clock sameAs Vodní_hodiny.
- Water_clock sameAs Wasseruhr.
- Water_clock sameAs Clepsidra.
- Water_clock sameAs Ur_erloju.
- Water_clock sameAs Clepsydre.
- Water_clock sameAs Clessidra.
- Water_clock sameAs 水時計.
- Water_clock sameAs 물시계.
- Water_clock sameAs Wateruurwerk.
- Water_clock sameAs Zegar_wodny.
- Water_clock sameAs Clepsidra.
- Water_clock sameAs m.026y7b.
- Water_clock sameAs Q194173.
- Water_clock sameAs Q194173.
- Water_clock wasDerivedFrom Water_clock?oldid=603275665.
- Water_clock depiction AGMA_Clepsydre.jpg.
- Water_clock isPrimaryTopicOf Water_clock.