Water clock - Wikipedia, the free encyclopedia
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A water clock or clepsydra (Greek κλέψτε kleptein , 'to steal'; ὕδωρ hydro , 'water') is any timepiece in which time is measured by the regulated flow of liquid into (inflow type) or out from ...
en.wikipedia.org/wiki/Water_clock
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Another Egyptian shadow clock or sundial, possibly the first portable timepiece, came into use around 1500 BCE. This device divided a sunlit day into 10 parts plus two "twilight hours" in the morning and evening. ... [water clock thumbnail]
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physics.nist.gov/GenInt/Time/early.html
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In use, the vessel was filled with water, which leaked out slowly from a small hole near the bottom. The time is indicated by the level of the water in the vessel, which is shaped so that it falls at a uniform rate. ... Early Egyptian water clock, 1415-1380 BC.
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www.sciencemuseum.org.uk/objects/time_measurement/1923-...
www.sciencemuseum.org.uk/objects/time_measurement/1923-48.aspx
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In use, the vessel was filled with water, which leaked out slowly from a small hole near the bottom; the time being indicated by the level of the water remaining within. ... Egyptian water clock of the outflow type, 1390-1352 BC.
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www.sciencemuseum.org.uk/images/I012/10326214.aspx
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Egyptian shadow clock with Obelisk ... Another Egyptian shadow clock or sundial, possibly the first portable timepiece, came into use around 1500 B.C. to measure the passage of "hours." This device divided a sunlit day into 10 parts plus two "twilight hours" in the morning and evening. ... Early water clock...
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inventors.about.com/library/weekly/aa071401a.htm
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The Egyptians had perhaps the first accurate water clock. One jar with a tiny hole in the bottom was filled with water and put above a second jar. The water dropped continuously into the second jar, which had a time scale on the side. ... The Problem: Design an Egyptian water switch/clock that turns on once every few seconds.
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www.members.shaw.ca/applytech/at/egyptian.htm
www.members.shaw.ca/applytech/at/egyptian.htm
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Did you know that ancient Egyptians had clocks? An ancient Egyptian clock was a stone bowl of water with a scale of notches marked inside it and a hole at the bottom. The Egyptians could tell the time by watching the water level as it dropped down past the notches.
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www.slpl.lib.mo.us/kidzone/stuff/clock.htm
www.slpl.lib.mo.us/kidzone/stuff/clock.htm
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Civilisation in early times was concentrated around the Mediterranean, where there was lots of sunshine and water aplenty for the then relatively small populations. Here time keeping was developed along two main lines - from the shadow stick, probably the earlier, and then the water clock.
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www.zetnet.co.uk/sea.jnp/earth.4/time.htm
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The outside surface of this clepsydra, or water clock, is decorated with figures and text that show symbols of certain planets and constellations and give a list of the protective spirits for each of the ten days of the ancient Egyptian week.
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www.eternalegypt.org/EternalEgyptWebsiteWeb/HomeServlet...
www.eternalegypt.org/EternalEgyptWebsiteWeb/HomeServlet?ee_website_action_key=action.display.element&story_id=&module_id=&element_id=60513&language_id=1
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