12-07-2007 10:45

Water clocks have existed in one form or another for thousands of years. From Egypt to Asia, various civilizations have added new innovations and complexities. South Korea's national museum has unveiled a recreation of one of these developments - an automatic water clock originally made in 1434.

It was the earliest Korean water clock with an automatic chain system, produced for King Sejong over 5 hundred years ago.

It consists of three large, medium and small vessels, which store and release water. When the water is poured into the largest upper vessel, it flows down the smaller ones. As the water level rises, a floating rod touches a certain level and it causes a small metal ball to roll down to hit another bigger ball.