Motion and Time of Class 7
The water clock appears to have been invented about 1,500 BC and was a device which relied on the steady flow of water from or into a container. Measurements could be marked on the container or on a container for the water. In comparison with the candle or the oil lamp, the clepsydra was more reliable, but the water flow still depended on the variation of pressure from the head of water in the container.
In the year of 300 to 1300 AC chiness astronomical and astrological clock making was developed .We can see different types of water clocks that was develop in China. The astronomer Su Sung and his associates built an water clock in 1088 AC. This device was made with a water-driven bucket system .originally invented about 725 CE.