The world's earliest clock
Clepsydra clock, also known as pot leakage, leakage, leakage, clepsydramoment moment. It is equipped with the water pot, let the water from a small hole at the bottom of each drip down, this time. Generally use four mace pot, and under the mountain, mutually superimposed, with holes on three, by one by one on the water drip into the lower pot, finally a built-in vertical buoy, engraved on the bottom, the water gradually increased, the buoy rise, to notify the hour. Andwas made in to Huang Di, "remember," Han history "Hanshu" been written. This clock in at least has four thousand years of history, is the world's earliest clock.
This feeling is called clock far fetched, most be a timing tool.