The water clock was invented in Ancient Egypt. The water clock was used to tell time and to measure speeches in the courtroom. The inventor of the water clock was Ctesibius, a Greek inventor from Alexandria, Egypt. Ctesibius just did not invent, it he also improved it by adding a float with a rack that turned a toothed wheel. He made the water clock make sounds like a whistling bird, bells, puppets, and other gadgets. Ctesibius lived and invented the water clock in the third century.