See water clock. It is a hydraulic clock with a character as a needle to mark the hours (it is not a colossus hitting the chime, but I guess it is an antecedent). It was created by Ctesibius of Alexandria in the 3rd century BC and its main feature is a mechanism of siphons and gears that were adjusted automatically to the hours of the day throughout the year, since in the Egyptian system 12 daylight hours not lasting the same as twelve o'clock at night, because they varied according to the season of the year.
