It was a clepsydra formed by vertical walls and suitable engraved hour graduations of parabolic type in order to measure equal time intervals (hours) (as compensation to the variable hydrostatic pressure at the outflow hole of its bottom).
It was a clepsydra formed by vertical walls and suitable engraved hour graduations of parabolic type in order to measure equal time intervals (hours) (as compensation to the variable hydrostatic pressure at the outflow hole of its bottom).