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The Pythagoras cup
It was an ingenious wine cup which had a line that determined the limit of fulfillment and an axial or curved siphon. When one filled it excessively, the level of liquid covered the siphon and emptied automatically. It is considered an invention of Pythagoras (6th century BC) who wanted to teach his students the necessity of complying moderation in our lives. It is also called the cup of justice because it reflects the basic principles of justice (vituperation and vengeance). When the limit was exceeded (vituperation), lost was not only that which exceeded the limit but also that which had been acquired up to then.
SOURCES: "Heron of Alexandria, Pneumatica"