Water Clock (Klepsydra), end of 5th c. B.C., Clay
Height: 0.232 m, Diameter: 0.28 m
The Agora Museum, Athens
The Agora vessel bears two inscriptions: “ΑΝΤΙΟ…”, demonstrating that the klepsydra belonged to the Antiochis tribe, and XX.., indicating the capacity of the vessel, i.e. two choes (6.4 litres). This means that it took 6 minutes to empty.
(Adapted from http://odysseus.culture.gr/h/4/eh430.jsp?obj_id=10322)