Hydrochronometer
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A hydrochronometer is a kind of water clock.
In 1867 Fr. Giovan Battista Embriaco, O.P., inventor and professor of the College of St. Thomas in Rome, created a hydrochronometer and sent it to the Paris Universal Exposition of 1867, where it received many prizes. It had the shape of a wooden pinnacle made of cast iron fused as a tree trunk, while its four dials were visible from all directions.
In 1873, the water clock was returned to Rome and placed in Villa Borghese gardens into a fountain realized by the architect Gioacchino Ersoch. It is still there and works constantly.
In June 2007, after two years of restoration at , it was restarted by the Town Mayor of Rome.
Another hydrochromometer can be found at Palazzo Berardi, rione Pigna, Rome.