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A hydrochronometer is a kind of a 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 tree trunks, while its four dials were visible from every direction.
In June 2007, after two years of restoration at ELIS School, it was restarted by the Town Mayor of Rome.
Another hydrochromometer can be found at Palazzo Berardi, rione Pigna, Rome.
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