Jayrun Water Clock
The Jayrun Water Clock, a water clock built by the List of inventions in the medieval Islamic world, Muslim engineer Muhammad al-Sa'ati, was positioned at the gate of Damascus, Syria, at the exit of the Umayyad Mosque in the 12th century during the reign of Nur ad-Din Zangi.Hill, Donald Routledge. "A History of Engineering in Classical and Medieval Times", p. 234 There is a full description of the clock in the treatise ''Ktab 'Amal al-sa'at wa-l-amal biha'' (''On the Construction of Clocks and their Use'') written by Riḍwān ibn al-Sāʿātī, Ridwan b. al Saati in 1203. This treatise describes the reconstruction by Ridwan of the water clock which was built by his father, Muhammad al-Saati, in the reign of Nur al-Din Mahmud b. Zanki in Damascus (reigned 1154–74). "The clock-face consisted of wall of timber about 4.23 metres wide and 2.78 metres high. In this screen was a row of doors, at either end of which was the figure of a falcon. During the day a small crescent moved at c ...
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