Jayrun Water Clock

The Jayrun Water Clock, a water clock built by the 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.

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).

During the day a small crescent moved at constant speed in front of the doors and at every hour a door rotated to reveal a different colour, the falcons leant forward, discharged pellets on to cymbals and resumed their upright positions.

The clock was operated by the "Archimedes" water machinery and the motion transmitted to the activating mechanisms by pulley and rope systems.

"[2][3] A full-size reconstruction of the clock can be seen in the Nationaal Beiaard- en Natuurmuseum Asten in the Netherlands.