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Reference.org
Elephant clock
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<p>The elephant clock was a model of <a href="/facts/Water_clock/GCgGB46l">water clock</a> invented by the medieval Islamic engineer <a href="/facts/Ismail_al-Jazari/ycMzl2tU">Ismail al-Jazari</a> (1136–1206). Its design was detailed in his book, <i>The Book of Knowledge of Ingenious Mechanical Devices.</i> </p>