| 11. | It appears that during Amenhotep I's reign the first water clock was invented.
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| 12. | Therefore, Jang went to China to study the various designs of water clocks.
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| 13. | The clock in Apuleius's account was one of several types of water clock used.
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| 14. | In Greece, a water clock was known as a clepsydra ( water thief ).
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| 15. | A display of two outflow water clocks from the Ancient Agora Museum in Athens.
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| 16. | The garden was also, possibly, the location of a water clock, constructed by Al-Zarqali.
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| 17. | Since Yi Xing's clock was a water clock, it was affected by temperature variations.
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| 18. | A commonly used water clock was the simple outflow clepsydra.
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| 19. | This formula can be used to calibrate a water clock.
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| 20. | In al-Jazari's 1206 treatise, he describes one of his water clocks, the elephant clock.
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