| 41. | Although the Greeks and Romans did much to advance water clock technology, they still continued to use shadow clocks.
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| 42. | With water clocks, and also candle clocks, modifications were made to have them make sounds on a regular basis.
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| 43. | However, the most accurate clocks available to these early navigators were water clocks and sand clocks, such as hourglass.
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| 44. | Those serving here placed four Water Clock Plates in the pond and to inform the time rang a bell.
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| 45. | Games involving members of both teams are not against the water clock and are known as " duels ".
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| 46. | The invention of the mechanical clock in the 14th century made the water clock and its feedback control system obsolete.
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| 47. | In these tablets, water clocks are used in reference to payment of the night and day watches ( guards ).
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| 48. | Alarm clocks first appeared in Ancient Greece around 250 BC with a water clock that would set off a whistle.
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| 49. | In China, as well as throughout eastern Asia, water clocks were very important in the study of astronomy and astrology.
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| 50. | _A unique illustration of a water clock design is from a 1315 Syrian treatise on the construction of mechanical devices.
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