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  A vertical structure with four sides used as a shadow clock
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  A water clock that used the flow of water to measure time.
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  A flat circle with a 12 hour clock face and a gnomon (vertical marker).
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  Notches were made in candles and the candle then lit, each notch representing a period of time.
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  Two upright containers joined with a narrow opening and a material inside one container, marking time by this material running out when being flipped over.
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  Clock using a system of weights and balances to mark out increments of time over a 12 hour period.
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  Portable timepiece that people could carry and wear.
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  A clock using a rod like weight that swings side to side and measures minutes and seconds.
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  A watch that displays the time digitally, in numerical form.