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A digital clock is a type of clock that displays the time digitally, i.e. in numerals or other symbols, as opposed to an analog clock, where the time is indicated by the positions of rotating hands.
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The first mechanical clock used water.It was built by Su Sung in china.It couldn t measure minutes because it only had an hour hand
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A candle clock is a thin candle with consistently spaced marking that when burned, indicate the passage of periods of time. While no longer used today, candle clocks provided an effective way to tell time indoors, at night, or on a cloudy day.