Question

What is a candle clock

Answer 1

A candle clock is a thin candle with consistently spaced markings, 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. 
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Answer 2

A candle clock is a thin candle with consistently spaced markings, 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. 
Hope it help you.....