Before there were clocks, there were candle clocks that burnt a set amount of house. If you wanted a reminder or alarm, you pushed a nail at the desired time length in the candle and when it melts to that point, the nail would fall and clank on the metal holder, alerting you.
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World's Fun Facts
RandomLet's read some facts! To know everything that you don't know about the world! Started - June 9, 2016 Finished - August 4, 2016