electricity

The candle clock. A timeless invention that has been used to measure time – and wake people up – for centuries. And it works in such a simple but cool way. Candle clocks, also known as candle timers, are devices that use the rate of burning of a candle to determine how much time has passed. A candle clock in its most basic form consists of a candle, a holder, and a marking … [Read more...] about People Used These Candle Clocks To Tell The Time And Wake Up Before Electricity