History of the clock

This is an PowerPoint presentation for the New Horizon coursebook 2 unit 3 , about the history of the clock page 52-55. There is some extra information and videos. With the presentation I recommend you taking some sticks maybe a candle and actually make a water clock to make the presentation more interesting for the children. This is because the presentation can take a long time. The more you can grab the children's attention the better.