5 About 700 years ago, people started to make
mechanical clocks. At first, they used weights to
power these clocks. The clocks told the hour with
bells. However, the weights were big and heavy, so
these clocks were difficult to move.
5
6 About 500 years ago, people improved tbaur
clocks. They used springs to power the clocks.se
springs were small and light. So people could move
っる
the clocks easily. Eventually, people began to carry
watches.
[74 words] 10
ありがとうございます😊