An hour glass, sometimes called a sand glass or a sand clock, keeps time. When the hour glass was invented in the third century in Alexandria, it was sometimes worn like a watch on a chain. The specific length of time each hour glass measures is reckoned by how long it takes the sand inside to run from one bulb to the other. In this activity, your child will make her own sand clock, and learn to measure the time it keeps.
What You Need:
- Stop watch or watch that counts seconds
- Very dry sand or salt
- 2 clean baby food jars of the same size
- Scissors
- Heavy paper
- Hole punch
- Masking tape
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