How to make an hour glass?

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By: Ahmet Cengiz

A hour glass can be useful sometimes like in games. A hour glass is an old invention. But its been very useful to people for centuries. To make a hour glass you will need sand, bottle, wood. If you want you can also make it with water. This will relate to engineering by learning how to measure and plan while doing a hour glass. Also its a fun thing to do.