A Factory Pulley System

Before factories used electricity and before factories burnt coal, factories relied on wind or water. A factory would use a system called belt and pulley to use that wind or water to make their machines work. Below are a number of pictures that show how the belt and pulley system worked.

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For 10 bonus points, in about 20 words, describe how the belt and pulley process works. Points will be awarded on accuracy. Write your answer on a piece of paper and give it to me in class or email me.