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**Anemometer** is a wind speed meter. The gauge consists of **four hemispherical bowls** that are mounted on **four horizontal arms**, with **90° angle** in between. The arms are attached to a **vertical shaft** that can be rotated freely by the horizontal arms.
The mechanical anemometer uses the wind power. ***The air flow can rotate the anemometer arms because the concave spherical surface creates a greater resistance than the convex surface***. Thanks to this, all four bowls are exposed to air.
The speed of the ends of the horizontal arms is different from the rate of the air flow (it is one third in the model).
