anemoscope
Sign in to savethumb|Tower of the Winds, Athens 2nd century BCE. A bronze Triton once served as a weather-vane but has vanished.
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thumb|Tower of the Winds, Athens 2nd century BCE. A bronze Triton once served as a weather-vane but has vanished.
An anemoscope is a device designed to show the direction of the wind, or to indicate a change of wind direction. The name is usually applied to an apparatus consisting of a wind vane above, connecting to a building below by some kind of coupling, and with a dial or index with pointers to show the direction and changes of the wind.
Excerpted from Wikipedia’s “anemoscope” article, available under the CC BY-SA 4.0 licence.