Assertion: wind | /r/CapableOf | face end of a wind vane
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text: Up until the 1990s, wind speed and direction were measured by Dines pressure tube anemometers, these operate on the basis of the pressure caused by the wind blowing into an opening on the wind facing end of a wind vane, since the early 1990s these have been replaced by cup and vane anemometers, with wind speed measured by rotating cups, and direction by a separate wind vane.