Beaufort Scale
In 1805 Admiral Beaufort drew up a scale of wind strengths related to commonly observable phenomena.
Force ...
Beaufort Scale. A numerical system, ranging from 0 (Calm) to 12 (Hurricane) to classify the speed of the wind and covering a range of 0 to 75 m.p.h. or over.
 See also: Propeller, Aviation, Glide, Plane, Structure
  
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