A scale for measuring wind speed, ranging from 0 (calm) to 12 (hurricane force), developed by Admiral Francis Beaufort.
Named after Sir Francis Beaufort (1774-1857), an Irish Royal Navy officer who devised the scale in 1805. The scale was officially adopted by the British Admiralty in 1838 and became internationally recognized for maritime and meteorological use.
The Beaufort scale ingeniously uses observable effects rather than precise measurements - from 'smoke rises vertically' at force 0 to 'widespread damage' at force 12 - making it accessible to sailors long before sophisticated wind measurement instruments existed.
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