Beaufort scale

noun (no longer in technical use)
a scale of wind forces, described by name and range of velocity, and classified as from force 0 to force 12, or, sometimes, to force 17.
a scale of the states of sea created by winds of these various forces up to and including force 10.

1855–60; named after Sir Francis Beaufort (1774–1857), British admiral who devised it Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Beaufort scale
meteorol an international scale of wind velocities ranging for practical purposes from 0 (calm) to 12 (hurricane force). In the US an extension of the scale, from 13 to 17 for winds over 64 knots, is used
[C19: after Sir Francis Beaufort (1774--1857), British admiral and hydrographer who devised it]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

Beaufort scale
to measure wind velocity, developed 1806 by Sir Francis Beaufort (1774-1857), surveyor and hydrologist.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
Beaufort scale   (bō'fərt)  Pronunciation Key 
A scale for classifying the force of the wind, ranging from 0 (calm) to 12 (hurricane). A wind classified as 0 has a velocity of less than 1.6 km (1 mi) per hour; a wind classified as 12 has a velocity of over 119 km (74 mi) per hour. Other categories include light air, five levels of breeze, four levels of gale, and storm. The scale was devised in 1805 as a means of describing the effect of different wind velocities on ships at sea. It is named after an admiral in the British navy, Sir Francis Beaufort (1774-1857).
The American Heritage® Science Dictionary
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