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Beaufort Scale

1911 Encyclopedia Britannica

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1911 Encyclopedia Britannica
• Beaufort Scale

Beaufort scale.

Corresponding wind.

Limits of hourlyvelocity.

Numbers.

Miles per hour.

o

Calm

Under 2

1-3

Light breeze

2-12

4-5

Moderate wind

13-23

6-7

Strong wind

24-37

8-9

Gale

38-55

io-i

Storm

56-75

12

Hurricane

Above 75

BEAUFORT SCALE, a series of numbers from o to 12 arranged by Admiral Sir Francis Beaufort (1774-1857) in 1805, to indicate the strength of the wind from a calm, force o, to a hurricane, force 12, with sailing directions such as "5, smacks shorten sails" for coast purposes, and "royals, &c., ` full and by '" for the open sea. An exhaustive report was made in 1906 by the Meteorological Office on the relation between the estimates of wind-force according to Beaufort's scale and the velocities recorded by anemometers belonging to the office, front which the following table is taken: -