Look up weather vane in Wiktionary, the free dictionary.
A wind vane, weather vane, or weathercock is an instrument used for showing the direction of the wind. It is typically used as an architectural ornament to the highest point of a building. The word vane comes from the Old English word fana, meaning "flag".
A cockerel is a traditional figure used as a vane placed on top of the cardinal directions.
Although partly functional, wind vanes are generally decorative, often featuring the traditional cockerel design with letters indicating the points of the compass. Other common motifs include ships, arrows, and horses. Not all wind vanes have pointers. In a sufficiently strong wind, the head of the arrow or cockerel (or equivalent) will indicate the direction from which the wind is blowing.
Wind vanes are also found on small wind turbines to keep the wind turbine pointing into the wind.
History
Wind vanes feature on small horizontal-axis wind turbines
The oldest known textual references to weather vanes date from 1800-1600 BCE Babylon, where a fable called The Fable of the Willow describes people looking at a weather vane "for the direction of the wind."[1] In China, the Huainanzi, dating from around 139 BC, mentions a thread or streamer that another commentator interprets as "wind-observing fan" (hou feng shin, 侯風扇).[2]
The Tower of the Winds in the agora in Hellenistic Athens once bore on its roof a weather vane in the form of a bronze Triton holding a rod in his outstretched hand, rotating as the wind changed direction. Below this a frieze depicted the eight Greek wind deities. The eight-metre-high structure also featured sundials, and a water clock inside. It dated from around 50 BC.[3]
Military documents from the Three Kingdoms period of China (220–280 AD) refer to the weather vane as "five ounces" (wu liang, 五兩), named after the weight of its materials.[2] By the third century, Chinese weather vanes were shaped like birds and took the name of "wind-indicating bird" (xiang feng wu, 相風烏). The Sanfu huangtu (三輔黃圖), a third-century book written by Miao Changyan about the palaces at Chang'an, describes a bird-shaped weather vane situated on a tower roof.[2]
The oldest surviving weather vane with the shape of a rooster is the Gallo di Ramperto, made in 820 and now preserved in the Museo di Santa Giulia in Brescia, Lombardy.[4][5]
Oast houses have vanes to ensure a controlled draught of air flows through the building.
Pope Gregory I (in office 590 to 604) regarded the cock as "the most suitable emblem of Christianity", being the emblem of Saint Peter (a reference to Luke 22:34 in which Jesus predicts that Peter will deny him three times before the rooster crows).[7][8]
As a result of this,[7] rooster representations gradually came into use as a weather vanes on church steeples, and in the ninth century Pope Nicholas I[9] (in office 858 to 867) ordered the figure to be placed on every church steeple.[10]
One alternative theory about the origin of weathercocks on church steeples sees them as emblems of the vigilance of the clergy calling the people to prayer.[11]
A modern scientific weathervane, gives the direction of the wind as an electrical signal.
Another theory says that the cock was not a Christian symbol[12] but an emblem of the sun[13] derived from the Goths.[14]
Dragon weather vane from the Index to American Design, National Gallery of Art.
Early weather-vanes had very ornamental pointers, but modern weather-vanes usually feature simple arrows that dispense with the directionals because the instrument is connected to a remote reading station. An early example of this was installed in the Royal Navy's Admiralty building in London – the vane on the roof was mechanically linked to a large dial in the boardroom so senior officers were always aware of the wind direction when they met.
Modern aerovanes combine the directional vane with an anemometer (a device for measuring the speed of the wind). Co-locating both instruments allows them to use the same axis (a vertical rod) and provides a coordinated readout.
A challenger for the title of the world's largest weather vane is located in Whitehorse, Yukon in Canada. The weather vane is a retired Douglas DC-3 CF-CPY atop a swiveling support. Located at the Yukon Transportation Museum[18] beside Whitehorse International Airport, the weather vane is used by pilots to determine wind direction, used as a landmark by tourists and enjoyed by locals. The weather vane only requires a 5 knot wind to rotate.[19]
A challenger for the world's tallest weather vane[citation needed] is located in Westlock, Alberta. The classic weather vane that reaches to 50 feet (15 m) is topped by a 1942 Case Model D Tractor. This landmark is located at the Canadian Tractor Museum.
Slang term
The term "weather vane" is also a slang word for a politician who has frequent changes of opinion. The National Assembly of Quebec has banned the use of this slang term as an insult after its use by members of the legislature.[20]
Literary references
A copper-plated antique weathervane is the subject of the mystery in the children's book/Young Adult book entitled "The Mystery of the Phantom Grasshopper" (Trixie Belden series #18) by Kathryn Kenny, 1977. ISBN 0-307-21589-X. Paperback.
^Neumann J. and Parpola, S. (1989), "Wind Vanes in Ancient Mesopotamia, About 2000-1500BC," Bulleting of the American Meteorological Society, vol. 64, No. 10
^ abcNeedham, Joseph; Ling, Wang (1959), Science and Civilisation in China: Mathematics and the Sciences of the Heavens and the Earth, vol. 3, Cambridge University Press, p. 478
^Rossana Prestini, Vicende faustiniane, in AA.VV.,La chiesa e il monastero benedettino di San Faustino Maggiore in Brescia, Gruppo Banca Lombarda, La Scuola, Brescia 1999, p. 243
^Fedele Savio, Gli antichi vescovi d'Italia. La Lombardia, Bergamo 1929, p. hi 188
^ST PETER'S BASILICA.ORG - Providing information on St. Peter's Basilica
and Square in the Vatican City - The Treasury Museum [1]
^Bulletin of the Pennsylvania Museum. Vol. 1–5. Pennsylvania Museum of Art, Pennsylvania Museum and School of Industrial Art, Philadelphia Museum of Art. 1906. p. 14.
Bishop, Robert; Coblentz, Patricia (1981), A Gallery of American Weather Vanes and Whirligigs, New York: Dutton, ISBN9780525931515
Burnell, Marcia (1991), Heritage Above: a tribute to Maine's tradition of weather vanes, Camden, ME: Down East Books, ISBN9780892722785
Crépeau, Pierre; Portelance, Pauline (1990), Pointing at the Wind: the weather-vane collection of the Canadian Museum of Civilization, Hull, Quebec: Canadian Museum of Civilization, ISBN9780660129044
Messent, Claude John Wilson (1937), The Weather Vanes of Norfolk & Norwich, Norwich: Fletcher & Son Limited, OCLC5318669
Miller, Steve (1984), The Art of the Weathervane, Exton, PA: Schiffer Pub., ISBN9780887400056
Mockridge, Patricia; Mockridge, Philip (1990), Weather Vanes of Great Britain, London: Hale, ISBN9780709037224
Needham, Albert (1953), English Weather Vanes, their stories and legends from medieval to modern times, Haywards Heath, Sussex: C. Clarke, OCLC1472757
Nesbitt, Ilse Buchert; Nesbitt, Alexander (1970), Weathercocks and Weathercreatures; some examples of early American folk art from the collection of the Shelburne Museum, Vermont, Newport, RI: Third & Elm Press, OCLC155708
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![Weathercock on the former Thomas house [ja], Kobe, Japan](File:Weathercock_of_Former_Tohmas_House_20110313.jpg)
