A windsock or wind cone is a conical
textile tubedesigned to indicate winddirection and relative wind speed. Windsocks typically are used at airports and at chemical plants where there is risk of gaseous leakage. They are sometimes located alongside highways at windy locations. Wind directionis the opposite of the direction in which the windsock is pointing (note that wind directions are conventionally specified as being the compass pointfrom which the wind originates; so a windsock pointing due northindicates a southerly wind). Windspeed is indicated by the windsock's anglerelative to the mounting pole; in low winds, the windsock droops; in high winds it flies horizontally.
At many airports windsocks are lighted at
night, either by flood lights on top surrounding it or with one mounted on the pole shining inside it.
Windsocks originated in China and Japan, where they were considered a symbol of good luck and longevity. On Children's Day they display traditional Japanese windsocks, or "
Anemometer- a device for measuring wind speed
Weather vane- a device for indicating wind direction
* [http://www.faa.gov/airports_airtraffic/airports/resources/advisory_circulars/media/150-5345-27D/150_5345_27d.pdf FAA Specification for Wind Cone Assemblies] FAA Advisory Circular 150/5345-27D (PDF 447KB)
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