10 uses of a wind vane in points
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weather vane or wind vane,
instrument used to indicate wind direction. It consists of an
asymmetrically shaped object, e.g., an arrow or a rooster, mounted at
its center of gravity so it can move freely about a vertical axis.
Regardless of the design, the portion of the object with greater surface
area (usually the tail) offers greater resistance to the wind and thus
positions the vane so that the forward part points in the direction from
which the wind is blowing. The compass direction of the wind may then
be determined by reference to an attached compass rose; alternatively,
the orientation of the vane may be relayed to a remote calibrated dial.
The wind vane must be mounted at a distance from the nearest obstacle
equal to at least twice the height of the obstacle above the vane if the
observed wind direction is to be representative of meteorologically
significant wind patterns; for this reason, the vane is often mounted on
a pole or tower that is in turn mounted on the roof of a tall building.
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Nowadays, most of the wind vanes over tall building are used just as an ornamental tool but this is not what they were made for.
Wind Vanes were used as a visioning tool to find the wind direction.
They were used to determine the speed of the wind.
They were used to foretell a storm.
They were used in ships to determine an unforeseen situation.
They fixed the absence of a compass during a sea journey.
Sometime they were attached to an anemometer to determine sped and pressure of the wind.
They were used to determine wind and weather patterns.
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