Weathervane

Weathervane is a device which is used to predict the direction of wind. It is a movable device which is attached to any elevated object mostly roof. They are balanced in such a way that half of its weight is on either side of its axis and the areas exposed to air on both sides are unequal. It minimizes the force of wind and cause vane to rotate.

They are also known as wind vane. There are various shapes of wind vane. Most popular shapes are arrows and cocks. Cock shaped weather vanes are also known as weather cocks. They have fanciful shapes and unable to show the real direction of the very gentle wind. It is because the design unable to achieve the required balance.

The weathervane must be located enough distance above the ground and it must be away from buildings, trees, and other objects those can interfere with the true wind direction. You can get accurate readings by following these guide lines. Modern wind vanes have simple arrows that mete out with the directional because Vane is connected with remote reading station.

Design of the weathervane causes the end with minimum area to turn into the wind and pointing to the source of the wind. Winds are named from their source direction so pointer enables the spectator to name the wind effortlessly. Some weather vanes have directional markers. They are aligned with geographical directions.