wind vane


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weather vane

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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wind vane

[′win ‚vān]
(engineering)
An instrument used to indicate wind direction, consisting basically of an asymmetrically shaped object mounted at its center of gravity about a vertical axis; the end which offers the greater resistance to the motion of air moves to the downwind position; the direction of the wind is determined by reference to an attached oriented compass rose.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

wind vane

A device to indicate wind direction. A wind vane always points into the wind. It works on the principle of weathercocking. See weather vane.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Richard is equally fond of cupola attachments: lightning rods, balls, wind vanes or arrows, directionals (fixed indicators of N-S-E-W directions) and pendants (ornamental glass pieces hung from lightning rod holders).
The same computer also takes constant note of the current wind speed, from an anemometer mounted next to the wind vane. It adjusts the angle of attack of the rotor blades for efficiency and to keep the speed of rotation within safe limits.
Step 4: Punch a small hole in the bottom middle of your wind vane.
On the ceiling of the cupola is beautiful painted sky scene and golden wind vane.it is not the original dome as that had long since disappeared but the trust knew one existed as joists could still be seen and it was also included in James Corbridge's map of Newcastle dating back to 1723.
Each day, write down your observations from your wind vane and barometer too.
(Lightweight cardboard can also be used instead of index cards.) They can either hold their wind vane, push it into the ground, or push it into an upside down styrofoam cup stuck down to any flat surface with modeling clay.
You can hold your wind vane or push the pencil into the ground Use a compass to check direction.