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Weathervanes may appear a simple decoration for the outside of your home. However, they are in fact a rather complicated piece of engineering.
The very first recorded use of a weather vane as an instrument was in the 1500s. They have since become an English tradition decorating homes and boat harbors. Also called wind vanes, these instruments are attached to a roof or top of a building to calculate wind direction. This can make them particularly useful for sailors, farmers, and hunters.
Weathervanes – The basics
Each device sits loosely on an axis and evenly weighted. Therefore, when the wind blows, it spins around and its arrow displays the direction of the wind. At the base of the vane the geographic north, south, east, and west are displayed to make reading easier. Placed around 10 meters high, and away from the obstruction, a weather vane can give a very accurate reading.
For the average homeowner, the use of a weather vane might seem a little redundant. However, when the wind direction is read and compared with the type of clouds or the color of the sky, a weather prediction can usually be made. For example, if you live in the Northern Hemisphere, the sky in the morning is red, the clouds are low and the wind is blowing south then a storm may be on its way.
A weather vane used as both a practical device and a decoration can boast a figurine on its axis, typically a cockerel, and they are most commonly made from metal such as wrought iron, brass, or copper. The main reason for a weather vane being crafted from such materials is that they are constantly subjected to all kinds of weather extremities and cannot afford to rot or fall apart.
Other figurines placed on a weather vane include ships, eagles, foxes, and simple arrows. Professionally designed and crafted wind vanes can be very aesthetically pleasing, for example when the sun reflects off a brass figurine and it spins when a light breeze passes by.
With some weathervanes, it is also possible to calculate the wind speed. To do this the vane must have an anemometer which comprises of four cups turned on their sides or a windmill which spins round continuously. Counting how many turns the cups/windmill make(s) over a set amount of time produces an average wind speed. This is of course is quite a dated and complex method of finding out wind speed. Now, wind vanes can be connected to a reading station to find this information out.
Placing a weather vane on a house can not only provide a beautiful focal point for a boring slate roof but also a fun and hands-on means to teach young children the geographical directions and what the wind can tell you about the weather. Overall they are a great investment to brighten up your house whilst providing a practical use.
We touched upon the importance of learning to read the weather in our article. Rural Living: 15 Useful Tips For Your New Life
A more advanced option could be a Davis Instruments 6250 Vantage Vue Wireless Weather Station
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