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WX4PG / A Guide to Weather Vane

The following information on weather vanes has been added at the request of the members of Boy Scout Troop 325, in Lake Jackson, Texas.
Their website can be viewed here.

A Guide to Weather Vanes

The ability to forecast the weather has been, and continues to be, important for a variety of reasons. Today, satellites, computers, and advanced technology make it simple to predict weather conditions. In the past, however, people did not have the benefit of this technology and had to turn to other means of predicting what the weather would bring. To do that, people depended on a much simpler form of technology called weather vanes. Weather vanes are relatively simple devices that are used to show the direction of the wind. Although they are predominantly used for decorative purposes in modern society, they do have an interesting and lengthy history as a functional instrument that performed a very important service.

Weather vanes are far from being a modern technology. Their history dates back centuries, with the first recorded evidence of a weather vane going back to 48 B.C. It is believed that this device was built by an astronomer named Andronicus and was placed on the Tower of the Winds in Athens in honor of Triton, the Greek god. In fact, weather vanes during ancient times often depicted Greek or Roman gods. Vikings also used weather vanes on their ships. European churches began to put weather vanes with roosters on churches during the 9th century A.D. at the behest of the pope. Fabric was used to monitor the wind during medieval times, when archers would watch the flapping of flags. In the United States, a notable weather vane was commissioned by George Washington. It was called "Dove of Peace" and was meant to commemorate the ending of the Revolutionary War.

When researching weather vanes, one will frequently encounter the term "wind vane." Wind vanes and weather vanes perform the same task of showing the direction of the wind. These devices are traditionally placed high on top of structures such as barns or churches. They are mounted in locations that are up high so that they are a good distance away from anything that can create a false wind, such as machinery, cars driving by, aircraft, or other man-made sources that can stir up the air. They are a relatively simple device to make, although care must be taken for accurate results. Weather or wind vanes are made so that they are an ornament atop a rotating rod. The rotating rod is situated on a fixed rod. Some weather vanes may have directionals or symbols that denote north, south, east, and west or simply north and south. The directionals typically are attached to the fixed rod. The ornament is located near the top of the weather vane and is situated on the rotating rod. The ornament must be made so that it is of equal mass on both sides of the rod; however, the ornament must have one side that is shorter and smaller than the other. Typically, one end of the ornament is shaped like a pointer or arrow or it comes to some form of point. On the other end of the ornament, it will be wider. When the wind blows, the pointed end is the part that turns into the wind, while the opposite, wider part is caught by the breeze. The blowing wind causes the ornament to pivot, causing the pointed end to point in the direction of the wind. This means if the wind is blowing from the north, the arrow will point north.

There are many different styles when it comes to weather or wind vanes. People can use their imaginations in finding the ideal style for them; however, there are some basic styles to consider. One of the more common styles consists of an arrow on one end and scrollwork on the opposite wider/longer end. Another version of that style includes an arrow and banner in place of the scrollwork. Some weather vanes use silhouettes of animals, full-bodied ornaments depicting animals, or swell-bodied ornaments. Common animals depicted on weather vanes include horses, roosters, or other birds. Historically, weather vanes were cast from iron, bronze, or zinc; however, today's hand-made weather vanes typically use aluminum, which is lighter than the previously mentioned materials. Machine- or mold-crafted weather vanes are often made using copper.

Click on any of the following links to learn more about weather vanes:

Author: Alan Bernau Jr


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