![]() ![]() Meanwhile, the body rests on a vertical shaft but is free to rotate about. The other end of the body extends outwards, forming a thin, arrow-like shape, called the tail. You would find a fan attached to the end of a pointed body, and each of the blades is tilted slightly so that when the wind forces them to move, the fan ends up rotating. It’s another simple anemometer that can help you to find out the wind direction and the wind speed as well.Ĭompared with the cup anemometer, they have their axes parallel to the wind direction instead of being perpendicular. > Select Right FM/AM Radio From Our List 2. Patterson’s model brought down the error percentage to less than 3 percent. He also found that the cups needed to be at an angle of 45 degrees to the direction of the wind. Later on, John Patterson in 1926 redesigned Robinson’s anemometer by removing a cup. This number obtained for wind speeds was needed as well to form a data set, for which each value corresponds to their respective wind speeds.īut matters like air resistance, cup size, and others were found to influence the result and give us false readings. As a result, the number of rotations made by the cups had to be noted down. So, the theory was that wind speed would be proportional to the rate at which the cups will be spinning. The wind put force on each cup to make the instrument spin. Specifically, he had attached four cups, and each of them was clamped vertically and connected to a wheel. John Thomas Romney Robinson, an Irish astronomer and physicist, entered the scene in 1846 to redesign the original anemometer by adding cups and wheels. ![]()
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