Staple one of the cups to the end of each of the straws. Note: Some forces are being ignored including drag and friction for this elementary illustration, so the velocity at which your anemometer spins is not the same as wind speed. Wind Speed Anemometer Lay out the straws into a cross shape and tape them together. Your anemometer doesn’t need to be pointed in the wind for use. A WIND SOCK is a conical textile tube, which resembles a giant sock, designed to indicate wind direction and relative wind speed. Multiply your RPM value by the circumference of the circle and you will have an approximation of the velocity of at which your anemometer spins (in feet per minute). How To Make An Anemometer STEP 1: Use the hole puncher to make two holes across from each other, in each of your cups. The cups catch the wind, turning a dial attached to the instrument. Next, calculate the circumference (in feet) of the circle made by the rotating paper cups. As the wind blows, they catch the wind and begin to spin around the axis. This instrument uses three or four cups mounted on a vertical pole (axis) and all facing the same direction. There are a few different types of anemometers, but the cup anemometer is the most basic. To calculate the velocity at which your anemometer spins, determine the number of revolutions per minute (RPM). An anemometer is an instrument used to measure wind speed. Push the pin into the end of the pencil eraser as far as it will go.Īn anemometer is useful because it rotates with the wind. Push the eraser end of the pencil through the bottom hole in the center cup. ![]() Push the straight pin through the two straws where they intersect. Repeat this procedure using the other cup and straw assembly and the remaining one-hole cup.Īlign the four cups so that their open ends face in the same direction either clockwise or counter-clockwise around the center cup. Push another one-hole cup onto the end of the straw just pushed through the four-hole cup.īend the straw and staple it to the one-hole cup, making certain that the cup faces the opposite direction from the first cup. Slide one cup and straw assembly through two opposite holes in the cup with four holes. Scientists use anemometers to measure wind speed. ![]() Repeat this procedure for another one-hole cup and the second straw. Kids will love creating their own patterns and experimenting to find which objects work best. Fold the end of the straw and staple it to the side of the cup across from the hole. Take one of the four cups and push a soda straw through the hole. Find many great new & used options and get the best deals for DIY Student Anemometer Science Handmade Wooden Weathervane Kit For Kids Toy Gift at the best. Then punch a hole in the center of the bottom of the cup. Take the fifth cup and punch four equally spaced holes about a quarter inch below the rim. ![]() Take four of the Dixie Cups and use the paper punch to punch one hole in each, about a half inch below the rim.
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