Now I go back to my small days. I was a 9-year-old kid when I heard the first weather forecast. When the weather forecast reader said about the wind speed, I wondered, “how they measure the wind speed?” The wind is something that you cannot see, you only feel it. So, you can’t watch it and measure its speed. Fortunately, now we have the instrument called the Anemometer to measure the wind speed.
Just before giving you instructions on making your own Anemometer, Let’s see how this simple yet useful instrument works. Well, I am talking about the simple cup meters. When the wind blows hitting the cups, the cups turns and by counting the number of rotations for a given time period; the wind speed is calculated. OK, now you have many types of Anemometers available thanks to the modern technology (vane anemometers, mechanical anemometers, ultrasonic anemometers, laser interferometer anemometers, and Doppler laser anemometers.)
Well, there was a sort of an Anemometer structure in one of the neighbor’s house (I am talking about my old days,) and I used to look at it often. When the wind blows fast, I was worried that it would rotate dangerously fast. You might think the same about large wind turbines. Don’t worry. They have fitted brakes to stop spinning if the wind blows fast. Also, a fitted Anemometer measures the wind speed as well.
OK, now will see the way of making your own Anemometer. I am starting with the materials.
* Five paper cups (three-ounce is better.)
* A sharpened pencil or a paper hole.
* A pencil with the eraser.
* Two straws.
* Water bottle.
Procedure: Well, it’s not rocket science.
* Make holes in the sides of each cups (4 cups only) with the sharpened pencil or the paper punch.
* So, you have one cup remaining. Make 4 holes around the rim (evenly spaced.) It’s going to be the center of your Anemometer.
* Slide the two straws through the holes made in the 4 cups in an X shape (with the 5th cup in the center.)
* So, now you have a structure as shown in this picture (https://cdn.education.com/files/620001_621000/620680/make-anemometer-350×440.jpg.)
* Using the pin, fix the structure onto the pencil with the eraser. So, now you have a structure as shown in this picture (https://hec-r.s3.amazonaws.com/Site/prod/contentplayer/templates/kids/images/anemometer.jpg.)
* Well, that’s it. Now put the whole structure into the empty water bottle (https://cdn.education.com/files/static/science-fair/make-anemometer/anemometer-diagram.png.)
OK, it’s a very simple Anemometer. You can make it for your kids for fun.
Observations and results: Well, if the wind blows so fast, the bottle will fall off. You can hold the bottle from the bottom to prevent falling due to the fast-blowing wind. Observe the change in rotating speed relative to the wind blowing speed. If you take your hand-made Anemometer to the beach, probably in might fail. The reason because the wind blows very fast near the beaches.
Use your imagination and creativity. You can build something robust and similar to a real Anemometer. I came across this pdf (http://www.met.ie/education/pdfs_eng/Lesson%20Plan%20Measuring%20and%20Recording%20Wind%20Speed.pdf,) and it gives you useful information about measuring and recording wind speed. Just read it as well.