This device to measure wind speed is made from corrugated cardboard. A discarded cardboard box will do the job. Cut the box so it will lay flat on a table.
Mark off four 3 inch sections and a ½ inch section for an over lap to enclose one side of the box tube.
Crease along the corrugations using a ruler for a straight edge and the handle of a spoon .
Fold the cardboard at the creases to make the box tube and glue the ½ inch over lap to the 4th side.
Follow the plan below to complete the wind speed indicator.
To calibrate the anemometer requires two people. Choose a
still day with no wind, early morning is best.
Have a friend drive a car at low speed, about 10 MPH . Place your anemometer into the wind and mark the area
the needle is steady at for 10 MPH. Increase the car speed to 20 MPH and mark the area as 20 MPH.
Continue up the speed range and mark off the speeds. Stay with in the road rules and donít exceed the speed limit.
Now with the anemometer calibrated you can measure the wind speed
at ground level as wind speed will be different
at higher altitudes.
When you take a reading, first hold the anemometer level by holding your hand over the opening and move the box tube until you have the needle at rest on zero. Remove your hand and point the anemometer into the wind.