The final result should appear to have four equally spaced and perpendicular holes near the rim of the center cup.
Do this same procedure with another straw and another cup with one hole punched in it. [5] X Research source Afterward, you should have to cups with two straws coming out from their sides.
Repeat this step with the other cup and attached straw. [7] X Research source
Make sure that the two cups on each end of the straws are facing in opposite directions. When all the cups are added to the ends of the straws, all openings of the cups should be facing the same direction. [9] X Research source
Be sure that you don’t push the pin in as tight as it will go, otherwise the anemometer won’t spin when exposed to wind. [11] X Research source Push the pushpin in just enough so the straws stay connected to each other and the pencil eraser.
