To make an anemometer you have :
The first thing that you've got to do is to to cut some dowelling.
Second you have to put the protactor with glue gun on the dowelling.
Third you have to put the little dowelling with glue gun on the protactor.
Fourth to make a hole in the dowelling.
Fifth to put the fishing line in the hole.
Sixth you have to make a hole in the pin pong ball and to put the fishing line in the hole of the ping pong ball.
To help you to put the fishing line in the ping pong ball you can use a needle.
You have to put the sprit level on the top of the dowelling with the glue gan.
After this you are finished.