Materials

• 4 small paper cups 
• tape 
• scissors 
• 4 plastic drinking straws 
• straight pin 
• pencil with a new eraser 
• stapler 

 Procedure 

• Arrange four plastic drinking straws to form a cross and tape them together at the center. 
• Staple the top side of one drinking cup, such as the small paper Dixie cups designed for bathroom dispensers, to the end of each straw, so that the open ends of the cups all face in the same direction.Push a straight pin through the center of the straws into an eraser on the end of a pencil. This provides the axle. 
• Blow on the anemometer or turn an electric fan on low to make sure that it spins easily.