Anemometer

Measures wind speed.

http://education.nationalgeographic.com/education/encyclopedia/anemometer/?ar_a=1

http://footage.shutterstock.com/clip-1342036-stock-footage-a-closeup-anemometer-spinning-against-bokeh-green-background.html

http://c03.apogee.net/contentplayer/?coursetype=kids&utilityid=novec&id=16244

http://teacher.scholastic.com/activities/wwatch/gather_data/anemometer.htm

http://ciese.org/curriculum/weatherproj2/en/docs/anemometer.shtml


http://www.ehow.com/how_5892682_make-anemometer-children.html

http://www.youtube.com/watch?v=BTQFgnnkVUc