Chapter 7. Meteorology (Weather)
Purpose: The anemometer is used to measure wind speed from any direction. The weather bureau uses one with three cups. As these cups turn, a dial connected electrically to the anemometer shows the wind speed to the weatherman inside the weather station.
Materials: Milk carton, four paper cups, medicine dropper or short piece of glass tubing, staples or paper clips, and a board with a large nail for the base.
What to Do: Cut the four corner strips off a milk carton as shown with the dotted lines. Slip the folded ends of each pair of strips together. This should make two long strips. Lay one of the long strips on the table. Place the glass part of an eyedropper or a sealed end of a piece of glass tubing ...