The anemometer mesures the WIND SPEED. However many times the anemometer spends around in one minute will give you the RATES PER MINUTE (RPM)
We are more familiar with Miles Per Hour (MPH)
Use the formula:
RPM x 0.2142 = MPH
To calculate Knots (Beaufort Scale)
1 Knot = 1.15077945 MPH
In this picture the anemometer is connected to the Wind Vane. The wind vane tells in which direction the wind is blowing.
Question: Why would this information be useful when reporting the weather?
Resources:
http://billboyheritagesurvey.wordpress.com/
Scholastic.com
http://www.spc.noaa.gov/
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