wind and air
by john doe
The effects of wind
What instrument do weathermen use to tell the wind and air speed
- The first thing they use is called an anemometer. It usually has four small cups on sticks that catch the wind and spin in a circle, faster with stronger winds. Wind speed is derived from the speed of rotation of this propeller-like device.
A weather vane points the wind and air
flow direction. In this way, it acts like a flag.
One other interesting device is the windsock, a conical tube that indicates both wind speed and direction in a qualitative fashion. You may have seen one of these near an airport runway.
See more at near the bottom of http://www.stuffintheair.com/weathervanestore.html
under the heading "wind force measurements."Search
this site for more information now.