This device is especially suited for the measurement of low airspeeds. In another type of wind-driven unit, revolving vanes operate a counter, the revolutions being timed by a stopwatch and converted to airspeed. A propeller may also be used to drive the electric generator, as in the propeller anemometer. The useful range of this device is approximately from 5 to 100 knots. The output of the generator operates an electric meter that is calibrated in wind speed. Most widely used for wind-speed measurements is the revolving-cup electric anemometer, in which the revolving cups drive an electric generator. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!Īnemometer, device for measuring the speed of airflow in the atmosphere, in wind tunnels, and in other gas-flow applications.Learn about the major environmental problems facing our planet and what can be done about them!
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