Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 5

anemometer - Velocity anemometers, Pressure anemometers, Notes on wind measurements

speed air

A device for measuring the speed of a current of air, usually used to determine the speed of wind, or of a vehicle passing through air. There are three main techniques: (1) the speed of rotation of various types of windmill (eg shaped vanes or cups on horizontal arms); (2) the rate of cooling of an electrically heated wire; and (3) pressure differences developed in an open-ended tube facing the direction of the air-flow or gas stream.

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