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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site anemometer An instrument for measuring the force or velocity of wind. There are various types: A cup anemometer, like that shown in the photo here, is used to measure the wind speed from the speed of rotation of a windmill which consist of 3 or 4 hemispherical or conical cups, each fixed to the ends of horizontal arms attached to a vertical axis. A Byram anemometer is a variety of cup anemometer. A counting anemometer has cups or a fan whose rotation is transmitted to a counter which integrates directly the air movement speed. A hand anemometer is small portable anemometer held at arm's length by an observer making a wind speed measurement. A pressure tube anemometer (Dines anemometer) is an instrument that derives wind speed from measurements of the dynamic wind pressures. Wind blowing into a tube develops a pressure greater than the static pressure, while wind blowing across a tube develops a pressure less than the static. This pressure difference is proportional to the square of the wind speed. Related categories    • WIND POWER    • TOOLS Source: National Snow and Ice Data Center Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP