Anemometer which generates an electrical contact output with a frequency proportional to wind speed.

Same as contact anemometer.

The general term for anemometers operating on the principle that the heat transfer to air from an object at an elevated temperature is a function of the air speed. Examples are the hot-wire anemometer and the katathermometer.

In meteorology, a deflecting force acting on a body in motion and resulting from the earth's rotation. It deflects air currents to the right in the northern hemisphere and to the left in the southern hemisphere, thus having an effect on wind direction.

An instrument for photographing the corona and prominences of the sun at times other than at solar eclipse.

A medium-sized instrument shelter. It is a white louvered box with a flat double to of and is mounted four feet above the ground on a four-legged stand.

The downward flux of atmospheric radiation passing through a given level surface, usually taken as the earth's surface. This result of infrared (long-wave) absorption and reemission by the atmosphere is the principal factor in the greenhouse effect.


Central Processing Unit. The part of a computer which controls and directs all functions.

Defect in the action of an aneroid barometer resulting in a sluggish adjustment of the index toward the correct reading when the barometer is subjected to a large and rapid change in pressure.

A wind blowing in a direction perpendicular to the course of a moving object.


Cathode Ray Tube. A display element, consisting of a vacuum tube and screen, used with computers.

Instrument for measuring the depth to which the soil is frozen.

Anemometer which measures wind speed by the speed of rotation of 3 or 4 hemispherical or conical cups, each fixed to the end of a horizontal arm projecting from a vertical axis. See condenser-discharge anemometer, contact anemometer. Compare to bridled-cu ...

Any one of numerous devices for the measurement of either speed alone or of both direction and speed (set and drift) in flowing water.

Generally, an instrument designed to measure or estimate the blueness of the sky. See Linke-scale.

An area of low atmospheric pressure which has a closed circulation that is cyclonic (counterclockwise in northern hemisphere and clockwise in southern hemisphere).

A constant which describes the performance of a wind vane in response to a step change in wind direction. It is calculated from the relative amount of overshoot on two successive swings (half cycles) of a decaying oscillation. This specification is dimens ...

The process by which events in the real world are translated into machine-readable signals.

The range through which the input may be varied without initiating a response. Usually expressed as a percentage of full-scale range.

A unit of pressure used principally in oceanography. One decibar (10' dynes/cm2) equals 0.1 bar. In the ocean, hydrostatic pressure in decibars very nearly equals the corresponding depth in meters.