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

A recording anemometer.

A small balloon, loaded with ballast and inflated so that it will explode at a predetermined altitude, which is attached to a larger balloon.

Lacking a relationship to a time base or clock. In asynchronous communications, individual data characters are sent at an arbitrary rate.

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 ...

A unit of energy equal to 101 ergs or to 0.2389 calories.

An instrument of the aspiration condenser type which measures the concentration and mobility of small ions.

Physical equipment used in data processing. Compare to firmware, software.

The direction from which the wind is blowing, measured in points of the compass or in azimuth degrees.

Same as ceiling light.

The record of an aneroid barograph.

Temperature of equilibrium between the liquid and vapor phases of a substance at a given pressure.

A balloon designed to float at a constant pressure level. This may be accomplished by a pressure valve which controls the release of ballast so as to maintain flight above a selected pressure level until the supply of ballast is exhausted. See Moby Dick b ...

An instrument for measuring angles of inclination. Used in conjunction with a ceiling light to measure cloud height at night.

Readily taking up and retaining moisture.

Reduction of visibility by strong winds blowing across dry ground with little or no vegetation. Visibilities of 1/8 mile or less over a widespread area are criteria for a Blowing Dust Advisory.

A thin metal disc partially evacuated of air used to measure atmospheric pressure by measuring its expansion and contraction.

A severe weather condition characterized by low temperatures and strong winds bearing a great amount of snow, either falling or picked up from the ground.

A colloquial term in western Australia for a squall, associated with thunder, on the northwest coast in summer.

A recording variometer.