An aneroid barometer arranged so that the deflection of the aneroid capsule actuates a pen which graphs a record on a rotating drum. Sometimes called aneroidograph.

A barometer which measures atmospheric pressure using one or a series of aneroid capsules. Also called holosteric barometer.

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

The record of an aneroid barograph.

An absolute instrument developed by K. Angstrom for the measurement of direct solar radiation. The radiation receiver station consists of two identical manganin strips whose temperatures are measured by attached thermocouples. One of the strips is shaded, ...

An instrument developed by K. Angstrom for measuring the effective terrestrial radiation. It consists of four manganin strips, of which two are blackened and two are polished. The blackened strips are allowed to radiate to the atmosphere while the polishe ...

A conductor or system of conductors for radiating and/or receiving radio energy. Also called aerial.

See feed.

See gain.

Same as radiation pattern. Anticyclone-An area of high atmospheric pressure which has a closed circulation that is anticyclonic (clockwise in northern hemisphere and counterclockwise in southern hemisphere).

In Jeffreys' classification, a wind for which the pressure force exactly balances the viscous force, in which the vertical transfers of momentum predominate.

Same as freezing point.

A temperature scale with the ice point at 273 degrees and boiling point of water at 373 degrees. It is intended to approximate the Kelvin temperature scale with sufficient accuracy for many sciences, notably meteorology.

See standard atmosphere.

American Standard Code for Information Interchange. A standard code used to represent data using 8 bits (7 data bits and I parity bit) per character.

Automated Surface Observing System. A network of instrumented weather stations deployed primarily by the National Weather Service to make weather observations without operator involvement.

An instrument, for the recording of two or more meteorological parameters, in which the ventilation is provided by a suction fan.

A psychrometer in which the ventilation is provided by a suction fan.

A thermograph in which ventilation is provided by a suction fan.

A device attached to a meteorological instrument to provide ventilation; usually a suction fan.