A type of hygrometer which measures the water vapor content of the atmosphere by means of the absorption of vapor by a hygroscopic chemical.

Same as aneroid barometer. Holostelic means wholly made of solids, while aneroid means devoid of liquid.

Same as photometer.

An instrument designed to measure quantities of heat. Sometimes used in meteorology to measure solar radiation.

A device that allows a terminal or computer at one location to communicate with a terminal or computer at a distant location via wire or phone lines.

Amount of solar radiation incident, per unit area and time, on a surface which is perpendicular to the radiation and is situated at the outer limit of the atmosphere, the earth being at its mean distance from the sun. It equals approximately 2.00 ly/ min ...

A common type of liquid-inglass thermometer, used, in meteorology, in psychrometers and as a maximum thermometer.

A rain gauge which is placed under trees or foliage to determine the rainfall in that location. By comparing this catch with that from a rain gauge set in the open. the amount of rainfall which has been intercepted by foliage can be determined.

The limiting values of ceiling, visibility, and wind, or runway visual range, established as safety minimum for aircraft landings and take-offs.

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

A small pointer extending downward from the top of the cistern of a Fortin barometer. The level of the mercury in the cistern is adjusted so that it just comes in contact with the end of the pointer, thus setting the zero of the barometric scale.

An instrument which measures the effective terrestrial radiation. See Angstrom pyrgeometer.

An instrument for the measurement of the rate of ice accretion on an unheated body.

Sir Napier Shaw's name for the approximate absolute temperature scale,

Solar radiation scattered by particles in the atmosphere.

In a system of moist air, the ratio of the mass of water vapor to the total volume of the system. Usually expressed as grams per cubic meter (g/m3).

Snow gauge composed of a metal cylinder, closed at one end, used to obtain a sample of snow from which the water is measured after melting.

Diffuse solar radiation which has the same intensity in all directions.

Name sometimes given to a transmissometer.

Wind with a speed between 28 and 33 knots (32 and 38 mph); Beaufort scale number 7.