The change in the measured transducer output caused by changes in ambient temperature. Usually expressed a percentage of full scale.

The correctable part of the inaccuracy of an instrument.

A thermometer with a muslin-covered bulb which is moistened. used to measure wet-bulb temperature.

Upwarddirected solar radiation, reflected by the earth's surface and the atmosphere.

The distance that an observer can see vertically into a surface-based obscuring phenomenon such as fog, rain, or snow. The distance estimate must be based upon ceiling balloon ascensions or ceiling light projector measurements.

See radar theodolite, radio direction-finder.

A special type of radar target, usually a comer reflector, tied beneath a free balloon and designed to be an efficient reflector of radio energy.

A set of regulations set down by the U.S. Civil Aeronautics Board to govern the operational control of aircraft on instrument flight. The abbreviation of this term is seldom used to denote the rules themselves, but is in popular use to describe the weathe ...

A thermometer which uses a transducing element whose element proper-ties are a function of its thermal state. Common meteorological examples of such thermometers are the resistance thermometer and the thermoelectric thermometer.

The minimum temperature shown by a minimum thermometer exposed in an open situation with its bulb at the level of the tops of the grass blades of short turf.

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

A liquid-in-glass or liquid-in-metal thermometer using mercury as the liquid.

Generic term for rapid variations in apparent position, brightness, or color of a distant luminous. object viewed through the atmosphere.

A refraction phenomenon similar to a parahelion, but occurring generally at a distance of 120

A device, similar to a potometer, for measuring transpiration, consisting of a vessel containing soil in which one or more plants are rooted and sealed so that water can escape only by transpiration from the plant.

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

Not a linear function of the relevant variables.

Apparatus consisting of (a) standard radiosonde and radiosonde ground equipment to obtain upper-air data on pressure, temperature, and humidity, and (b) a self-tracking radio direction-finder to provide the elevation and azimuth angles of the radiosonde s ...

Random Access Memory. The memory of a computer which can be read and written into at any location without passing through preceding locations.

In nautical terminology, a contraction for "weather glass" (a mercury barometer).