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

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

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 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 common unit used in measurement of atmospheric pressure. Defined as that pressure exerted by a one-inch column of mercury at standard gravity and a temperature of 0'C.

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

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

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.

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

The correctable part of the inaccuracy of an instrument.

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

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

Not a linear function of the relevant variables.

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.

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.

The process by which small particles suspended in a medium of a different refractive index diffuse a portion of the incident radiation in all directions. In scattering no energy transformation results, only a change in the spatial distribution of the radi ...

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.

See standard atmosphere.

Occupational Safety and Health Administration. A regulatory office of the U.S. Department of Labor.