In folklore, a name for wind.

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

A conically shaped, copper rain gauge shield.

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

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.

The distance or length of flow of the air past a point during a given interval of time.

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

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

An instrument used for the determination of the electrical conductivity of the atmosphere.

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 ...

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.

A cup anemometer with its shaft mechanically coupled to a magneto.

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 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 power supply which achieves its output regulation by means of one or more active power handling devices which are alternately placed in the "off" or "on" states. It is more efficient than linear supplies which vary the conduction of power devices to ach ...

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

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 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 ...

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

Not a linear function of the relevant variables.