A balloon-borne instrument for the simultaneous measurement and transmission of meteorological data. It includes transducers for the measurement of pressure, temperature, and humidity; a modulator for the conversion of the output of the transducers to a q ...

A device used to hold liquid-in-glass maximum and minimum thermometers in the proper recording position inside an instrument shelter, and to permit them to be read and reset. See Townsend support.

Barometer in which pressure is determined by balancing air pressure against the weight of a column of mercury in an evacuated glass tube.

Value of soil moisture, expressed as a percentage of the mass of dry soil, below which a plant living in the soil dies by wilting.

A device used on certain types of instruments to prevent unwanted radiation from affecting the measurement of a quantity. Also called solar radiation shield.

A rainbow of angular radius of about 50

An instrument which measures the spectral distribution of the intensity of direct solar radiation.

Same as instrument shelter.

An instrument for measuring the difference of the solar radiation falling on both sides of a horizontal surface from the whole hemisphere.

A rain gauge which automatically records the amount of precipitation collected, as a function of time.

A measure of the amount of "spin" (or rotation) in the atmosphere.

The lowest value of a measured quality at which a sensor responds. Compare to tracking.

Same as photometer.

Any one of six gases, helium, neon, argon, krypton, xenon, and radon, all of whose shells of planetary electrons contain stable numbers of electrons such that the atoms are chemically inactive.

Any source of radiant energy, especially electromagnetic energy.

A diagram showing the intensity of the radiation field in all directions from a transmitting radio or radar antenna at a given distance from the antenna.

An instrument for measuring the difference between incoming and outgoing terrestrial radiation.

Same as rain-intensity gauge.

A generic term for any machine that enables a human being to communicate with a computer.

The ratios, to the mean wind speed, of the average magnitudes of the component fluctuations of the wind along three mutually perpendicular axes.