An instrument for measuring temperature by utilizing the variation of the physical properties of substances according to their thermal states. Thermometers may be classified into types according to their construction; deformation thermometer, electrical t ...

The part of a measuring instrument which responds directly to changes in the environment.

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

Same as fogbow.

An instrument for recording global solar radiation.

An instrument for determining the direction of cloud motion. There are two basic designs of nephoscope, the directvision nephoscope and the mirror nephoscope.

See calorie.

Temperature to which absolutely dry air would have to be brought in order for it to have the same density as moist air, considered at the same pressure.

Precipitation caused by the ascent of moist air over an orographic barrier such as a Mountain range.

A wind blowing in a direction perpendicular to the course of a moving object.

An instrument used for measuring geometric angles. See radio direction-finder.

A curve showing the variation of temperature with height in the free air. See lapse rate.

The depth of water that would result from the melting of snow or ice, assuming measurement on a horizontal surface and no infiltration or evaporation.

See radar theodolite, radio direction-finder.

The level at which ice crystals and snowflakes melt as they descend through the atmosphere.

The statement that the viscosity of air is independent of the density of air.

Any device or instrument for measuring salinity, especially one based on electrical conductivity methods.

An aneroid barometer arranged so that the deflection of the aneroid capsule actuates a pen which graphs a record on a rotating drum. Sometimes called aneroidograph.

The temperature at which a solid substance undergoes fusion, i.e. melts, changes from solid to liquid form. All substances have their characteristic melting points. For very pure substances the temperature range over which the process of fusion occurs is ...

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