A type of electrical thermometer consisting of two thermocouples which are series-connected with a potentiometer and a constant-temperature bath. One couple, called the reference junction, is placed in a constant-temperature bath, while the other is used ...

An instrument for measuring radiant energy. See actinometer, Dines radiometer, photometer, Tulipian radiometer.

A sounding balloon which, when operationally inflated, resembles an inverted teardrop.

An instrument for the measurement of the radon content of the atmosphere.

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

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

Same as wave pole.

A form of data transmission in which the bits of each character are all sent simultaneously, resulting in extremely fast communication but requiring a communication path for each bit. Compare to serial data transmission.

Same as instrument shelter.

That temperature at which, in a specified latitude, the reading of a particular barometer requires no temperature or latitude correction.

The maximum positive and negative deviation observed in testing a device under specified conditions and by a specified procedure. It is usually measured as an inaccuracy and expressed as accuracy, typically in terms of the measured variable, percent of sp ...

An instrument for measuring the extinction coefficient in water.

Same as humidity strip.

Wind with a speed between 22 and 27 knots (25 and 31 mph); Beaufort scale number 6.

Same as photometer.

A photometric unit of illuminance or illumination equal to one lumen per square meter

Balance of the water resources of a region, comparing precipitation and inflow with outflow, evaporation, and accumulation.

A thermometer used in aircraft which automatically corrects for adiabatic and frictional temperature rises by imparting a rotary motion to the air passing the thermal sensing element.

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

The measurement and computation of wind speeds and directions at various levels above the surface of the earth. Methods include pilot balloon observations, rabals, rawin or rawinsonde observations, radar tracking, or acoustic sounding.