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

Same as photometer.

A type of climatic diagram whose coordinates are some form of temperature vs. a form of humidity or precipitation.

A thermograph in which ventilation is provided by a suction fan.

A pressure-operated switching device used in a radiosonde. In operation, the expansion of an aneroid capsule causes an electrical contact to scan a radiosonde commutator composed of conductors separated by insulators.

Read Only Memory. A memory that cannot be altered in normal use of a computer, Usually used to store information permanently, such as firmware programs.

The total of all deviations of a transducer's output from a specified straight line in a constant environment.

An instrument for the measurement of the net flux of downward and upward total (solar and terrestrial) radiation through a horizontal surface.

An instrument which measures combined direct solar radiation and diffuse sky radiation. See pyrheliometer, Robitzsch actinograph. solarimeter. See also albedometer.

General name for an instrument designed to measure the vertical component of the wind speed. See anemoclinometer.

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

A chronograph used to make a time-record of certain measured meteorological elements. The most common type, the triple register, records wind direction and speed, duration of sunshine, and amount of rainfall (sensed respectively by a contact anemometer, M ...

The actual time during which physical events take place.

Abbreviation for precipitation-evaporation quotient.

A thermometer which utilizes the thermal properties of gas. There are two forms of this instrument: (a) a type in which the gas is kept at constant volume, and pressure is the thermometric property, and (b) a type in which the gas is kept at constant pres ...

A unit of pressure equal to 10' dyne per cm-' (101 barye), 1000 millibars. 29.53 inches of mercury.

A balloon used to carry a radiosonde aloft, considerably larger than pilot balloons or ceiling balloons.

The inherent imprecision of a given process of measurement, the unpredictable component of repeated independent measurements of the same object under sensibly uniform conditions.

Same as instrument shelter.

A thermometer, invented by James Six in 1782, which simultaneously indicates the maximum and minimum temperatures attained during a given interval of time. A U-tube min/max thermometer