A thermometer. the sensitive element of which consists of two metal strips which have different coefficients of expansion and are brazed together. The distortions of the system in response to temperature variations are used as a measure of temperature. It ...

A mercury-in-glass thermometer which records the temperature upon being inverted and retains its reading until being returned to the first position.

An instrument for measuring the intensity of direct solar radiation at normal incidence. See Angstrom compensation pyrheliometer, Eppley pyrheliometer, Michaelson actinograph. silver- disc pyrheliometer, spectropyrheliometer, waterflow pyrheliometer.

See aneroid capsule.

A graphical aid used in the reduction of data from a winds aloft observation.

The record made by a hygrograph.

Name sometimes given to a transmissometer.

The upper surface of a column of liquid.

The record or trace made by a microbarograph.

An aneroid barograph designed to record atmospheric pressure variations of very small magnitude.

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

check chamber-A chamber use to check the sensing elements of radiosonde equipment.

A device for obtaining a continuous record of stage at a point on a stream. The most common recorders consist of a float-actuated pen which traces a record on a clock driven chart.

The standard deviation (positive square-root of the variation) of the errors associated with physical measurements of an unknown quantity, or statistical estimates of an unknown parameter or of a random variable.

A set of electrical conductors, often on a backplane, that carry data and power signals among the various components of a computer.

An air-launched balloon designed to be released in the eye of a tropical cyclone, float within the eye at predetermined levels, and transmit radio signals for RDF positioning.

modulated radiosonde-A radiosonde which transmits the indications of the meteorological sensing elements in the form of pulses spaced in time. The meteorological data are evaluated from the intervals between the pulses. Also called timeinterval radiosonde ...

Operation mode of a communication circuit in which each end can transmit and receive, but not simultaneously.

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 ...

The meteorological visual range, which can be estimated from the average extinction coefficient using the Koschmieder equation.