A term used to describe a sensor (or sensors), the associated transducer(s), and the data readout or recording device.

A wooden enclosure about sixteen feet square and eight feet high with a precipitation gauge at its center. The function of the fence is to minimize eddies around the gauge and thus insure a catch that is representative of the actual rainfall or snowfall.

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

The indicating part of an instrument. For example, the hand of a watch or the meniscus of a mercury column.

A current meter consisting of six conical cups, mounted around a vertical axis, which rotate and generate a signal with each rotation. Tail vanes and a heavy weight stabilize the instrument.

A description or explanation of the manner in which the height of the ceiling is determined, i.e. aircraft ceiling, balloon ceiling. estimated ceiling, indefinite ceiling, measured ceiling, precipitation ceiling.

Name given to the unit of pressure in the International System of Units (SI). Equal to 1 newton/meter2 or 0.01 millibar.

Board that holds graph paper on which is plotted information obtained from a pilot-balloon observation.

Transistor-Transistor Logic.

The processing of the form or mode of a signal so as to make it intelligible to, or compatible with, a given device.

Electromagnetic radiation of very short wavelength. lying within the wavelength interval of 0.1 to 1.5 angstroms (between gamma rays and ultraviolet radiation). X-rays penetrate various thicknesses of all solids, and they act on photographic plates in the ...

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

A temperature telemeter.

The record of a barograph.

A type of photoelectric photometer used to measure high-altitude winds on the assumption that stellar scintillation is caused by atmospheric inhomogeneities being carried along by wind near the tropopause level.

Random Access Memory. The memory of a computer which can be read and written into at any location without passing through preceding locations.

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 ...

An instrument of the aspiration condenser type which measures the concentration and mobility of small ions.

A unit measure of electrical conduction. The facility with which a substance conducts electricity, as represented by the current density per unit electrical-potential gradient in the direction of flow. Electrical conductivity is the reciprocal of electric ...

Very generally, any moving- stream of air. It has no particular technical connotation.