A device for measuring the river stage. Also called stream gauge.

The value of the quantity measured, as indicated or otherwise provided by a measuring instrument.

The minimum temperature shown by a minimum thermometer exposed in an open situation with its bulb at the level of the tops of the grass blades of short turf.

See calorie.

A thermometer using transducing elements which deform with temperature. Examples are the bimetallic thermometer and the Bourdon tube type of thennometer.

A component of a radiosonde consisting of a series of alternate electrically conducting and insulating strips. As these are scanned by a contact the radiosonde transmits temperature and humidity signals alternately. The contact may be a baroswitch as in t ...

The stage on a fixed river gauge at which it is necessary to begin issuing warnings or river forecasts if adequate precautionary measures are to be taken before flood stage is reached.

The height of the cloud base above the local terrain.

A protocol similar to RS232 which permits data interchange on multidrop networks of up to 32 nodes using a single twisted pair cable. In order for this protocol to be used, each device on a network must have some level of intelligence in order establish o ...

Sir Napier Shaw's name for the approximate absolute temperature scale,

The range through which the input may be varied without initiating a response. Usually expressed as a percentage of full-scale range.

Name sometimes given to a transmissometer.

Wind with a speed between 17 and 21 knots (19 and 24 mph); Beaufort scale number 5.

A type of electrical thermometer in which the thermal element is a substance whose electrical resistance varies with the temperature. Such thermometers can be made with very short time constants and are capable of highly accurate measurements.

See instrument error, observational error. random error, standard error, systematic error.

Same as geostrophic wind level.

An instrument used to measure the water vapor content of the air.

The flux of visible radiation, so weighted as to account for the manner in which the response of the human eye varies with the Wavelength of radiation. The basic unit for luminous flux is the lumen,

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

An automatic, recording cloud height indicator.