An instrument which records the duration of sunshine and gives a quantitative measure of the amount of sunshine by the action of the sun's rays upon blueprint paper. A type of sunshine recorder.

The writing component of a recording instrument.

Clouds which cover between 6/10 and 9/10 of the sky. See Sky Terminology.

A general term for instruments designed to measure the speed or force of the wind.

The record of an aneroid barograph.

The audio-frequency signal transmitted by the Diamond-Hinman radiosonde when the baroswitch pen passes each fifteenth contact of the commutator, up to a number determined by the design of the commutator, and each fifth contact thereafter. This signal is t ...

The record or trace made by a microbarograph.

In general, any object that reflects incident energy. Usually it is a device designed for specific reflection characteristics.

The algebraic difference between the upper and lower limits of the measuring range of an instrument, i.e. a thermometer with a range of -35 to 50

Precipitation composed of balls or irregular lumps of ice with diameters between 5 and 50 mm.

Moisture contained in the soil above the water table, including water vapor which is present in the soil pores. In some cases this term refers strictly to the humidity contained in the root zone of plants.

The ratio of the output of an instrument to the input value, i.e. a rain gauge with a sensitivity of 1 tip per 0.01"

A generic term for any machine that enables a human being to communicate with a computer.

A measure, proposed by Angstrom, of the precipitation effectiveness of a region.

The temperature at which the liquid and solid forms of a substance may exist in equilibrium at a given pressure (usually one standard atmosphere). The true freezing point of water is known as the ice point.

A line of equal or constant pressure.

An atmometer consisting of a porous porcelain or ceramic container connected to a calibrated reservoir filled with distilled water. Evaporation is determined by the depletion of water in the reservoir.

A vent used with pressure sensors to reduce the effect of wind on the pressure inlet. It is normally mounted remotely and connected to the sensor using airtight tubing.

Name sometimes given to a transmissometer.

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