A liquid-in-metal thermometer in which mercury is enclosed in a steel envelope. The change in internal pressure caused by the temperature variation is measured by a Bourdon tube which is connected to the mercury by a capillary tube. This instrument is hig ...

An instrument for photographing the corona and prominences of the sun at times other than at solar eclipse.

A protective coating applied to circuits.

A subtle, diumal component of the wind velocity leading to a diumal shift of the wind or turning of the wind with the sun, produced bv the east-to-west progression of daytime surface heating.

In the direction from which the wind is blowing.

The rising of cold water from the deeper areas of the ocean to the surface. This phenomena often occurs along the California coast during the spring and summer.

An instrument for recording ocean waves. Most recorders are designed for recording wind waves, that is waves of periods up to about 25 seconds, but some are designed to record waves of longer periods such as tsunamis or tides.

An instrument which indicates the presence of precipitation. The ombroscope consists of a heated, water-sensitive surface which indicates by mechanical or electrical techniques the occurrence of precipitation.

The process by which events in the real world are translated into machine-readable signals.

A definite portion of a stream channel, commonly taken between two gauging stations, but may be taken between any two specified points.

American Standard Code for Information Interchange. A standard code used to represent data using 8 bits (7 data bits and I parity bit) per character.

An instrument for the measurement of both solar and terrestrial radiation.

A clockwise change in wind direction. Veering winds with height are indicative of warm air advection (WAA).

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 ...

A device attached to a meteorological instrument to provide ventilation; usually a suction fan.

In folklore, a name for rain.

A recording anemometer.

A buoyant balloon kept from rising freely by means of a line secured to a point on the ground, as opposed to a free balloon. See kytoon.

Central Processing Unit. The part of a computer which controls and directs all functions.

A barometer which measures atmospheric pressure using one or a series of aneroid capsules. Also called holosteric barometer.