The record or trace made by a microbarograph.

The distance or length of flow of the air past a point during a given interval of time.

A protective coating applied to circuits.

An instrument which measures evaporation by measuring the loss of water from a burette reservoir through a ceramic disc.

The energy of any type of electromagnetic radiation. Also called radiation.

A mercury barometer in which the tube is U-shaped and the upper and lower mercury surfaces have the same diameter.

A photometric unit of illuminance or illumination equal to one lumen per square meter

In general, solar radiation received at the earth's surface. Contracted from incoming solar radiation.

A white disk 12" or more in diameter which is lowered into the sea to estimate transparency of the water. The depths are noted at which it first disappears when lowered and reappears when raised.

The amount of precipitation captured by a rain gauge.

film hygrometer element-An electrical hygrometer element constructed of a plastic strip coated with a film of carbon black dispersed in a hygroscopic binder. Variations in atmospheric moisture content vary the volume of the binder and thus change the resi ...

A hydrometeor consisting of a visible aggregate of minute water droplets suspended in the atmosphere near the earth's surface. Fog differs from cloud only in that the base of fog is at the earth's surface while clouds are above the surface.

The total area drained by a river and its tributaries. Same as watershed.

Radio Direction Finder.

Apparatus using the combined simultaneous action of a bimetallic thermometer and a hair hygrometer to move a needle in front of a divided scale. fts construction permits dew point variations to be indicated approximately.

A navigational aid used to facilitate the landing of an aircraft at an airport in instrument weather, i.e. low visibility.

A unit of luminance or brightness equal to 1/d candles per foot'.

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 ...

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

See hurricane beacon.