A series of Nansen-bottle water samples and associated temperature observations resulting from one release of a messenger.

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 ...

A pyrheliometer of the bimetallic type used to measure the intensity of direct solar radiation.

An element that can control current without moving parts, heated filaments, or vacuum gaps.

A systematic summary of the terms (inflow, outflow, and storage) of the storage equation as applied to the computation of soil-moisture changes, ground-water changes, etc. An evaluation of the hydrologic balance of an area. Also called basin accounting, w ...

In aviation terminology, route or terminal weather conditions of sufficiently low visibility to require the operation of aircraft under instrument flight rules.

A recording magnetometer.

An increase in the central pressure of a pressure system; opposite of a deepening. More commonly applied to a low rather than a high.

An instrument that shows changes in humidity.

The older name for the Celsius temperature scale. Officially abandoned by international agreement in 1948, but still in common use.

A unit of pressure used principally in oceanography. One decibar (10' dynes/cm2) equals 0.1 bar. In the ocean, hydrostatic pressure in decibars very nearly equals the corresponding depth in meters.

An instrument used for measuring geometric angles. See radio direction-finder.

An old nautical term for mercury barometer.

An accumulation of granular ice tufts on the windward sides of exposed objects that is formed from supercooled fog or cloud and built out directly against the wind.

An aneroid barometer arranged so that the deflection of the aneroid capsule actuates a pen which graphs a record on a rotating drum. Sometimes called aneroidograph.

A common type of terrestrial scintillation; shimmering over a hot surface (such as a roadway) on a quiet, cloudless. summer day.

A mercury-in-glass thermometer which records the temperature upon being inverted and retains its reading until being returned to the first position.

The standard deviation (positive square-root of the variation) of the errors associated with physical measurements of an unknown quantity, or statistical estimates of an unknown parameter or of a random variable.

Programs or instructions which are stored in readonly memory.

A form of psychrometer with wet-bulb and dry-bulb thermometers mounted on opposite sides of a specialty designed graph of the psychrometric tables. It is so arranged that the intersections of two curves determined by the wet-bulb and dry-bulb readings -yi ...