The record of a barograph.

An instrument for measuring differences of electric potential.

A instrument designed to study small fluctuations of some quantity. The microbarograph is an example of a recording pressure variometer.

A measure of the degree to which the weather or climate of a region is favorable to the process of evaporation. Usually considered to be the rate of evaporation. under existing atmospheric conditions, from a surface of water which is chemically pure and h ...

The pressure unit of the meter-ton-second system of physical units. equal to 10 millibars or 101 dynes per cm2.

Technically, the temperature registered by the dry-bulb thermometer of a psychrometer. However, it is identical with the temperature of the air and may also be used in that sense.

A system of estimating and reporting wind speed, originally based on the effect of various wind speeds on the amount of canvas that a full-rigged nineteenth century frigate could carry.

An instrument which measures the effective terrestrial radiation. See Angstrom pyrgeometer.

In general, pertaining to or affording an overall view. In meteorology, this term has become somewhat specialized in referring to the use of meteorological data obtained simultaneously over a wide area for the purpose of obtaining a comprehensive and near ...

Any one of a family of circular arcs consisting of concentric colored bands, arranged from red on the inside to blue on the outside, which may be seen on a "sheet" of water drops (rain, fog, spray). The most common of the many possible is the primary rain ...

A unit that represents one degree of deviation from a reference point in the mean daily outdoor temperature (usually 65

An apparatus, used in studying soil temperatures, for measuring the total supply of heat during a given period.

A unit of pressure equal to 10' dyne per cm-' (101 barye), 1000 millibars. 29.53 inches of mercury.

See calorie.

An instrument used for the determination of the electrical conductivity of the atmosphere.

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 ...

Radiation with wavelengths greater than 4 microns. (In meteorology, same as infrared radiation.)

A graduated scale placed in a position so that the stage of a stream may be read directly from it. Staff gauges may be placed on bridge piers or pilings, etc., or placed on specially constructed supports.

The effect upon the measurement of rainfall caused by the presence of the rain gauge.

The lowest value of a measured quality at which a sensor meets its accuracy specification.