A radar which is used to obtain the azimuth elevation, and slant range of an airborne target.

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

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.

Same as mirror nephoscope.

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.

A direct-vision nephoscope which is constructed in the following manner: a comb consisting of a crosspiece containing equispaced vertical rods is attached to one end of a column eight to ten feet long and is supported on a mounting that is free to rotate ...

A thermopile used in some types of radiation instruments. See solarimeter.

The depth of water that would result from the melting of snow or ice, assuming measurement on a horizontal surface and no infiltration or evaporation.

General name for an instrument which measures the evaporation rate of water into the atmosphere. See clay atmometer, evaporation pan, evapotranspirometer, Livingston sphere, Piche evaporimeter, radio atmometer.

Any one of numerous devices for the measurement of either speed alone or of both direction and speed (set and drift) in flowing water.

Name applied to a class of instruments which measure the liquid content of the atmosphere.

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 ...

The processing of the form or mode of a signal so as to make it intelligible to, or compatible with, a given device.

A contact anemometer connected to an electrical circuit which is so arranged that the average wind speed is indicated.

Wind with a speed between 11 and 16 knots (13 and 18 mph); Beaufort scale number 4.

A rain gauge capable of measuring very small amounts of precipitation. Also called micropluviometer, trace recorder.

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

The length of air flow past a wind vane required for the vane to respond to 50 percent of a step change in wind direction. Expressed in feet or meters and calculated from delay time times wind tunnel speed.

Area of a computer or other device where various logic and control elements are interconnected. Often a printed circuit board into which other circuit boards plug at right angles.

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