An instrument used to measure changes in the level of the water in an evaporation pan. The gauge is normally placed in a Stillwell and adjusted so that the point of the hook just breaks the water surface. The change in water level is read on the attached ...

A fabric cone attached to a metal ring and used to indicate wind direction. often at airfields.

Same as atmometer.

The mean difference between the readings of a given instrument and those of a standard instrument.

A numbering system using a base number of 16 and including the ten decimal digits (0 to 9) along with six alpha digits (A to F). Thus. a digit is available to represent each of the possible values of a 4-bit binary digit.

An instrument which indicates the presence of dust particles in the atmosphere. Also spelled coniscope.

A river gauge in which a weight suspended on a wire is lowered to the water surface from a bridge or other overhead structure to measure the distance from a point of known elevation to the water surface.

The measuring, transmitting, receiving, and indicating apparatus for obtaining the value of a quantity at a distance.

A large plastic constant-level balloon for duration flying (in excess of 24 hours) at altitudes above 40,000 feet, used for the determination of wind fields and the measurement of upper atmospheric parameters.

Temperature of equilibrium between the liquid and vapor phases of a substance at a given pressure.

An Instrument used to determine dew point.

Routine broadcast of meteorological information for aircraft in flight.

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

Similar to the spectroheliograph, but used for visual instead of photographic purposes.

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

A small, limited-capacity central processing unit contained entirely on one semiconductor chip.

The point (physical and/or electrical) where two distinct data processing elements meet.

A colorless and odorless gaseous element. The lightest and apparently the most abundant chemical element in the universe. However, it is found only in trace quantities in the observable portion of our atmosphere, only about 0.00005 percent by volume of dr ...

A type of cloud height indicator which uses a searchlight to project vertically a narrow beam of light onto the cloud base. The height of the cloud is determined using a clinometer, located at a known distance from the ceiling light, to measure the angle ...

A large plastic constant-level balloon for duration flying at very high altitudes.