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.

A barometer which measures atmospheric pressure using one or a series of aneroid capsules. Also called holosteric barometer.

Operation mode of a communication circuit in which each end can transmit and receive, but not simultaneously.

Same as contact anemometer.

An instrument for measuring the pressure of gases and vapors. A mercury barometer is a type of manometer.

A measure, proposed by Angstrom, of the precipitation effectiveness of a region.

A chronograph used to make a time-record of certain measured meteorological elements. The most common type, the triple register, records wind direction and speed, duration of sunshine, and amount of rainfall (sensed respectively by a contact anemometer, M ...

In the direction from which the wind is blowing.

Read Only Memory. A memory that cannot be altered in normal use of a computer, Usually used to store information permanently, such as firmware programs.

A unit of energy equal to 1.356joules.

A constant which describes the performance of a wind vane in response to a step change in wind direction. It is calculated from the relative amount of overshoot on two successive swings (half cycles) of a decaying oscillation. This specification is dimens ...

The general term for anemometers operating on the principle that the heat transfer to air from an object at an elevated temperature is a function of the air speed. Examples are the hot-wire anemometer and the katathermometer.

An instrument designed to measure quantities of heat. Sometimes used in meteorology to measure solar radiation.

The humidity transducinu element in a Diamond-Hinman radiosonde. Also called electrolytic strip.

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.

Same as river gauge.

An instrument for taking photographs of an image of the sun in monochromatic light.

The record obtained from a bolometer.

The maximum distance along the runway at which the runway lights are visible to a pilot at touchdown. Runway visual range may be determined by an observer located at the end of the runway, facing in the direction of landing, or by means of a transmissomet ...

Complementary Metal-Oxide Semiconductor. A method of making silicon chips that results in low power consumption by the circuits.