The element directly responsive to the value of the measured variable.

See bimetallic thermometer.

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

General name for an instrument designed to measure the vertical component of the wind speed. See anemoclinometer.

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

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

in folklore, a name for fire.

Situated on the side from which the wind blows.

The process by which one object becomes adhered to another by the binding action of ice.

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.

A clock-driven instrument mounting which automatically and continuously points in the direction of the sun. It is used with a pyrheliometera,hen continuous direct solar radiation measurements are required.

A numbering system using a base number of 2 and having only two digits: 0 and 1. The fundamental system of representing information with electrical pulses.

Thermometer used for measuring the lowest temperature attained during a given interval of time, for example, a day.

A system of physical units based upon the use of the meter, the metric ton (106 grams), and the second as elementary quantities of length, mass, and time, respectively.

Particle on which the freezing of water occurs.

Same as dew-point hygrometer.

In the direction from which the wind is blowing.

See hydrologic accounting.

Winds from the four cardinal points of the compass; that is, north, east, south, and west winds.

The transmission of data collected at a remote location over communications channels to a central station.