An instrument which automatically records the measurement of two or more meteorological elements.

Transistor-Transistor Logic.

Sustained winds greater than or equal to 40 mph or gust greater than or equal to 58 mph.

An aneroid barometer arranged so that the deflection of the aneroid capsule actuates a pen which graphs a record on a rotating drum. Sometimes called aneroidograph.

Cathode Ray Tube. A display element, consisting of a vacuum tube and screen, used with computers.

The condition of the atmosphere when the amount of water vapor present is the maximum possible at the existing temperature.

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

The inaccuracy that the manufacturer permits when the unit is calibrated in the factory.

An instrument for measuring radiant energy. It consists of an ether differential thermometer with blackened bulbs. One of the bulbs is exposed to the unknown radiation and the other to a black body source whose temperature can be varied. Equality of radia ...

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

A graphical representation of a frequency distribution. The range of the variable is divided into class intervals for which the frequency of occurrence is represented by a rectangular column. The height of the column is proportional to the frequency of ob ...

A fixed support for mounting maximum and minimum thermometers of the liquid-in-glass type. The support holds the thermometers at the correct operating attitude and also permits their rotation for resetting when desired.

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.

A sunshine recorder of the type in which the time scale is supplied by the motion of the sun. It consists essentially of a spherical lens which bums an image of the sun upon a specialty prepared card.

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 ...

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

An instrument for measuring the extinction coefficient in water.

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

A type of directional antenna used on some types of radar and radio equipment consisting of an array of elemental, single- wire dipole antennas and reflectors.

An up slope wind due to local surface heating. Opposite of katabatic wind.