A common type of liquid-inglass thermometer, used, in meteorology, in psychrometers and as a maximum thermometer.

A wind blowing in a direction perpendicular to the course of a moving object.

A conically shaped, copper rain gauge shield.

An instrument for determining the direction of cloud motion. There are two basic designs of nephoscope, the directvision nephoscope and the mirror nephoscope.

In folklore, a name for wind.

A temperature telemeter.

The wind speed and direction at various levels in the atmosphere above the level reached by surface weather observations.

The lowest temperature that can be obtained on a wet-bulb thermometer in any given sample of air. Obtained by evaporation of water (or ice) from the muslin wick. Used in computing dew point and relative humidity.

Solar radiation scattered by particles in the atmosphere.

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

The level at which ice crystals and snowflakes melt as they descend through the atmosphere.

That horizontal wind velocity at which the Coriolis acceleration exactly balances the horizontal pressure force. It is directed along contour lines or isobars.

A cup anemometer with its shaft mechanically coupled to a magneto.

An instrument for measuring differences of electric potential.

The temperature at which a solid substance undergoes fusion, i.e. melts, changes from solid to liquid form. All substances have their characteristic melting points. For very pure substances the temperature range over which the process of fusion occurs is ...

The correctable part of the inaccuracy of an instrument.

An instrument for measuring temperature by utilizing the variation of the physical properties of substances according to their thermal states. Thermometers may be classified into types according to their construction; deformation thermometer, electrical t ...

A series of Nansen-bottle water samples and associated temperature observations resulting from one release of a messenger.

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

The stage on a fixed river gauge at which it is necessary to begin issuing warnings or river forecasts if adequate precautionary measures are to be taken before flood stage is reached.