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

The array of indicating marks and figure in relation to which the position of an index is observed, i.e. a scale plate on a recorder.

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.

See captive balloon, ceiling balloon, constant-level balloon, free balloon, hurricane beacon, kytoon, Moby Dick balloon, pilot balloon, radiosonde balloon, rockoon, skyhook balloon, transosonde.

The total amount of water transferred to the atmosphere by evapotranspiration.

A recording hair hygrometer.

A unit of pressure which directly expresses the force exerted by the atmosphere. Equal to 1000 dynes/cm2 or 100 pascals.

A high-altitude sounding system consisting of a small solid- propellant research rocket carried aloft by a large plastic balloon. The rocket is fired near the maximum altitude of the balloon flight.

A device for computing certain psychrometric data, usually the dew point and the relative humidity, from known values of the dry-bulb and wet-bulb temperatures and the atmospheric pressure. One type is the circular slide-rule form and, like the psychromet ...

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

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

An instrument that automatically records pressure and temperature.

A pressure tube anemometer, consisting of a pitot tube mounted on the windward end of a wind vane and a suitable manometer to measure the developed pressure and calibrated in units of wind.

The total luminous flux received on a unit area of a given real or imaginary surface, expressed in such units as the foot-candle, lux, or phot.

An instrument for studying, or examining substances in, polarized light. See Savant polariscope.

Abbreviation for radio frequency.

A mercury barometer of the fixed cistern type in which a moveable scale terminating in an ivory point is used to compensate for the variations in the height of the mercury in the cistern

Negative Vorticity Advection.

force wind-Wind with a speed above 64 knots (73 mph); Beaufort scale numbers 12 through 17.

A thermograph in which ventilation is provided by a suction fan.