Same as mirror nephoscope.

An early and once universal name for the mercury barometer.

Name sometimes used in place of pyranometer as a generic term.

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

A self-recording thermometer.

Wind with a speed between 41 and 47 knots (47 and 54 mph); Beaufort scale number 9.

The maximum deviation of any points from a straight line drawn as a "best fit" through the calibration points of an instrument with a linear response curve. Usually expressed as a percentage of full- scale range.

The writing component of a recording instrument.

A general term for atmospheric water in any of its forms, i.e. clouds, fog, hail, ice crystals, rain.

Same as freezing point.

A record obtained from a meteorograph. A chart in which meteorological variables are plotted against time.

In physics, any process in which the flux density (or power, amplitude, intensity, illuminance, etc.) of a "parallel beam" of energy decreases with increasing distance from the source. Attenuation is always due to the action of the transmitting medium its ...

An instrument used to measure the water vapor content of the air.

The record obtained from a bolometer.

An apparatus, used in studying soil temperatures, for measuring the total supply of heat during a given period.

The lowest level at which the wind becomes geostrophic in the theory of the Ekman spiral. Also called gradient wind level.

A device for measuring sea-surface waves. It consists of a weighted pole below which a disk is suspended at a depth sufficiently deep for the wave motion associated with deepwater waves to be negligible. The pole will then remain nearly as if anchored to ...

A reflecting type telescope with a 45

A rainbow formed by light rays which have been reflected from an extended water surface. Not to be confused with a reflected rainbow whose image may be seen in a still body of water. The center of a reflection rainbow is at the same elevation as the sun b ...

A magnetometer of the electromagnetic type which is used to measure the horizontal intensity of the earth's magnetic field.