Rain gauge which registers precipitation that is too light to be registered by ordinary recording of the depth of water from precipitation. Same as ombrometer.

The process by which water in plants is transferred as water vapor to the atmosphere. Also, the amount of water so transferred.

A clay atmometer consisting of a hollow ceramic sphere through which evaporation occurs. Evaporation is measured by the loss of water from the reservoir which feeds the sphere.

The outer, solid portion of the earth: the crust of the earth.

A hygrometer based upon the diffusion of water vapor through a porous membrane.

Same as atmometer.

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

Wind with a speed between 17 and 21 knots (19 and 24 mph); Beaufort scale number 5.

A set of weekly colored rainbow arcs sometimes discernable inside a primary rainbow.

A c.g.s. (centimeter-gram-second) unit of mass. Originally defined as the mass of 1 cubic centimeter of water at 4

Abbreviation for radio frequency.

The transducer of any hygrometer, i.e. that part of a hygrometer that quantitatively "senses" atmospheric water vapor.

Precipitation of white, opaque, spherical or conical ice particles that are crisp and easily crushed and that have diameters of 2 to 5 mm.

The value of the quantity measured, as indicated or otherwise provided by a measuring instrument.

The quantity to be measured (or modulated, or detected, or operated upon) which is received by an instrument. Thus, for a thermometer. temperature is the input quantity.

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

A class of rain gauge in which the level of the collected rain water is measured by the position of a float resting on the surface of the water.

A type of wind vane having a split or V-shaped tail. The apex orients itself to the direction of the wind.

A rocket designed primarily for routine upper air observations in the lower 250,000 feet of the atmosphere, especially that portion inaccessible to balloons (above 100,000 feet).

Instrument for measuring the mean intensity of glo global solar radiation (direct and diffuse) near the earth's surface in a specified time interval.