A type of climatic diagram whose coordinates are some form of temperature vs. a form of humidity or precipitation.

A rain gauge capable of measuring very small amounts of precipitation. Also called micropluviometer, trace recorder.

Binary Coded Decimal. A coding system in which each decimal digit from 0 to 9 is represented by a 4-digit binary number.

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

An instrument resulting from the combination of a thermograph and a hygrograph and furnishing, on the same chart, simultaneous time recording of ambient temperature and humidity.

A plastic molding component formed by the reaction of phenol and formaldehyde. It can be heavily reinforced or "filled" with glass fibers or other materials. Phenolics are known for their high impact strength, excellent wear characteristics, and dimension ...

Electromagnetic radiation of shorter wavelength than visible radiation but longer than x-rays, between 0.02 and 0.4 micron (200 and 4000 angstrom).

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

A special form of the aspiration psychrometer. developed by Assmann, in which the thermometric elements are well shielded from radiation. Psychrometric measurements may be taken with the instrument in the presence of direct solar radiation.

A type of climatic diagram whose coordinates are some form of temperature vs. a form of humidity or precipitation.

A Sunshine recorder of the type in which the time scale is supplied by the motion of the sun. The instrument, which is pointed at the celestial pole, consists of a hemispherical mirror mounted externally on the optical axis of a camera. The lens of the ca ...

A systematic summary of the terms (inflow, outflow, and storage) of the storage equation as applied to the computation of soil-moisture changes, ground-water changes, etc. An evaluation of the hydrologic balance of an area. Also called basin accounting, w ...

A thermodynamic change of state in a system in which there is no transfer of heat or mass across the boundaries of the system. In an adiabatic process, compression always results in warming, expansion in cooling. Compare to diabatic process.

A curve showing the variation of temperature with height in the free air. See lapse rate.

A hygrometer in which the rotation of the hygrometric element is a function of humidity.

A component of a radiosonde consisting of a series of alternate electrically conducting and insulating strips. As these are scanned by a contact the radiosonde transmits temperature and humidity signals alternately. The contact may be a baroswitch as in t ...

A reflecting type telescope with a 45

Wind with a speed between 56 and 63 knots (64 and 72 mph); Beaufort scale number 11.

Any and all forms of water particles, liquid or solid, that fall from the atmosphere and reach the ground.

The record of an aneroid barograph.