A type of cooling-power anemometer based upon the principle that the time constant of a thermometer is a function of its ventilation.

Same as ombrometer.

A halo consisting of a faint white circle passing through the Sun and running parallel to the horizon for as much as 360

The study of waters (including oceans, lakes, and rivers) embracing either: (a) their physical characteristics, from the standpoint of the oceanographer or limnologist; or (b) the elements affecting safe navigation, from the point of view of the mariner. ...

A remote indicator for wind speed and direction used in conjunction with a contact anemometer and a wind vane. The indicator consists of a center light, connected to the contact anemometer, surrounded by eight equally spaced lights which are individually ...

A description or explanation of the manner in which the height of the ceiling is determined, i.e. aircraft ceiling, balloon ceiling. estimated ceiling, indefinite ceiling, measured ceiling, precipitation ceiling.

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 ...

As used by the U.S. Army Corps of Engineers, the departure (in

One of the radiation laws which states that the wavelength of maximum radiation intensity for a black body is inversely proportional to the absolute temperature of the radiating black body.

A device used by oceanographers to obtain subsurface samples of sea water. The "bottle" is lowered by wire, its valves open at both ends. It is then closed in situ by allowing a weight (called a messenger) to slide down the wire and strike the reversing m ...

A radar term for a single pulse of radio energy.

A general term to designate apparatus designed to observe the details of weather during thunderstorms.

A protective coating applied to circuits.

The unit of force in the centimeter-gram-second system of physical units, i.e. one gm cm per sec2, equal to 7.233 x 10-5 poundal.

A polarimeter utilizing a Wollaston prism as a polarizer and a Nicol prism as an analyzer.

Instrument for measuring the depth of water from precipitation that is assumed to be distributed over a horizontal, impervious surface and not subject to evaporation.

The play or loose motion in an instrument due to the clearance existing between mechanically contacting parts.

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

See calorie.

An instrument, dropped from high attitude and carried by a stable parachute. used to measure the vertical component of turbulence aloft.