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

Any soft, gentle breeze.

Of or pertaining to the air, atmosphere, or aviation. Also, same as antenna.

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 ...

An instrument whose calibration can be determined by means of simple physical measurements on the instrument. Compare to secondary instrument.

Upwarddirected solar radiation, reflected by the earth's surface and the atmosphere.

Wind with a speed between 4 and 27 knots (4 and 31 mph); Beaufort scale numbers 2 through 6.

check chamber-A chamber use to check the sensing elements of radiosonde equipment.

Wind with a speed between 22 and 27 knots (25 and 31 mph); Beaufort scale number 6.

The decrease of an atmospheric variable with height, the variable being temperature, unless otherwise specified.

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 common unit used in measurement of atmospheric pressure. Defined as that pressure exerted by a one-inch column of mercury at standard gravity and a temperature of 0'C.

The greatest distance at which it is just possible to see and recognize with the unaided eye (1) in the daytime, a prominent dark object against the sky at the horizon, and (2) at night, a known, preferably unfocused, moderately intense light source.

An instrument for determining the degree of polarization of light. See photopolarimeter.

Transistor-Transistor Logic.

Electromagnetic radiation of very short wavelength. lying within the wavelength interval of 0.1 to 1.5 angstroms (between gamma rays and ultraviolet radiation). X-rays penetrate various thicknesses of all solids, and they act on photographic plates in the ...

A device used to switch electrical current at a selectable setpoint temperature.

A sounding balloon which, when operationally inflated, resembles an inverted teardrop.

A line of equal or constant pressure.

Thermometer used for measuring the lowest temperature attained during a given interval of time, for example, a day.