Ceiling light

CEILING LIGHT
An instrument consisting of a drum and an optical system that projects a narrow vertical beam of light onto a cloud base.

Ceiling Light A type of cloud-height indicator that uses a focused light to project vertically a narrow beam of light onto a cloud base.

ceiling light—An instrument which projects a vertical light beam onto the base of a cloud or into surface-based obscuring phenomena; ...

terms, the area between lines drawn tangential to the extreme limits of fully developed meandersMeasured CeilingA ceiling classification applied when the ceiling value has been determined by an instrument, such as a ceilometer or ceiling light, ...

Ceiling Light: An instrument for measueing cloud heights usually located at the end of an airport runway. 6. Ceilometer: An instrument for measueing cloud heights usually located at the end of an airport runway. 7.

ceiling projector"Same as ceiling light.
ceiling"1. After U.S. weather observing practice, the height ascribed to the lowest layer of clouds or obscuring phenomena when it is reported as broken, overcast, ...

For example, the ceiling projector (also called a ceiling light or cloud searchlight) is used in conjunction with a clinometer or alidade to determine the height of the cloud ceiling at night.

MEASURED CEILING A ceiling classification applied when the ceiling value has been determined by an instrument, such as a ceilometer or ceiling light, or by the known heights of unobscured portions of objects, other than natural landmarks, ...

See also: Cloud, Weather, Ceiling, Atmosphere, Temperature