The ceiling projector or cloud searchlight is used to measure the height of the base of clouds (called the ceiling) above the ground.
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.
 See also: Ceiling, Clouds, Light, Cloud, High
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