| 释义 |
ceiling light ceiling light[′sē·liŋ ‚līt] (engineering) A type of cloud-height indicator which uses a searchlight to project vertically a narrow beam of light onto a cloud base. Also known as ceiling projector. ceiling lightA borrowed light, 1, horizontally located in a ceiling to provide light below.ceiling light A device to determine the height of clouds at night. It consists of a powerful projection lamp (searchlight) and a ceilometer to measure the angle of elevation subtended by the lamp beam. During the day, a ceilometer is used for this purpose. |