Ceiling projector
id:
ceiling-projector-281-5991078
title:
Ceiling projector
text:
The ceiling projector or cloud searchlight is used to measure the height of the base of clouds above the ground. It is used in conjunction with an alidade, usually positioned 1000 ft (300 m) away and wherever possible set at the same level. The projector is normally set at 90°, although 71° 31' may be used, in relation to the terrain. The projector consists of a 430-watt incandescent bulb set in a weatherproof housing. Inside the housing are two mirrors; the first, above the bulb, reflects the l
brand slug:
wiki
category slug:
encyclopedia
description:
Meteorological tool
original url:
https://en.wikipedia.org/wiki/Ceiling_projector
date created:
date modified:
2024-04-21T08:07:33Z
main entity:
{"identifier":"Q3407147","url":"https://www.wikidata.org/entity/Q3407147"}
image:
{"content_url":"https://upload.wikimedia.org/wikipedia/commons/6/60/Ceiling_projector_extexterior.JPG","width":1232,"height":1632}
fields total:
13
integrity:
15