searchlight

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searchlight,

device, usually swiveled, using a lens and reflecting surface to direct a powerful beam of light of nearly parallel rays. In 1892 such apparatus was used along the English Channel in coastal defense and later, in the South African War, as an aid to infantry movement. It was also used to illuminate vessels in order to identify them and for possible bombardment, for dazzling the enemy, for illuminating the coast in an attack, and to locate targets, at sea or ashore, for the guns. After 1900 acetylene came into use as an illuminant, and in 1916 Edison invented a portable electric apparatus powered by storage batteries. During World War I powerful searchlights mounted on trucks and railroad cars came into use. The electric arc was generally employed after the American inventor E. A. Sperry introduced (1915) his high-intensity arc lamp based on principles that still predominate in modern searchlight equipment. Searchlights of 1,500 million candle power, visible for 150 mi (241 km), have become common. Revolving searchlights as beacons spaced along air routes have yielded to radio beacons. Similarly, the use of powerful lights coordinated with antiaircraft guns developed during World War II has been outmoded by radar-directed artillery. Small searchlights, which are usually employed for signaling, use incandescent lamps. These lamps are often of the quartz-halogen type in which the filament is run at very high temperatures.

searchlight

[′sərch‚līt]
(optics)
A type of light projector designed to produce a beam of high intensity and minimum divergence; it usually employs a specular paraboloidal reflector to produce parallel rays from a light source located at the focus.

searchlight

1. a device, consisting of a light source and a reflecting surface behind it, that projects a powerful beam of light in a particular direction
2. the beam of light produced by such a device
References in periodicals archive ?
Tender notice number : PROCUREMENT OF VEHICLE MOUNTED SEARCH LIGHT
We will outfit the RTV with search lights, backboards, sirens, radios, infra-red signature systems, GPS systems and other electronic components.
The sirens had sounded and search lights criss-crossed the sky but there was no sound of aircraft.
Quasars act as search lights, piercing the billions of light-years of intergalactic gas that lie between them and Earth.
They pointed out that Lightbourne could have been affected by the hi- tech lighting displays from nearby Blackpool Tower, which include highpowered search lights sweeping the town.
Eight Police vehicles equipped with mobile towers, search lights and cameras would also be available and move with the processions, he added.
Proper lightning arrangements will also be ensured by installing modern search lights on the roads of the campus in evening shift.
PowerVR SGL takes full advantage of PowerVR's features, such as shadows and search lights, and also provides a unified programming environment, allowing the same code to be used for console, PC and arcade development.
When WAPDA Project Authorities at Nauseri site were requested for the help in rescue operation, CGGC was directed to extend all possible support by providing search lights at the site and other technical assistance.
She instructed officers and staff of the company that they should ensure the uninterrupted power supply on the route of Muharram's procession in twin cities and get ready with standby generators and search lights to face any untoward situation on Ashura.
The official further stated that the IGP Sindh called for reviewing the police security master plan covering matters pertaining to police check posts, deployment, communication, red zone areas, CCTV cameras, search lights and fencing etc.