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 ?
ACR Electronics and The Yacht Group have announced a joint venture to develop and market Yacht Beams, the most powerful and durable searchlights on the market.
Summary: CAIRO - The market of electric appliances in central Cairo has been booming as demand for electric generators and searchlights shot up due to power cuts.
Peak Beam Systems' line of Maxa Beam Searchlights offer an unparalleled 12,000,000 CandlePower output and 3,500 meter range in military-grade housings.
Armed only with powerful searchlights to pick out enemy planes for the anti-aircraft guns, they were obvious targets to attack.
The sides and back are 1-in high to keep the unattached searchlights from falling off.
Xousia Systems Group has added two new searchlights to its line of innovative lighting products.
On the other hand, when the commanding officer of the 30th Searchlight Regiment was asked to put forward recommendations for awards for his men after the defeat of the Axis forces in North Africa in 1943, he did not wish to do so because he felt that in searchlights so much depended on teamwork and it was difficult to pick out individuals who merited an award more than others.
Standing in for the arthropod abdomen will be an array of the world's most powerful robotic searchlights, perched one apiece atop custom-built steel towers ringing the site of the new Yamaguchi Center, which was designed by Arata Isozaki.
Strobe and searchlights will be used to signal aircraft pilots not to fly over the Hollywood Bowl or Ford Amphitheater during concerts this summer, an official said Friday.
One shows a pair of cone-shaped searchlights streaming out from the center in opposite directions, each leaving a glowing trail of ionized gas.
In addition, we are the market leader for solar simulators and high-intensity searchlights, such as our Nightsun(R) that is used by law enforcement and military agencies.
Peak Beam's line of Maxa Beam Searchlights have been fielded by U.