The Collaborative International Dictionary of English. 2000.
Fresnel lens — Fres nel lens [See {Fresnel lamp}.] (Optics) See under {Lens}. [1913 Webster] … The Collaborative International Dictionary of English
Fresnel lantern — plano convex lens of equivalent powerA Fresnel lantern (or merely Fresnel) is a spotlight used in theatre, which employs a Fresnel lens to wash light over an area of the stage. The lens produces a wider, soft edged beam of light, which is… … Wikipedia
Fresnel lens — A Fresnel lens (pronounced [ frɛz.nəl] or [freɪ nɛl] ) is a type of lens invented by French physicist Augustin Jean Fresnel. Originally developed for lighthouses, the design enables the construction of lenses of large aperture and short focal… … Wikipedia
Lewis lamp — The Lewis lamp is a type of light fixture used in lighthouses. It was invented by Winslow Lewis who patented the design in 1810. The primary marketing point of the Lewis lamp was that it used less than half the oil of the prior oil lamps which… … Wikipedia
Hyperradiant Fresnel lens — Hyperradiant fresnel lenses are fresnel lenses larger than first order lenses, so they are larger than 12 feet (3.7 m) tall and 6 feet (1.8 m) across, with a focal length larger than 36 inches (0.91 m). The Hyperradiant fresnel lenses were the… … Wikipedia
Fres'nel' lan'tern — Fresnel lamp Fres nel lamp , Fres nel lan tern Fres nel lan tern[From Fresnel the inventor, a French physicist.] A lantern having a lamp surrounded by a hollow cylindrical Fresnel lens. [1913 Webster] … The Collaborative International Dictionary of English
Minnesota Point — / Park Point from the Duluth, Minnesota hillside looking south toward Wisconsin Minnesota Point, also known as the Park Point neighborhood of Duluth, Minnesota, United States;[1] is … Wikipedia
Lighthouse — For other uses, see Lighthouse (disambiguation). Speculative drawing (c. 2006) of the Lighthouse of Alexandria, on the island of Pharos … Wikipedia
Stage lighting instrument — Stage lighting instruments are used in stage lighting to illuminate theatrical productions, rock concerts and other performances taking place in live performance venues. They are also used to light television studios and sound stages.Terminology… … Wikipedia
lighthouse — /luyt hows /, n., pl. lighthouses / how ziz/. 1. a tower or other structure displaying or flashing a very bright light for the guidance of ships in avoiding dangerous areas, in following certain routes, etc. 2. either of two cylindrical metal… … Universalium
