drum lens

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• Drum Point Light — 1915 photograph of Drum Point Light (USCG) Location originally off Drum Point at the mouth of the Patuxent River in the Chesapeake Bay; relocated to the Calvert Marine Museum Coordinates …   Wikipedia

• Optokinetic drum — An optokinetic drum is a rotating instrument to test vision in which individuals are seated facing the wall of the drum. The interior surface of the drum is normally striped; thus, as the drum rotates, the subject s eyes are subject to a moving… …   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

• Lime Kiln Light — Infobox Lighthouse caption = location = San Juan Island, Washington coordinates = yearlit = 1919 automated = 1962 yeardeactivated = foundation = Surface construction = concrete shape = Octagonal height = 38 ft lens = Fourth order Fresnel lens… …   Wikipedia

• printing — /prin ting/, n. 1. the art, process, or business of producing books, newspapers, etc., by impression from movable types, plates, etc. 2. the act of a person or thing that prints. 3. words, symbols, etc., in printed form. 4. printed material. 5.… …   Universalium

• motion-picture technology — Introduction       the means for the production and showing of motion pictures. It includes not only the motion picture camera and projector but also such technologies as those involved in recording sound, in editing both picture and sound, in… …   Universalium

• eye, human — ▪ anatomy Introduction  specialized sense organ capable of receiving visual images, which are then carried to the brain. Anatomy of the visual apparatus Structures auxiliary to the eye The orbit       The eye is protected from mechanical injury… …   Universalium

• Corfield Periflex — 1953 The Periflex 35mm rangefinder camera was launched by K. G. Corfield Ltd, England in May 1953 as the first and original model from this source. The camera resembles the Leica Standard and qualifies fully as a Leica copy. However, film loading …   Wikipedia

• performing arts — arts or skills that require public performance, as acting, singing, or dancing. [1945 50] * * * ▪ 2009 Introduction Music Classical.       The last vestiges of the Cold War seemed to thaw for a moment on Feb. 26, 2008, when the unfamiliar strains …   Universalium

• Digital camera back — Kodak DCS420 digital camera, consisting of a modified Nikon N90s body (left) and a digital back (right) shown here separated …   Wikipedia

• American Shoal Light — Infobox Lighthouse caption = American Shoal lighthouse location = east of the Saddlebunch Keys, close to Looe Key coordinates = coord|24|31|30|N|81|31|12|W|type:landmark yearlit = 1880 automated = 1963 yeardeactivated = foundation = screw pile… …   Wikipedia