Search results
Results from the WOW.Com Content Network
A Fresnel lens ( / ˈfreɪnɛl, - nəl / FRAY-nel, -nəl; / ˈfrɛnɛl, - əl / FREN-el, -əl; or / freɪˈnɛl / fray-NEL[ 1]) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.
A Fresnel with the lens open to show the ridges. There is no lamp in the instrument. A Fresnel lantern (pronounced frəˈnɛl or fruh-nel) is a common lantern used in theatre that employs a Fresnel lens to wash light over an area of the stage. The lens produces a wider, soft-edged beam than a spotlight or key light, and is commonly used for ...
A Fresnel lantern (UK), or simply Fresnel (US), employs a Fresnel lens to wash light over an area of the stage. The lens is named after French physicist Augustin-Jean Fresnel, and consequently pronounced with a silent "s". The distinctive lens has a 'stepped' appearance instead of the 'full' or 'smooth' appearance of those used in other lanterns.
The Yaquina Head Light, also known early in its existence as the Cape Foulweather Lighthouse (though Cape Foul Weather is 4 miles to the north) is a lighthouse on the Oregon Coast of the United States, established in 1873. It is located in Lincoln County, near Newport at Yaquina Head. The tower stands 93 feet (28 m) tall, and is the tallest ...
The present lighthouse is built in stone and brick and has three large 1 order Fresnel lenses in a lens house that rotates four times per minute, hence giving twelve flashes per minute. Based on Augustin-Jean Fresnel 's design, the lens house was constructed by the French company Barbier & Barnard and delivered in the summer of 1900.
Hyperradiant Fresnel lens. Hyper-radial or hyperradiant Fresnel lenses are Fresnel lenses used in lighthouses. They are larger than "first-order" lenses, having a focal length (radius) of 1330 mm (52.36 inches). The idea was mentioned by Thomas Stevenson in 1869 [1] and first proposed by John Richardson Wigham in 1872, and again proposed by ...
The 16.5-foot (5.0 m) tall original 1st-order Fresnel lens of the Cape Canaveral lighthouse (left) on display at the Ponce de Leon Inlet Lighthouse Museum with the 1st-order Fresnel lens of the Ponce de Leon Inlet Light (right). Ownership of the lighthouse was transferred by the Coast Guard to the United States Air Force on December 14, 2000 ...
Klieg light. A Klieg light is an intense carbon arc lamp especially used in filmmaking. It is named after inventor John Kliegl and his brother Anton Kliegl. Klieg lights usually have a Fresnel lens with a spherical reflector or an ellipsoidal reflector with a lens train containing two plano-convex lenses or a single step lens.