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A lighthouse is a tower, building, or framework designed to emit light from a system of lamps and lenses or, in older times, from a fire and used as an aid to navigation and to pilots at sea.

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Wikipedia about lighthouse

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A lighthouse is a tower, building, or framework designed to emit light from a system of lamps and lenses or, in older times, from a fire and used as an aid to navigation and to pilots at sea.

Lighthouses are used to mark dangerous coastlines, hazardous shoals and reefs, safe entries to harbors and can also assist in aerial navigation. Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and replacement by modern electronic navigational aids.

Lighthouse technology

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Lens technology

Prior to modern strobe lights, lenses were used to concentrate the light from a continuous source. Two tasks were involved:

  • vertical light rays of the lamp are redirected into a horizontal plane
  • horizontally the light is focused into one or a few directions at a time, with the light beam sweeping around; as a result, in addition to seeing the side of light beam, there are instants that one can see the light directly from a further distance away.
Fresnel lens: This concentration of light is accomplished with a rotating lens assembly. In classical period lighthouses, the light source was a kerosene lamp, and the lenses were rotated by a weight driven clockwork assembly wound by lighthouse keepers, sometimes as often as every two hours. The lens assembly usually floated in mercury to reduce friction. In more modern lighthouses, electric lights and motor drives were used, generally powered by diesel electric generators. These also supplied electricity for the lighthouse keepers.Crompton & Rhein (2002)

Efficiently concentrating the light from an omnidirectional light source requires a lens of very large diameter. This would require a very thick and heavy lens if naively implemented. The development of the Fresnel lens (pronounced 1/FREH nel or 2/frez null) in 1822 revolutionized lighthouses in the 1800s, focusing 85% of a lamps light versus the 20% focused with the parabolic reflectors of the time. Its design enabled the construction of lenses of large size and short focal length without the weight and volume of material in a lens of conventional design. Although the Fresnel lens was invented in 1822, it wasn't used in the US until the 1850s due to the parsimonious administrator of the United States Lighthouse Establishment, Stephen Pleasonton. With the creation of the United States Lighthouse Board in 1852, all U. S. lighthouses received Fresnel lenses by 1860.

Fresnel lens order of magnitude: Fresnel lenses were ranked by Order, with a first order lens being the largest, most powerful and expensive; and a sixth order lens being the smallest. The order is based on the focal length of the lens. A first order lens has the longest focal length, with the sixth being the shortest. Coastal lighthouses generally use first, second or third order lenses, while harbor lights and beacons use fourth, fifth or sixth order lenses.

Search results for Lighthouse

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St. Augustine Lighthouse and Museum

Offers tours of the St. Augustine Lighthouse and a maritime history exhibit.www.staugustinelighthouse.com/

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The world's largest website about lighthouses, including a magazine, store, and lighthouse information on searchable databaseswww.lighthousedepot.com/

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News about Lighthouse

Lighthouse Marks 25-Year Anniversary

The Pasco Tribune"Can't" perhaps becomes the biggest hurdle for blind people. For a quarter century, Lighthouse for the Visually Impaired and Blind has been the beacon for some 20,000 people to find a path out of darkness.http://www2.tbo.com/content/2008/sep/03/pa-lighthouse-marks-...

Swimming banned at risky Chatham beach

Cape Cod Times CHATHAM — Town officials have closed Lighthouse Beach to swimming after a 46-year-old Groton man drowned Sunday in dangerous currents while trying to rescue his 10-year-old daughter. http://www.capecodonline.com/apps/pbcs.dll/article?AID=/2008...

U.K. town designs attractive power station

UPILONDON, Sept. 4 (UPI) -- Officials in the British city of Derby want to design a lighthouse theme at their proposed hydroelectric power station.http://www.upi.com/Energy_Resources/2008/09/04/UK_town_desig...

Hampton Lighthouse beckons visitors

The Annapolis County SpectatorBy Heather Killen Spectator NovaNewsNow,com The Hampton Lighthouse is now beckoning visitors to visit the past. This is the first summer the landmark has been open to the public...http://novanewsnow.com/article-245125-Hampton-Lighthouse-bec...

Arkansas Lighthouse for the Blind to Expand Facility

Arkansas BusinessThe Arkansas Lighthouse for the Blind in southwest Little Rock is expected to announce a 20,000-SF expansion Thursday morning.http://www.arkansasbusiness.com/article.aspx?aid=107846.5492...

News about Lighthouse

KILAUEA LIGHTHOUSE

Deccan HeraldKilauea Lighthouse on the island of Kauai is the northernmost point of the main Hawaiian Islands. Built in 1913, it had the largest lens of its kind and guided ships heading to and from the Orient. Photo by Abhinav R. Mohan, Fairfax, VAhttp://www.deccanherald.com/deccanherald.com/content/General...

Launch of Business Development North West Survey 2009 - Focus on ...

PR.comLighthouse Business Consulting announces the launch of the Business Development North West 2009 Survey. The survey focuses on law firms - and on the critical area of sales skills. Wilmslow, Cheshire, United Kingdom, September 17, 2008 --( PR.com ... http://www.pr.com/press-release/105817

Lighthouse sends seven-member grew to disaster area

Plainview Daily HeraldFLOYDADA — Seven employees of Lighthouse Electric Cooperative are East Texas-bound to help rebuild power lines downed in the wake of Hurricane Ike. Ike, a Category 2 hurricane, hit Galveston/Houston late Friday and early Saturday before continuing ... http://www.myplainview.com/articles/2008/09/16/breaking_news...

Everything but the sea breeze

Twin Falls Times-NewsA Paul couple with affection for the ocean has transformed their front yard into faux seashore. Earlier this month Pam and John Keller built a 16-foot lighthouse. While it may never steer watercraft to safe harbor at the Burley Marina, the iconic ... http://www.magicvalley.com/articles/2008/09/17/news/minicass...

Underwater Museum in Egypt to showcase remnants of Cleopatra's palace

Newstrack IndiaThe proposed museum could include pieces believed to be from the Pharos of Alexandria lighthouse, one of the seven ancient wonders of the world.http://www.newstrackindia.com/newsdetails/17320

Search results for Lighthouse

Lighthouse

WELCOME TO LIGHTHOUSE Lighthouse provides creative and professional development opportunities for filmmakers ... http://www.lighthouse.org.uk/

Lighthouse Roasters Fine Coffee: Wholesale/Retail Coffee

Lighthouse Roasters Fine Coffees: Wholesale/Retail. We have been roasting some of Seattle's Best Coffee since 1995. 400 North 43rd Street-Cafe:206.634.3140-Wholesale:206.633.4444http://www.lighthouseroasters.com/

Lighthouse Friends

Lighthouse pictures, directions, GPS coordinates, and history for U.S. lighthouses ... Included on this site are photographs, directions, historical accounts,http://www.lighthousefriends.com/

Lighthouse

Compelling design and communication, strategic thinking, underpinned by technology. ... Contact Information Lighthouse The Old Grammar School Househttp://www.lighthouseuk.net/

Lighthouse

Located on beautiful Tybee Island, this Lighthouse, has the original associated buildings and a first order Fresnel Lens. The Lighthouse is open to the publichttp://www.tybeelighthouse.org/
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Answers for Lighthouse

Cases and Notes  ? ?

What is the third book in the Lighthouse Trilogy?

Cases and Notes ? ?I'm psychic?
running wild

What is the name of the lighthouse built offshore on the east coast of Scotland at the start of the 1800`s?

running wildBell Rock ?
Randy

What would be the consequences of trespassing on a US Coast Guard lighthouse?

RandyFederal prison because lighthouses are Federal property.
Angel

is there any lighthouse in long beach or close to long beach, California except parkers lighthouse?

AngelYou would have to go the the LA Harbor one. You would go to Point Fermin Park in San Pedro and walk 1 1/2 miles on the breakwater over all the dead cats + all the amazing amount of bird feces to get t...
stevel226

Lighthouse tours or open to the public in New York City area?

stevel226Twin Lights in NJ and Sandy Hook in NJ have regular tours and are open to climb both are free. "the little red lighthouse" under the GWB can be viited anytime and climed on speciel occasion. Coney Isl...

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