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A lens lantern is a small, self-contained lamp structure which may sometimes be used to serve as a lighthouse. Unlike a regular Fresnel lens, the lantern requires no housing to protect it from the weather; its glass sides would refract and magnify the light in the same fashion as would the lens. Lens lanterns were popular alternatives to lighthouses in the nineteenth century; they required less care, were cheaper to erect, and could be fairly easily placed.
The need for beacon lights in the late 19th century led to the development of the "eight-day tubular lens-lantern" in 1885 by Joseph Funck. By using a large, circular oil tank around the top of the lantern, it could operate for up to eight days without additional maintenance. This lantern design, however, was susceptible to being blown out by winds. It was improved upon by David Heap, resulting in the five-day lens lantern in 1889. [1]
A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid, for maritime pilots at sea or on inland waterways.
Longships Lighthouse is an active 19th-century lighthouse about 1.25 mi (2.0 km) off the coast of Land's End in Cornwall, England. It is the second lighthouse to be built on Carn Bras, the highest of the Longships islets which rises 39 feet (12 m) above high water level. In 1988 the lighthouse was automated, and the keepers withdrawn. It is now remotely monitored from the Trinity House Operations & Planning Centre in Harwich, Essex.
The Eddystone Lighthouse is a lighthouse that is located on the Eddystone Rocks, 9 statute miles (14 km) south of Rame Head in Cornwall, England. The rocks are submerged below the surface of the sea and are composed of Precambrian gneiss.
The Bishop Rock is a skerry off the British coast in the northern Atlantic Ocean known for its lighthouse. It is in the westernmost part of the Isles of Scilly, an archipelago 45 kilometres off the southwestern tip of the Cornish peninsula of Great Britain. The Guinness Book of Records lists it as the world's smallest island with a building on it.
Souter Lighthouse is a lighthouse located to the North of Whitburn, Tyne and Wear, England.. Souter Point was the first lighthouse in the world to be actually designed and built specifically to use alternating electric current, the most advanced lighthouse technology of its day. The light was generated by a carbon arc lamp: first lit on 11 January 1871, it was described at the time as 'without doubt one of the most powerful lights in the world'.
North Foreland is a chalk headland on the Kent coast of southeast England, specifically in Broadstairs.
The New Presque Isle Light was built in 1870, at Presque Isle, Michigan, east of Grand Lake, and sits on the namesake peninsula. It is one of 149 lighthouses in Michigan, more than any other state. Because of changing shoreline particularly, or alternatively deterioration of the original building, it is not uncommon for a replacement lighthouse to be placed in the vicinity of an earlier light, in this case, the Old Presque Isle Light.
A Fresnel lantern 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 back light and top light.
Beachy Head Lighthouse is a lighthouse located in the English Channel below the cliffs of Beachy Head in East Sussex. It is 33 m (108 ft) in height and became operational in October 1902. It was the last traditional-style 'rock tower' to be built by Trinity House.
Withernsea Lighthouse is an inland lighthouse that stands in the middle of the town of Withernsea in the East Riding of Yorkshire, England. The lighthouse stands 127 feet (38 m) high and took 18 months to build between 1892 and 1894. Formerly owned and run by Trinity House of London, it ceased operation on 1 July 1976 and is now used as a museum.
Point Sur Lighthouse is a lightstation at Point Sur 24.6 miles (39.6 km) south of Monterey, California at the peak of the 361-foot (110 m) rock at the head of the point. It was established in 1889 and is part of Point Sur State Historic Park. The light house is 40 feet (12 m) tall and 270 feet (82 m) above sea level. As of 2016, and for the foreseeable future the light is still in operation as an essential aid to navigation. Point Sur is the only complete turn-of-the-20th-century lightstation open to the public in California. Three-hour walking tours guided by volunteers are available on Wednesdays and weekends throughout the year.
Start Point lighthouse was built in 1836 to protect shipping off Start Point, Devon, England. Open to the public in summer months, it is owned and operated by Trinity House. It has been designated by English Heritage as a grade II listed building.
Portland Bill Lighthouse is a functioning lighthouse at Portland Bill, on the Isle of Portland, Dorset, England. The lighthouse and its boundary walls are Grade II Listed.
The Kannur Lighthouse is located near the Payyambalam Beach, a few kilometers from Kannur town, in Kerala state, south India. It is adjacent to the Sea View Park and the Government Guest House. The lighthouse is still active and overlooks the Arabian Sea.
Gay Head Light is a historic lighthouse located on Martha's Vineyard westernmost point off of Lighthouse Road in Aquinnah, Massachusetts.
Hurst Point Lighthouse is located at Hurst Point in the English county of Hampshire, and guides vessels through the western approaches to the Solent.
The VRB-25 is a lighthouse optical system designed and built by Vega Industries Ltd. in Porirua, New Zealand. It was originally designed in 1993–95 with the assistance of the United States Coast Guard to meet USCG requirements for a robust mechanism requiring minimum maintenance. It has become the Coast Guard's standard 12 volt rotating beacon. The company's literature says there are more than 400 installations worldwide. More than a quarter of the active lighthouses in Maine have one installed.
St Catherine's Lighthouse is a lighthouse located at St Catherine's Point at the southern tip of the Isle of Wight. It is one of the oldest lighthouse locations in Great Britain.
Casquets Lighthouse is an active lighthouse located on the rocky Les Casquets, Alderney, Channel Islands.
The Lighthouse of Cabo Carvoeiro is an active lighthouse in the civil parish of Peniche, municipality of the same name, in the Portuguese district of Leiria.