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.
A Fresnel lens 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.
Portland Head Light is a historic lighthouse in Cape Elizabeth, Maine. The light station sits on a head of land at the entrance of the primary shipping channel into Portland Harbor, which is within Casco Bay in the Gulf of Maine. Completed in 1791, it is the oldest lighthouse in Maine. The light station is automated, and the tower, beacon, and foghorn are maintained by the United States Coast Guard, while the former lighthouse keepers' house is a maritime museum within Fort Williams Park.
Carlisle & Finch is a manufacturer of nautical equipment founded in 1893 or 1894 in Cincinnati, Ohio, where, as of 2021, it still has its headquarters. The company's main products through its entire history have been searchlights, mostly for marine applications. It was also known for navigation beacons used by airports and lighthouses.
Chatham Lighthouse, known as Twin Lights prior to 1923, is a lighthouse in Chatham, Massachusetts, near the "elbow" of Cape Cod. The original station, close to the shore, was built in 1808 with two wooden towers, which were both replaced in 1841. In 1877, two new towers, made of cast iron rings, replaced those. One of the towers was moved to the Eastham area, where it became known as Nauset Light in 1923.
The Two Harbors Light is the oldest operating lighthouse in the US state of Minnesota. Overlooking Lake Superior's Agate Bay, the lighthouse is located in Two Harbors, Minnesota. The construction of the lighthouse began in 1891 and was completed the following year, with the light being lit for the first time on April 14, 1892. The first Two Harbors keeper was Charles Lederle and there were normally three keepers assigned to make sure the light was lit every day. The Lighthouse was built to provide safe passage into the Agate Bay Harbor during the early 20th century, as Two Harbors was a major shipping point for the iron ore of the Mesabi Range.
The Michigan Island Lighthouse is a lighthouse operated by the National Park Service and located on Michigan Island on western Lake Superior in the Apostle Islands National Lakeshore.
Stage lighting instruments are used in stage lighting to illuminate theatrical productions, concerts, and other performances taking place in live performance venues. They are also used to light television studios and sound stages.
The Whitefish Point Light is a lighthouse located in Chippewa County in the U.S. state of Michigan. Located on the southeastern shores of Lake Superior, it sits at the edge of Whitefish Point leading to Whitefish Bay. Constructed in 1849, it is the oldest operating lighthouse in the Upper Peninsula. All vessels entering or exiting Lake Superior pass near Whitefish Point. The area is infamously known as the "Graveyard of the Great Lakes" due to the high number of shipwrecks in the area, most famously the SS Edmund Fitzgerald.
Fort Gratiot Light, the first lighthouse in the state of Michigan, was constructed north of Fort Gratiot in 1825 by Lucius Lyon, who later became one of Michigan's first U.S. Senators.
Point Cabrillo Light is a lighthouse in northern California, United States, between Point Arena and Cape Mendocino, just south of the community of Caspar. It has been a federal aid to navigation since 1909. It is part of the California state park system as Point Cabrillo Light Station State Historic Park.
The Highland Light is an active lighthouse on the Cape Cod National Seashore in North Truro, Massachusetts. The current tower was erected in 1857, replacing two earlier towers that had been built in 1797 and 1831. It is the oldest and tallest lighthouse on Cape Cod.
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 they replaced. The lamp used a similar design to an Argand lamp, adding a parabolic reflector behind the lamp and a magnifying lens made from 4-inch-diameter (100 mm) green bottle glass in front of the lamp. A similar variant using a parabolic reflector was created by the inventor of the Argand lamp, Aimé Argand. While the Argand variant became widely used by European lighthouses, the Lewis lamp design was selected by the United States for use in American lighthouses.
Gay Head Light is a historic lighthouse located on Martha's Vineyard westernmost point off of Lighthouse Road in Aquinnah, Massachusetts.
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.
Pigeon Point Light Station or Pigeon Point Lighthouse is a lighthouse built in 1871 to guide ships on the Pacific coast of California. It is the tallest lighthouse on the West Coast of the United States. It is still an active Coast Guard aid to navigation. Pigeon Point Light Station is located on the coastal highway, 5 miles (8 km) south of Pescadero, California, between Santa Cruz and San Francisco. The 115-foot (35 m), white masonry tower, resembles the typical New England structure.
Heligoland Lighthouse is located on Germany's only offshore island, Heligoland. Constructed during World War II as an anti-aircraft tower, it was turned into a lighthouse in 1952. It features the strongest light on the German North Sea coast with a range of 28 nautical miles (52 km) so that it can be seen as far as on the East Frisian or the North Frisian islands and Halligen. The lighthouse is operated by the Tönning water and shipping authority.
An automatic lamp changer is a device used to ensure that a navigational light such as a marine lighthouse or aero beacon stays lit even if a bulb burns out. Numerous types exist. The common design elements are an array of two or more lamps, installed on a mounting which can rotate to various positions. Each position brings a different lamp into the focal point of an optical assembly. Since signal and navigational lights use sophisticated optics to focus the beam, lampchangers are designed to position the new bulb at the focal point with high precision. The device automatically detects when the currently active lamp has ceased to function and moves the next lamp into place.
Berlenga lighthouse, also known as the Duke of Bragança Lighthouse, is a functioning lighthouse situated on the highest point of the granite island of Berlenga Grande, which is a nature reserve in the Atlantic Ocean, 10 kilometres west of the town of Peniche in the Leiria District of Portugal. Although planned for construction in the 18th century, work did not start until 1837 and it was completed in 1842.
Mew Island Lighthouse is an active lighthouse within the Copeland Islands of County Down in Northern Ireland. The current 19th-century tower is the most recent in a series of lighthouses that have been built in the islands, which have helped to guide shipping around the archipelago and into Belfast Lough.
