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Grand Marais Light
Grand Marais Light is located on the outer end of a breakwater on the shore of Lake Superior in the city of Grand Marais in Cook County, Minnesota, United States. It is located in USCG District 9. The tower was first lit in 1922 and is still operational. The original keeper's house on shore is now operated as the main museum of the Cook County Historical Society. The museum features exhibits on area history, industry and culture. See also * Grand Marais, Minnesota * List of lighthouses in the United States References External links Cook County Historical Society Buildings and structures in Cook County, Minnesota Lighthouses completed in 1922 Lighthouses in Minnesota Museums in Cook County, Minnesota Transportation in Cook County, Minnesota Grand Marais, Minnesota {{US-lighthouse-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grand Marais, Minnesota
Grand Marais () is a city and the county seat of Cook County, Minnesota, United States, of which it is the only municipality. It is on Lake Superior's North Shore. Grand Marais had a population of 1,337 at the 2020 census. Before it was settled by French Canadians and before Minnesota's statehood, it was inhabited by the Ojibwe. The National Scenic Byway begins in Grand Marais and ends near the border with Ontario. History The Ojibwe name for the area is ''Gichi-biitoobiig'', which means "great duplicate water," "parallel body of water" or "double body of water" (like a bayou), a reference to the two bays that form this large harbor of Lake Superior. The area was a bustling fur trading station in the 1700s, and the French Canadian Voyageurs termed the settled village "Grand Marais" ("Great Marsh"), referring to a marsh that, in early fur-trading times, was 20 acres (8.1 ha) or less in area, nearly at the level of Lake Superior, and at the head of the little bay and harbor that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minnesota
Minnesota () is a state in the upper midwestern region of the United States. It is the 12th largest U.S. state in area and the 22nd most populous, with over 5.75 million residents. Minnesota is home to western prairies, now given over to intensive agriculture; deciduous forests in the southeast, now partially cleared, farmed, and settled; and the less populated North Woods, used for mining, forestry, and recreation. Roughly a third of the state is covered in forests, and it is known as the "Land of 10,000 Lakes" for having over 14,000 bodies of fresh water of at least ten acres. More than 60% of Minnesotans live in the Minneapolis–Saint Paul metropolitan area, known as the "Twin Cities", the state's main political, economic, and cultural hub. With a population of about 3.7 million, the Twin Cities is the 16th largest metropolitan area in the U.S. Other minor metropolitan and micropolitan statistical areas in the state include Duluth, Mankato, Moorhead, Rochester, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fresnel
Augustin-Jean Fresnel (10 May 1788 – 14 July 1827) was a French civil engineer and physicist whose research in optics led to the almost unanimous acceptance of the wave theory of light, excluding any remnant of Newton's corpuscular theory, from the late 1830s until the end of the 19th century. He is perhaps better known for inventing the catadioptric (reflective/refractive) Fresnel lens and for pioneering the use of "stepped" lenses to extend the visibility of lighthouses, saving countless lives at sea. The simpler dioptric (purely refractive) stepped lens, first proposed by Count Buffon and independently reinvented by Fresnel, is used in screen magnifiers and in condenser lenses for overhead projectors. By expressing Huygens's principle of secondary waves and Young's principle of interference in quantitative terms, and supposing that simple colors consist of sinusoidal waves, Fresnel gave the first satisfactory explanation of diffraction by straight edges, including t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
