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Spectacle Reef Light
Spectacle Reef Light is a lighthouse east of the Straits of Mackinac and is located at the northern end of Lake Huron, Michigan. It was designed and built by Colonel Orlando Metcalfe Poe and Major Godfrey Weitzel, and was the most expensive lighthouse ever built on the Great Lakes. Because of the challenges of building on a shoal, including laying an underwater crib, it is said to be the "most spectacular engineering achievement" in lighthouse construction on Lake Huron. It took four years to build because weather limited work to mostly the summer season. Workers lived in a structure at the site; one of the limiting conditions. It ranks high as an engineering achievement among all the lighthouses built on the Great lakes. In 2020, ThSpectacle Reef Preservation Societywas formed and began to restore the lighthouse. History Overview From 1852 to the beginning of the 20th century, the United States Lighthouse Board was active in building lighthouses to support ship traffic on t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cheboygan County, Michigan
Cheboygan County ( ) is a county in the U.S. state of Michigan. As of the 2020 Census, the population was 25,579. The county seat is Cheboygan. The county boundaries were set off in 1840, with land partitioned from Mackinac County. The Cheboygan County government was organized in 1853. Etymology of the name Cheboygan The name of the county shares the same origin as that of the Cheboygan River, although the precise meaning is no longer known. It may have come from an Ojibwe word ''zhaabonigan,'' meaning "sewing needle". Alternatively, the origin may have been ''Chabwegan,'' meaning "a place of ore". It has also been described as "a Native American word first applied to the river. ''See'' List of Michigan county name etymologies. "Cheboygan" is pronounced the same as " Sheboygan" (a city in Wisconsin). Geography According to the U.S. Census Bureau, the county has a total area of , of which is land and (19%) is water. The county is considered to be part of Northern Michigan. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orlando Metcalfe Poe
Orlando Metcalfe Poe (March 7, 1832 – October 2, 1895) was a United States Army officer and engineer in the American Civil War. After helping General William Tecumseh Sherman's March to the Sea, he was responsible for much of the early lighthouse construction on the Great Lakes and design of the Poe Lock at Soo Locks between lakes Superior and Huron. Early life Orlando Metcalfe Poe was born in the midwestern city of Navarre, Ohio located in the Tuscarawas River valley. His parents were Charles Poe and Susannah Warner and he was the first of their five children. After going to local schools, he attended the United States Military Academy, graduating sixth in his class in 1856. From then until 1861 he served as an assistant topographical engineer on the survey of the northern Great Lakes; during this time he was promoted to first lieutenant. Famed ancestors Poe's great-great-grandparents were Catherine and George Jacob Pfau. They were of Palatine German descent, and their ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Focal Plane
In Gaussian optics, the cardinal points consist of three pairs of points located on the optical axis of a rotationally symmetric, focal, optical system. These are the '' focal points'', the principal points, and the nodal points. For ''ideal'' systems, the basic imaging properties such as image size, location, and orientation are completely determined by the locations of the cardinal points; in fact only four points are necessary: the focal points and either the principal or nodal points. The only ideal system that has been achieved in practice is the plane mirror, however the cardinal points are widely used to ''approximate'' the behavior of real optical systems. Cardinal points provide a way to analytically simplify a system with many components, allowing the imaging characteristics of the system to be approximately determined with simple calculations. Explanation The cardinal points lie on the optical axis of the optical system. Each point is defined by the effect the opti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buoy
A buoy () is a floating device that can have many purposes. It can be anchored (stationary) or allowed to drift with ocean currents. Types Navigational buoys * Race course marker buoys are used for buoy racing, the most prevalent form of yacht racing and power boat racing. They delimit the course and must be passed to a specified side. They are also used in underwater orienteering competitions. * Emergency wreck buoys provide a clear and unambiguous means of temporarily marking new wrecks, typically for the first 24–72 hours. They are coloured in an equal number of blue and yellow vertical stripes and fitted with an alternating blue and yellow flashing light. They were implemented following collisions in the Dover Strait in 2002 when vessels struck the new wreck of the . * Ice marking buoys mark holes in frozen lakes and rivers so snowmobiles do not drive over the holes. * Large Navigational Buoys (LNB, or Lanby buoys) are automatic buoys over 10 m high equipped with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fog Horn
A foghorn or fog signal is a device that uses sound to warn vehicles of navigational hazards such as rocky coastlines, or boats of the presence of other vessels, in foggy conditions. The term is most often used in relation to marine transport. When visual navigation aids such as lighthouses are obscured, foghorns provide an audible warning of rock outcrops, shoals, headlands, or other dangers to shipping. Description All foghorns use a vibrating column of air to create an audible tone, but the method of setting up this vibration differs. Some horns, such as the Daboll trumpet, used vibrating plates or metal reeds, a similar principle to a modern electric car horn. Others used air forced through holes in a rotating cylinder or disk, in the same manner as a siren. Semi-automatic operation of foghorns was achieved by using a clockwork mechanism (or "coder") to sequentially open the valves admitting air to the horns; each horn was given its own timing characteristics to help mariner ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wayne State University Press
Wayne State University Press (or WSU Press) is a university press that is part of Wayne State University. It publishes under its own name and also the imprints Painted Turtle and Great Lakes Books Series. History The Press has strong subject areas in Africana studies; fairy-tale and folklore studies; film, television, and media studies; Jewish studies; regional interest; and speech and language pathology. Wayne State University Press also publishes eleven academic journals, including ''Marvels & Tales'', and several trade publications, as well as the ''Made in Michigan Writers Series''. WSU Press is located in the Leonard N. Simons Building on Wayne State University's main campus. An editorial board approves the Wayne State University Press's titles. The board considers proposals and manuscripts presented by WSU Press's acquisitions department. WSU Press also has a Board of Visitors, dedicated to fundraising and advocacy in support of the Press. Officially, WSU Press is an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Central Michigan University
Central Michigan University (CMU) is a public research university in Mount Pleasant, Michigan. Established in 1892 as the Central Michigan Normal School and Business Institute, the private normal school became a state institution and renamed Central State Normal School in 1895 after the Michigan State Board of Education took over governance of the school. The institution came into its own as a university and gained its current name Central Michigan University in 1959 under the university's 6th president Judson W. Foust. CMU is one of the eight research universities in Michigan and is classified among "R2: Doctoral Universities – High research activity". It has more than 15,000 students on its Mount Pleasant campus. CMU offers 200 academic programs at the undergraduate, master's, specialist, and doctoral levels, including programs in entrepreneurship, journalism, music, audiology, teacher education, psychology, and physician assistant. The School of Engineering and Technology h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Civil War
The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States. It was fought between the Union ("the North") and the Confederacy ("the South"), the latter formed by states that had seceded. The central cause of the war was the dispute over whether slavery would be permitted to expand into the western territories, leading to more slave states, or be prevented from doing so, which was widely believed would place slavery on a course of ultimate extinction. Decades of political controversy over slavery were brought to a head by the victory in the 1860 U.S. presidential election of Abraham Lincoln, who opposed slavery's expansion into the west. An initial seven southern slave states responded to Lincoln's victory by seceding from the United States and, in 1861, forming the Confederacy. The Confederacy seized U.S. forts and other federal assets within their borders. Led by Confederate President Jefferson Davi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Lighthouse Board
The United States Lighthouse Board was the second agency of the U.S. federal government, under the Department of Treasury, responsible for the construction and maintenance of all lighthouses and navigation aids in the United States, between 1852 and 1910. The new agency was created following complaints of the shipping industry of the previous administration of lighthouses under the Treasury's Lighthouse Establishment, which had had jurisdiction since 1791, and since 1820, been under the control of Stephen Pleasonton. The quasi-military board first met on April 28, 1851, and with its establishment, the administration of lighthouses and other aids to navigation would take their largest leap toward modernization since the inception of federal government control.Amy K. Marshall "Frequently Close to the Point of Peril: A History of Buoys and Tenders in U.S. Coastal Waters, 1789–1939'", A Master's Thesis In 1910, the Lighthouse Board was disestablished in favor of a more civilian Li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Lakes
The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes in the mid-east region of North America that connect to the Atlantic Ocean via the Saint Lawrence River. There are five lakes, which are Lake Superior, Superior, Lake Michigan, Michigan, Lake Huron, Huron, Lake Erie, Erie, and Lake Ontario, Ontario and are in general on or near the Canada–United States border. Hydrologically, lakes Lake Michigan–Huron, Michigan and Huron are a single body joined at the Straits of Mackinac. The Great Lakes Waterway enables modern travel and shipping by water among the lakes. The Great Lakes are the largest group of freshwater lakes on Earth by total area and are second-largest by total volume, containing 21% of the world's surface fresh water by volume. The total surface is , and the total volume (measured at the low water datum) is , slightly less than the volume of Lake Baikal (, 22–23% of the world's surface fresh water ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Michigan
Michigan () is a state in the Great Lakes region of the upper Midwestern United States. With a population of nearly 10.12 million and an area of nearly , Michigan is the 10th-largest state by population, the 11th-largest by area, and the largest by area east of the Mississippi River.''i.e.'', including water that is part of state territory. Georgia is the largest state by land area alone east of the Mississippi and Michigan the second-largest. Its capital is Lansing, and its largest city is Detroit. Metro Detroit is among the nation's most populous and largest metropolitan economies. Its name derives from a gallicized variant of the original Ojibwe word (), meaning "large water" or "large lake". Michigan consists of two peninsulas. The Lower Peninsula resembles the shape of a mitten, and comprises a majority of the state's land area. The Upper Peninsula (often called "the U.P.") is separated from the Lower Peninsula by the Straits of Mackinac, a channel that joins Lak ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Straits Of Mackinac
The Straits of Mackinac ( ; french: Détroit de Mackinac) are the short waterways between the U.S. state of Michigan's Upper and Lower Peninsulas, traversed by the Mackinac Bridge. The main strait is wide with a maximum depth of , and connects two of the Great Lakes, Lake Michigan and Lake Huron. Hydrologically, the two connected lakes are one body of water, known as Lake Michigan–Huron. Historically, the native Odawa people called the region around the Straits Michilimackinac. The three islands forming the eastern edge of Straits of Mackinac include the two populated islands, the Bois Blanc and Mackinac, and one in between them that is uninhabited, the Round island. The Straits of Mackinac are major shipping lanes, providing passage for raw materials and finished goods and connecting, for instance, the iron mines of Minnesota to the steel mills of Gary, Indiana. Before the railroads reached Chicago from the east, most immigrants arrived in the Midwest and Great Plains by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
