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Rock Of Ages Light
The Rock of Ages Light is a U.S. Coast Guard lighthouse on a small rock outcropping () approximately west of Washington Island and west of Isle Royale, in Eagle Harbor Township, Keweenaw County, Michigan (''see map below''). It is an active aid to navigation. History Overview The period between 1852 and the beginning of the 20th century saw great activity on the Great Lakes by the United States Lighthouse Board. Between 1852 and 1860 26 new lights were built. Even as the United States Civil War and its aftermath slowed construction, a dozen new lights were still lit in that decade. In the 1870s, 43 new lights were built on the Lakes. The 1880s saw more than one hundred lights constructed.''Beacons in the Night'', Clarke Historical Library. |
United States Coast Guard
The United States Coast Guard (USCG) is the maritime security, search and rescue, and law enforcement service branch of the United States Armed Forces and one of the country's eight uniformed services. The service is a maritime, military, multi-mission service unique among the United States military branches for having a maritime law enforcement mission with jurisdiction in both domestic and international waters and a federal regulatory agency mission as part of its duties. It is the largest and most powerful coast guard in the world, rivaling the capabilities and size of most navies. The U.S. Coast Guard is a humanitarian and security service. It protects the United States' borders and economic and security interests abroad; and defends its sovereignty by safeguarding sea lines of communication and commerce across vast territorial waters spanning 95,000 miles of coastline and its Exclusive Economic Zone. With national and economic security depending upon open global trade a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keweenaw County, Michigan
Keweenaw County (, ; , ) is a county in the Upper Peninsula of the U.S. state of Michigan, the state's northernmost county. As of the 2020 United States Census, the population was 2,046, making it Michigan's least populous county. It is also the state's largest county by total area, when the waters of Lake Superior are included in the total. The county seat is Eagle River. The county was set off and organized in 1861. It is believed "Keweenaw" is a corruption of an Ojibwe word that means "portage" or "place where portage is made"; compare the names of the nearby Portage Lake and Portage River which together make up the Keweenaw Waterway. Keweenaw County is part of the Houghton, Michigan, Micropolitan Statistical Area. Isle Royale, a national park which no longer has year-round inhabitants, was a separate county that was incorporated into Keweenaw County in 1897. Geography Two land masses comprise most of the land portion of the county: Isle Royale and the northeastern half ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brick
A brick is a type of block used to build walls, pavements and other elements in masonry construction. Properly, the term ''brick'' denotes a block composed of dried clay, but is now also used informally to denote other chemically cured construction blocks. Bricks can be joined using mortar, adhesives or by interlocking them. Bricks are usually produced at brickworks in numerous classes, types, materials, and sizes which vary with region and time period, and are produced in bulk quantities. ''Block'' is a similar term referring to a rectangular building unit composed of similar materials, but is usually larger than a brick. Lightweight bricks (also called lightweight blocks) are made from expanded clay aggregate. Fired bricks are one of the longest-lasting and strongest building materials, sometimes referred to as artificial stone, and have been used since circa 4000 BC. Air-dried bricks, also known as mud-bricks, have a history older than fired bricks, and have an additi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steel
Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistant typically need an additional 11% chromium. Because of its high tensile strength and low cost, steel is used in buildings, infrastructure, tools, ships, trains, cars, machines, electrical appliances, weapons, and rockets. Iron is the base metal of steel. Depending on the temperature, it can take two crystalline forms (allotropic forms): body-centred cubic and face-centred cubic. The interaction of the allotropes of iron with the alloying elements, primarily carbon, gives steel and cast iron their range of unique properties. In pure iron, the crystal structure has relatively little resistance to the iron atoms slipping past one another, and so pure iron is quite ductile, or soft and easily formed. In steel, small amounts of carbon, other ... [...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] |
Buoys
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] |
