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Sarah Mildred Long Bridge
The Sarah Mildred Long Bridge is a lift bridge spanning the Piscataqua River between Portsmouth, New Hampshire, and Kittery, Maine, carrying traffic of U.S. Route 1 Bypass. An original bridge by the same name was in operation from 1940 until 2016. A replacement span opened in March 2018. History The original Sarah Mildred Long Bridge was the third span to carry motor vehicle traffic between Maine and New Hampshire at Portsmouth, replacing a river crossing at its location dating from 1822. The bridge was the direct result of the work of the Maine-New Hampshire Interstate Bridge Authority, which had been formed in 1937. The major goal of the bridge project was to relieve congestion in downtown Portsmouth and Kittery, where U.S. Route 1 crossed the river via the Memorial Bridge, which had opened in 1923. The bridge was completed in 1940, a decade and a half before the United States embarked on construction of an ambitious Interstate Highway System. Original bridge The origina ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Piscataqua River
The Piscataqua River (Abenaki: ''Pskehtekwis'') is a tidal river forming the boundary of the U.S. states of New Hampshire and Maine from its origin at the confluence of the Salmon Falls River and Cochecho River. The drainage basin of the river is approximately , including the subwatersheds of the Great Works River and the five rivers flowing into Great Bay: the Bellamy, Oyster, Lamprey, Squamscott, and Winnicut. The river runs southeastward, with New Hampshire to the south and west and Maine to the north and east, and empties into the Gulf of Maine east of Portsmouth, New Hampshire. The last before the sea are known as Portsmouth Harbor and have a tidal current of around . The cities/towns of Portsmouth, New Castle, Newington, Kittery and Eliot have developed around the harbor. History Named by the area's original Abenaki inhabitants, the word ''Piscataqua'' is believed to be a combination of ''peske'' (branch) with ''tegwe'' (a river with a strong current, possibl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Retractable Bridge
A retractable bridge is a type of moveable bridge in which the deck can be rolled or slid backwards to open a gap while traffic crosses, usually a ship on a waterway. This type is sometimes referred to as a thrust bridge. Retractable bridges date back to medieval times. Due to the large dedicated area required for this type of bridge, this design is not common. A retractable design may be considered when the maximum horizontal clearance is required (for example, over a canal). Two remaining examples exist in New York City: the Carroll Street Bridge (built 1889) in Brooklyn, and the Borden Avenue Bridge in Queens. A recent example can be found at Queen Alexandra Dock in Cardiff, Wales, where the bridge is jacked upwards before being rolled on wheels. Helix Bridge at Paddington Basin in London is a more unusual example of the type, consisting of a glass shell supported in a helical steel frame, which rotates as it retracts. The Summer Street Bridge over Fort Point Channel in B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Berwick, Maine
South Berwick is a town in York County, Maine, United States. The population was 7,467 at the 2020 census. South Berwick is home to Berwick Academy, a private, co-educational university-preparatory day school founded in 1791. The town was set off from Berwick in 1814, followed by North Berwick in 1831. It is part of the Portland– South Portland–Biddeford, Maine metropolitan statistical area. The primary village in the town is the South Berwick census-designated place. History The area was called Newichawannock by the Abenaki Indians, meaning "river with many falls," a reference to the Salmon Falls River. It was first settled by Europeans about 1631 as a part of Kittery known as Kittery North Parish. Near the confluence with the Great Works River, Ambrose Gibbons built the Great House at Newichawannock, a palisaded trading post, to exchange goods with the Indians. In 1634, William Chadbourne, James Wall, and John Goddard arrived from England aboard the ship ''Pied C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boston & Maine Railroad
The Boston and Maine Railroad was a U.S. Class I railroad in northern New England. Originally chartered in 1835, it became part of what was the Pan Am Railways network in 1983 (most of which was purchased by CSX in 2022). At the end of 1970, B&M operated on of track, not including Springfield Terminal. That year it reported 2,744 million ton-miles of revenue freight and 92 million passenger-miles. History The Andover and Wilmington Railroad was incorporated March 15, 1833, to build a branch from the Boston and Lowell Railroad at Wilmington, Massachusetts, north to Andover, Massachusetts. The line opened to Andover on August 8, 1836. The name was changed to the Andover and Haverhill Railroad on April 18, 1837, reflecting plans to build further to Haverhill, Massachusetts (opened later that year), and yet further to Portland, Maine, with renaming to the Boston and Portland Railroad on April 3, 1839, opening to the New Hampshire state line in 1840. The Boston and Maine Railroad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thrust Block
A thrust block, also known as a thrust box, is a specialised form of thrust bearing used in ships, to resist the thrust of the propeller shaft and transmit it to the hull. Early thrust boxes Early screw-propelled steamships used a thrust block or ''thrust box'' composed of perhaps a dozen lower-rated plain thrust journal bearings stacked on the same shaft. These were problematic in service: they were bulky, difficult to dismantle, wasted power through friction and they had a tendency to overheat. The thrust box was built of a box-like cast iron housing with a radial bearing at each end and a number of collars formed on the shaft between them. This shaft was often a short section of removable shaft called the ''thrust shaft'', linking the engine ahead to the propeller shaft astern. A series of iron horseshoe-shaped collars fitted over the small diameter of the shaft and bore against the forward face of the shaft's collars. Each horseshoe was faced with a low-friction pad of babbit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sheave
A sheave () or pulley wheel is a grooved wheel often used for holding a belt, wire rope, or rope and incorporated into a pulley. The sheave spins on an axle or bearing inside the frame of the pulley. This allows the wire or rope to move freely, minimizing friction and wear on the cable. Sheaves can be used to redirect a cable or rope, lift loads, and transmit power. The words ''sheave'' and ''pulley'' are sometimes used interchangeably. Adjustable pulley A sheave can also refer to a pulley which has an adjustable operating diameter for use with a mechanical belt. This is accomplished by constructing the pulley out of several pieces. The two main "halves" of the pulley can be moved closer together or farther apart, thus altering the operational diameter. The usual construction is some sort of locking collar or set screws to secure the components, one half with a threaded central shaft and one half with a threaded center. By rotating the components, one can "screw" the parts ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trunnion
A trunnion (from Old French "''trognon''", trunk) is a cylindrical protrusion used as a mounting or pivoting point. First associated with cannons, they are an important military development. Alternatively, a trunnion is a shaft that positions and supports a tilting plate. This is a misnomer, as in reality it is a cradle for the true trunnion. In mechanical engineering (see the trunnion bearing section below), it is one part of a rotating joint where a shaft (the trunnion) is inserted into (and turns inside) a full or partial cylinder. Medieval history In a cannon, the trunnions are two projections cast just forward of the center of mass of the cannon and fixed to a two-wheeled movable gun carriage. As they allowed the muzzle to be raised and lowered easily, the integral casting of trunnions is seen by military historians as one of the most important advances in early field artillery. With the creation of larger and more powerful siege guns in the early 15th century, a n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Burlington, Vermont
Burlington is the most populous city in the U.S. state of Vermont and the seat of Chittenden County. It is located south of the Canada–United States border and south of Montreal. As of the 2020 U.S. census, the population was 44,743. It ranks as the least populous city in the United States to also be the most populous city in its state. A regional college town, Burlington is home to Champlain College and the University of Vermont (UVM). Vermont's largest hospital, the UVM Medical Center, is within the city limits. The City of Burlington owns Vermont's largest airport, the Burlington International Airport, located in neighboring South Burlington. In 2015, Burlington became the first city in the U.S. to run entirely on renewable energy. History Early history to early 20th century Two theories have been put forward regarding the origin of Burlington's name. The first is that it was named after Richard Boyle, 3rd Earl of Burlington, and the second is that the name ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Burlington Free Press
''The Burlington Free Press'' (sometimes referred to as "BFP" or "the Free Press") is a digital and print community news organization based in Burlington, Vermont, and owned by Gannett. It is one of the official "newspapers of record" for the State of Vermont. It was founded on June 15, 1827, as a weekly paper and turned daily in 1848 in response to the invention of the telegraph. Today, the ''Burlington Free Press'' is part of the USA Today Network and offers local news coverage both in print and online. Free Press Media, a division of the ''Burlington Free Press'', is a comprehensive media company that creates, implements and manages online and print marketing campaigns for local and national businesses. ''Free Press Media'' is the B2B marketing branch of the ''Burlington Free Press'' and is able to utilize the reach and coverage of the news organization to target audiences on behalf of local companies. Current format The Burlington Free Press print product is a “tall t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Boston Globe
''The Boston Globe'' is an American daily newspaper founded and based in Boston, Massachusetts. The newspaper has won a total of 27 Pulitzer Prizes, and has a total circulation of close to 300,000 print and digital subscribers. ''The Boston Globe'' is the oldest and largest daily newspaper in Boston. Founded in 1872, the paper was mainly controlled by Irish Catholic interests before being sold to Charles H. Taylor and his family. After being privately held until 1973, it was sold to ''The New York Times'' in 1993 for $1.1billion, making it one of the most expensive print purchases in U.S. history. The newspaper was purchased in 2013 by Boston Red Sox and Liverpool owner John W. Henry for $70million from The New York Times Company, having lost over 90% of its value in 20 years. The newspaper has been noted as "one of the nation's most prestigious papers." In 1967, ''The Boston Globe'' became the first major paper in the U.S. to come out against the Vietnam War. The paper's 2002 c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Piscataqua River Bridge
The Piscataqua River Bridge is a through arch bridge that crosses the Piscataqua River, connecting Portsmouth, New Hampshire with Kittery, Maine. Carrying six lanes of Interstate 95, the bridge is the third modern span and first fixed crossing of the Piscataqua between Portsmouth and Kittery. The two other spans, the Memorial Bridge and the Sarah Mildred Long Bridge, are both lift bridges, built to accommodate ship traffic along the Piscataqua. The high arch design of the Piscataqua River Bridge eliminates the need for a movable roadway. History The development of the Interstate Highway System required new roadbeds to be constructed and existing ones to be absorbed into the network. In New Hampshire, Interstate 95 was routed along the New Hampshire Turnpike, which had opened to traffic in 1950, and paralleled U.S. Route 1 through New Hampshire's Seacoast region from the Massachusetts border to the Turnpike's end at the Portsmouth Traffic Circle. A gap remained between the t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interstate Highway Standards
Standards for Interstate Highways in the United States are defined by the American Association of State Highway and Transportation Officials (AASHTO) in the publication ''A Policy on Design Standards: Interstate System''. For a certain highway to be considered an Interstate Highway, it must meet these construction requirements or obtain a waiver from the Federal Highway Administration. Standards Standardization helps keep road design consistent, such that drivers can learn the consistent features and drive accordingly. Standardization can therefore decrease accidents and increase driver safety. These standards are, : * Controlled access: All access onto and off the highway is to be controlled access, controlled with Interchange (road), interchanges and grade separations, including all railroad crossings. Interchanges are to provide access to and from both directions of the highway and both directions of the crossroad. Interchanges should be spaced at least apart in urban ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
