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Chain Bridge (Nuremberg)
The Chain Bridge (german: Kettensteg) is a pedestrian chain bridge in Nuremberg, Germany. The bridge crosses the river Pegnitz just a few meters upriver of Fronveste and Schlayerturm, fortifications in the course of the medieval city wall guarding the river's exit from the town. It connects Maxplatz in Sebalder Altstadt (the old quarter north of the river) with Untere Kreuzgasse in Lorenz, the quarter on the south side of the river. The Chain Bridge was built in 1824 and is thus the oldest chain bridge on the European continent.Older examples were James Finley's Jacob's Creek Bridge in Pennsylvania, United States (1808, demolished 1833), and, in Great Britain, Dryburgh Abbey Bridge (1817) and 137 m Union Bridge (1820). Dufour's Saint Antoine Bridge in Geneva (1823) was the first wire cable suspension bridge. It was not given any specific name, but the public used to call it by what it appeared to be: a narrow pedestrian bridge (german: Steg) with chains (german: Ketten). T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pegnitz (river)
The Pegnitz () is a river in Franconia in the German state of Bavaria. The Pegnitz has its source in the town of the same name at an altitude of and meets the Rednitz at in Fürth to form the Regnitz river. But often esp. by local people the long Fichtenohe is regarded as upper course of the Pegnitz. The Fichtenohe source is in Lindenhardt Forest north of Pegnitz town. The Pegnitz is about long, with Fichtenohe . The river is inhabited by numerous ducks, coots, swans, and gulls. Tributaries * Fichtenohe (left tributary) * Flembach (left tributary) * Hirschbach (left tributary) * Högenbach (left tributary from the Pommelsbrunn direction) * Happurger Bach (left tributary) * Sittenbach (right tributary) * Hammerbach (left tributary) * Sandbach (left tributary) * Schnaittach (right tributary) * Röttenbach (right tributary) * Bitterbach (right tributary) * Röthenbach (left tributary) * Langwassergraben (right tributary) * Tiefgraben (right tributary) * Goldbach (left tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuremberg
Nuremberg ( ; german: link=no, Nürnberg ; in the local East Franconian dialect: ''Nämberch'' ) is the second-largest city of the German state of Bavaria after its capital Munich, and its 518,370 (2019) inhabitants make it the 14th-largest city in Germany. On the Pegnitz River (from its confluence with the Rednitz in Fürth onwards: Regnitz, a tributary of the Main (river), River Main) and the Rhine–Main–Danube Canal, it lies in the Bavarian Regierungsbezirk, administrative region of Middle Franconia, and is the largest city and the unofficial capital of Franconia. Nuremberg forms with the neighbouring cities of Fürth, Erlangen and Schwabach a continuous conurbation with a total population of 800,376 (2019), which is the heart of the urban area region with around 1.4 million inhabitants, while the larger Nuremberg Metropolitan Region has approximately 3.6 million inhabitants. The city lies about north of Munich. It is the largest city in the East Franconian dialec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Germany
Germany, officially the Federal Republic of Germany (FRG),, is a country in Central Europe. It is the most populous member state of the European Union. Germany lies between the Baltic and North Sea to the north and the Alps to the south. Its 16 constituent states have a total population of over 84 million in an area of . It borders Denmark to the north, Poland and Czechia to the east, Austria and Switzerland to the south, and France, Luxembourg, Belgium, and the Netherlands to the west. The nation's capital and most populous city is Berlin and its main financial centre is Frankfurt; the largest urban area is the Ruhr. Settlement in what is now Germany began in the Lower Paleolithic, with various tribes inhabiting it from the Neolithic onward, chiefly the Celts. Various Germanic tribes have inhabited the northern parts of modern Germany since classical antiquity. A region named Germania was documented before AD 100. In 962, the Kingdom of Germany formed the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Suspension Bridge
A suspension bridge is a type of bridge in which the deck is hung below suspension cables on vertical suspenders. The first modern examples of this type of bridge were built in the early 1800s. Simple suspension bridges, which lack vertical suspenders, have a long history in many mountainous parts of the world. Besides the bridge type most commonly called suspension bridges, covered in this article, there are other types of suspension bridges. The type covered here has cables suspended between towers, with vertical ''suspender cables'' that transfer the live and dead loads of the deck below, upon which traffic crosses. This arrangement allows the deck to be level or to arc upward for additional clearance. Like other suspension bridge types, this type often is constructed without the use of falsework. The suspension cables must be anchored at each end of the bridge, since any load applied to the bridge is transformed into a tension in these main cables. The main cables conti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wrought Iron
Wrought iron is an iron alloy with a very low carbon content (less than 0.08%) in contrast to that of cast iron (2.1% to 4%). It is a semi-fused mass of iron with fibrous slag inclusions (up to 2% by weight), which give it a wood-like "grain" that is visible when it is etched, rusted, or bent to failure. Wrought iron is tough, malleable, ductile, corrosion resistant, and easily forge welded, but is more difficult to weld electrically. Before the development of effective methods of steelmaking and the availability of large quantities of steel, wrought iron was the most common form of malleable iron. It was given the name ''wrought'' because it was hammered, rolled, or otherwise worked while hot enough to expel molten slag. The modern functional equivalent of wrought iron is mild steel, also called low-carbon steel. Neither wrought iron nor mild steel contain enough carbon to be hardenable by heating and quenching. Wrought iron is highly refined, with a small amount of silic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jacob's Creek Bridge (Pennsylvania)
Jacob's Creek Bridge (1801, demolished 1833) was the first iron-chain suspension bridge built in the United States. Designed by James Finley, a local judge and inventor, it spanned Jacob's Creek, just south of Mount Pleasant, Pennsylvania. Nothing of the bridge is thought to remain, but an area on the north side of Jacob's Creek – where Route 819 (Mount Pleasant Road) crosses – is still called "Iron Bridge." History Iron-chain suspension bridges had been built in China, England, and elsewhere in Europe. During the 1790s Finley served as a state senator in Philadelphia (then the state capital), and frequented the American Philosophical Society library. Eda Kranakis, an expert on early American suspension bridges, conjectures that Finley would have had access in Philadelphia to information about European bridges. Fayette County commissioners proposed the bridge in a March 1801 letter to the Westmoreland County board of commissioners. (Jacob's Creek forms part ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennsylvania
Pennsylvania (; (Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, Maryland to its south, West Virginia to its southwest, Ohio to its west, Lake Erie and the Canadian province of Ontario to its northwest, New York to its north, and the Delaware River and New Jersey to its east. Pennsylvania is the List of U.S. states and territories by population, fifth-most populous state in the nation with over 13 million residents 2020 United States census, as of 2020. It is the List of U.S. states and territories by area, 33rd-largest state by area and ranks List of states and territories of the United States by population density, ninth among all states in population density. The southeastern Delaware Valley metropolitan area comprises and surrounds Philadelphia, the state's List of cities in Pennsylvania, largest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., federal district, five major unincorporated territories, nine United States Minor Outlying Islands, Minor Outlying Islands, and 326 Indian reservations. The United States is also in Compact of Free Association, free association with three Oceania, Pacific Island Sovereign state, sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Palau, Republic of Palau. It is the world's List of countries and dependencies by area, third-largest country by both land and total area. It shares land borders Canada–United States border, with Canada to its north and Mexico–United States border, with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the List of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dryburgh Abbey Bridge
Dryburgh Abbey Bridge was a cable-stayed footbridge of significant historical interest erected near Dryburgh Abbey, in the Borders of Scotland. It connected the villages of Dryburgh and St. Boswells (part of a ribbon of settlements, including Newtown St. Boswells), across the River Tweed. A crossing had existed here for centuries, originally with a ferry service. The bridge had been commissioned by David Stewart Erskine, 11th Earl of Buchan, an eccentric Scottish aristocrat who later died in Dryburgh. It was long. At the time, the cable-stayed type of bridge was undergoing a period of rapid growth in popularity. The Earl opened the completed bridge on 1 August 1817, but in January 1818 it collapsed. One of the designers Thomas Smith described the collapse due to "high wind increasing to perfect hurricane, it carried off chain bridge, leaving only the fastenings and supports, the work of half a year, demolished in an hour...." After a redesign, a replacement was built, but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Union Bridge (Tweed)
The Union Chain Bridge or Union Bridge is a suspension bridge that spans the River Tweed between Horncliffe, Northumberland, England and Fishwick, Berwickshire, Scotland. It is four miles upstream of Berwick-upon-Tweed. When it opened in 1820 it was the longest wrought iron suspension bridge in the world with a span of , and the first vehicular bridge of its type in the United Kingdom. Although work started on the Menai Suspension Bridge first, the Union Bridge was completed earlier. Today it is the oldest suspension bridge still carrying road traffic and is a Category A listed building in Scotland, a Grade I listed building in England and an International Historic Civil Engineering Landmark. It lies on Sustrans Route 1 and the Pennine Cycleway. History Before the opening of the Union Bridge, crossing the river at this point involved an round trip via Berwick downstream or a trip via Coldstream upstream. (Ladykirk and Norham Bridge did not open until 1888.) The Tweed was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guillaume-Henri Dufour
Guillaume Henri Dufour (15 September 178714 July 1875) was a Swiss military officer, structural engineer and topographer. He served under Napoleon I and held the Swiss office of General four times in his career, firstly in 1847 when he led the Swiss Confederation forces to victory against the Sonderbund. In 1864 Dufour presided over the First Geneva Convention which established the International Red Cross. He was founder and president (1838 to 1865) of the Swiss Federal Office of Topography. Early life Dufour was born on 15 September 1787 in Konstanz,Peters, Tom F., ''"Transitions in Engineering: Guillaume Henri Dufour and the Early 19th Century Cable Suspension Bridges"'', Birkhauser, 1987, where his parents from Geneva were living in exile for their involvement in the Revolution of 1782. He was the son of Bénédict Dufour, a watchmaker, and Pernette Valentin. When he was two year old, his parents were allowed to return to Geneva, where Dufour attended school and studied ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eyebar
In structural engineering and construction, an eyebar is a straight bar, usually of metal, with a hole ("eye") at each end for fixing to other components. Eyebars are used in structures such as bridges, in settings in which only tension, and never compression, is applied. Also referred to as "pin - and eyebar construction" in instances where pins are being used. Structure A closed eyebar will typically have a rectangular cross section of constant thickness throughout its length and a constant width for all but the ends. The ends will transition to a wider part that is terminated by a rounded end. In the center of this end will be a hole which will receive a cylindrical pin, which may have provision to accept one or more nuts or bolts. If of round cross section the bar will typically be end-forged to create a head, which is then flatted by additional forging. The head may then be machined to a precise thickness and flatness. An alternative method for using round bar is to for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
