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Timeline Of Three Longest Spans
This is the timeline of the three longest man-made spans in the world, all categories, that at least have the strength to carry some persons. It can be the span of any type of bridge, aerial tramway, power line, structural ceiling or dome etc. Overview In this timeline, only spans that were still standing in a particular year are considered for that year. This is perhaps more fair than a timeline of the records of all time, because the old figures might be incorrect. At the points when the old spans fall, new spans with more certain figures are allowed to appear in the timeline. This is a top-three list of existing longest spans ''per day''. When several structures of the same length exist, the oldest is counted as the longest. Some more rules for this timeline follow as: Only the length of the horizontal projection of the span, that is, the distance that can be measured on a map, counts. When the two supports have different heights above the sea level, the distance between th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Span (architecture)
Span is the distance between two intermediate supports for a structure, e.g. a beam (structure), beam or a bridge. A span can be closed by a solid beam or by a rope. The first kind is used for bridges, the second one for power lines, overhead telecommunication lines, some type of Antenna (radio), antennas or for aerial tramways. The span is a significant factor in finding the strength and size of a beam as it determines the maximum bending moment and Deflection (engineering), deflection. The maximum bending moment M_ and deflection \delta_in the pictured beam is found using: :M_ = \frac :\delta_ = \frac = \frac where :q = Uniformly distributed load :L = Length of the beam between two supports (span) :E = Modulus of elasticity :I = Area moment of inertia Note that the maximum bending moment and deflection occur midway between the two supports. From this it follows that if the span is doubled, the maximum moment (and with it the tensile stress, stress) will quadruple, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George Washington Bridge
The George Washington Bridge is a double-decked suspension bridge spanning the Hudson River, connecting Fort Lee, New Jersey, with Manhattan in New York City. The bridge is named after George Washington, the first president of the United States. The George Washington Bridge is the world's busiest motor vehicle bridge, carrying over 103million vehicles . It is owned by the Port Authority of New York and New Jersey, a bi-state government agency that operates infrastructure in the Port of New York and New Jersey. The George Washington Bridge is also informally known as the GW Bridge, the GWB, the GW, or the George, and was known as the Fort Lee Bridge or Hudson River Bridge during construction. The George Washington Bridge measures long and has a main span of . It was the longest main bridge span in the world from its 1931 opening until the Golden Gate Bridge opened in 1937. The George Washington Bridge is an important travel corridor within the New York metropolitan area. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kootenay Lake Crossing
Kootenay Lake Crossing is a powerline crossing of Kootenay Lake, British Columbia, Canada. The idea was to transport electricity from the Hydro dam on the Kootenay River at Brilliant to the Cominco Sullivan Mine at Kimberley. The most direct route was across Kootenay Lake. Originally it was with a span width of the longest powerline span of North America and fixed on three - for each conductor a single one - 19 metres tall towers at the west shore and a tall electricity pylon on the east shore. This tower was erected in spite of high mountains on the east shore for building short towers were available, as erecting span terminal towers on them would have required a longer span, for which the use of spliced conductors were required, which was undesired as the splicing point is a potential point of failure. Roebling cable provided the steel support cable for the conductor. The height of conductor over Kootenay Lake was . Kootenay Lake Crossing was inaugurated in 1952, but on March 8 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Omega Transmitter Bratland
OMEGA was the first global-range radio navigation system, operated by the United States in cooperation with six partner nations. It was a hyperbolic navigation system, enabling ships and aircraft to determine their position by receiving very low frequency (VLF) radio signals in the range 10 to 14 kHz, transmitted by a global network of eight fixed terrestrial radio beacons, using a navigation receiver unit. It became operational around 1971 and was shut down in 1997 in favour of the Global Positioning System. History Previous systems Taking a "fix" in any navigation system requires the determination of two measurements. Typically these are taken in relation to fixed objects like prominent landmarks or the known location of radio transmission towers. By measuring the angle to two such locations, the position of the navigator can be determined. Alternately, one can measure the angle and distance to a single object, or the distance to two objects. The introduction of radio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Menai Suspension Bridge
The Menai Suspension Bridge ( cy, Pont y Borth, Pont Grog y Borth) is a suspension bridge spanning the Menai Strait between the island of Anglesey and the mainland of Wales. Designed by Thomas Telford and completed in 1826, it was the world's first major suspension bridge. The bridge still carries road traffic and is a Grade I listed structure. Background The Menai Strait was created by glacial erosion along a line of weakness associated with the Menai Strait Fault System. During a series of Pleistocene glaciations (that lasted from about 2,580,000 to 11,700 years ago), a succession of ice-sheets moved from northeast to southwest across Anglesey and neighbouring Gwynedd, scouring the underlying rock and creating a series of linear bedrock hollows. The deepest of these channels eventually became flooded by the sea as the ice sheets receded, forming the Menai Strait. As Anglesey has been an island throughout recorded human history, the only way to reach it was by crossing the st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wheeling Suspension Bridge
The Wheeling Suspension Bridge is a suspension bridge spanning the main channel of the Ohio River at Wheeling, West Virginia. It was the largest suspension bridge in the world from 1849 until 1851. Charles Ellet Jr. (who also worked on the Niagara Falls Suspension Bridge) designed it and supervised construction of what became the first bridge to span a major river west of the Appalachian mountains. It linked the eastern and western section of the National Road, and became especially strategically important during the American Civil War. Litigation in the United States Supreme Court concerning its obstruction of the new high steamboat smokestacks eventually cleared the way for other bridges, especially needed by expanding railroads. Because this bridge was designed during the horse-and-buggy era, 2-ton weight limits and vehicle separation requirements applied in later years until it was closed to automobile traffic in September 2019. The main span is from tower to tower. The eas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John A
Sir John Alexander Macdonald (January 10 or 11, 1815 – June 6, 1891) was the first prime minister of Canada, serving from 1867 to 1873 and from 1878 to 1891. The dominant figure of Canadian Confederation, he had a political career that spanned almost half a century. Macdonald was born in Scotland; when he was a boy his family immigrated to Kingston in the Province of Upper Canada (today in eastern Ontario). As a lawyer, he was involved in several high-profile cases and quickly became prominent in Kingston, which elected him in 1844 to the legislature of the Province of Canada. By 1857, he had become premier under the colony's unstable political system. In 1864, when no party proved capable of governing for long, Macdonald agreed to a proposal from his political rival, George Brown, that the parties unite in a Great Coalition to seek federation and political reform. Macdonald was the leading figure in the subsequent discussions and conferences, which resulted in the Brit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Niagara Clifton Bridge
The Niagara Clifton Bridge, also known as the first Falls View Suspension Bridge, was a suspension bridge over the Niagara River between Niagara Falls, New York Niagara Falls is a City (New York), city in Niagara County, New York, United States. As of the 2020 United States Census, 2020 census, the city had a total population of 48,671. It is adjacent to the Niagara River, across from the city of Niagara ... and Clifton, Ontario. It was designed by Samuel Keefer, with construction starting in 1867. It was officially opened for traffic on January 2, 1869 and was destroyed in a storm on the night of January 9, 1889. Replacement Shortly following the collapse of the first Falls View Suspension Bridge, a second bridge of the same design was ordered to be built. Construction began on March 22, 1889 and erection work took only 38 days to complete. It was opened on May 7, only 117 days after the preceding bridge disaster. The second Falls View Suspension Bridge was dismantled in 1898 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brooklyn Bridge
The Brooklyn Bridge is a hybrid cable-stayed/ suspension bridge in New York City, spanning the East River between the boroughs of Manhattan and Brooklyn. Opened on May 24, 1883, the Brooklyn Bridge was the first fixed crossing of the East River. It was also the longest suspension bridge in the world at the time of its opening, with a main span of and a deck above mean high water. The span was originally called the New York and Brooklyn Bridge or the East River Bridge but was officially renamed the Brooklyn Bridge in 1915. Proposals for a bridge connecting Manhattan and Brooklyn were first made in the early 19th century, which eventually led to the construction of the current span, designed by John A. Roebling. The project's chief engineer, his son Washington Roebling, contributed further design work, assisted by the latter's wife, Emily Warren Roebling. Construction started in 1870, with the Tammany Hall-controlled New York Bridge Company overseeing construction, although nume ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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