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Bailey Bridge
A Bailey bridge is a type of portable, pre-fabricated, truss bridge. It was developed in 1940–1941 by the British for military use during the Second World War and saw extensive use by British, Canadian and American military engineering units. A Bailey bridge has the advantages of requiring no special tools or heavy equipment to assemble. The wood and steel bridge elements were small and light enough to be carried in trucks and lifted into place by hand, without the use of a crane. The bridges were strong enough to carry tanks. Bailey bridges continue to be used extensively in civil engineering construction projects and to provide temporary crossings for pedestrian and vehicle traffic. A Bailey bridge and its construction were prominently featured in the 1977 film '' A Bridge Too Far''. Design The success of the Bailey bridge was due to the simplicity of the fabrication and assembly of its modular components, combined with the ability to erect and deploy sections with a minimu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meurthe River
The Meurthe () is a river in north-eastern France, right tributary to the river Moselle. It is long. Its source is in the Vosges mountains, near the Col de la Schlucht in the Vosges département, from where it flows in an overall north-westerly direction. Its name gave rise to the naming of the present French ''département'' Meurthe-et-Moselle and the former (before the change in the Franco-German border after the Franco-Prussian war of 1870) Meurthe Department, ''département'' Meurthe. Voies navigables de France, Channelled during its route through Nancy, France, Nancy, the river flows into the Moselle at Pompey, Meurthe-et-Moselle, Pompey on the northern edge of Nancy, a short distance down-stream from the Inland port, Port of Frouard. Towns along the river Meurthe include: * in Vosges: Fraize, Saint-Dié-des-Vosges, Raon-l'Étape * in Meurthe-et-Moselle: Baccarat, Meurthe-et-Moselle, Baccarat, Lunéville and Nancy, France, Nancy Tributaries include: * Fave * Rabodeau * Pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alloy
An alloy is a mixture of chemical elements of which at least one is a metal. Unlike chemical compounds with metallic bases, an alloy will retain all the properties of a metal in the resulting material, such as electrical conductivity, ductility, opacity (optics), opacity, and lustre (mineralogy), luster, but may have properties that differ from those of the pure metals, such as increased strength or hardness. In some cases, an alloy may reduce the overall cost of the material while preserving important properties. In other cases, the mixture imparts synergistic properties to the constituent metal elements such as corrosion resistance or mechanical strength. Alloys are defined by a metallic bonding character. The alloy constituents are usually measured by mass percentage for practical applications, and in Atomic ratio, atomic fraction for basic science studies. Alloys are usually classified as substitutional or interstitial alloys, depending on the atomic arrangement that forms the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ralph Freeman (1880–1950)
Sir Ralph Freeman (27 November 1880 – 11 March 1950) was an English structural engineer, responsible for the design of several of the world's most impressive bridges. Born in London, England, he studied at The Haberdashers' Aske's Boys' School and the City and Guilds of London Institute, and in 1901 joined Douglas Fox & Partners, a firm of consulting engineers specialising in the design of steel bridges. He rose to become senior partner and in 1938 the firm changed its name to Freeman Fox & Partners. Sir Ralph is best remembered for his design work on the Sydney Harbour Bridge and the Birchenough Bridge in the Chipinge area of Zimbabwe. His son, also called Ralph Freeman, was also an engineer, senior partner at Freeman Fox & Partners, and President of the Institution of Civil Engineers. He had been responsible for the design of the Humber Suspension Bridge. His grandson, Ralph Anthony Freeman, was also an engineer who worked on numerous bridges including The RAMA IX ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ministry Of Supply
The Ministry of Supply (MoS) was a department of the UK government formed in 1939 to co-ordinate the supply of equipment to all three British armed forces, headed by the Minister of Supply. A separate ministry, however, was responsible for aircraft production, and the Admiralty retained responsibilities for supplying the Royal Navy.Hornby (1958) During the war years the MoS was based at Shell Mex House in The Strand, London. The Ministry of Supply also took over all army research establishments in 1939. The Ministry of Aircraft Production was abolished in 1946, and the MoS took over its responsibilities for aircraft, including the associated research establishments. In the same year, it also took on increased responsibilities for atomic weapons, including the H-bomb development programme. The Ministry of Supply was abolished in late 1959 and its responsibilities passed to the Ministry of Aviation, the War Office, and the Air Ministry. The latter two ministries were subsequently ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
War Office
The War Office was a department of the British Government responsible for the administration of the British Army between 1857 and 1964, when its functions were transferred to the new Ministry of Defence (MoD). This article contains text from this source, which is available under th Open Government Licence v3.0 © Crown copyright It was equivalent to the Admiralty, responsible for the Royal Navy (RN), and (much later) the Air Ministry, which oversaw the Royal Air Force (RAF). The name 'War Office' is also given to the former home of the department, located at the junction of Horse Guards Avenue and Whitehall in central London. The landmark building was sold on 1 March 2016 by HM Government for more than £350 million, on a 250 year lease for conversion into a luxury hotel and residential apartments. Prior to 1855, 'War Office' signified the office of the Secretary at War. In the 17th and 18th centuries, a number of independent offices and individuals were re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United Kingdom
The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and Northern Ireland. The United Kingdom includes the island of Great Britain, the north-eastern part of the island of Ireland, and many smaller islands within the British Isles. Northern Ireland shares a land border with the Republic of Ireland; otherwise, the United Kingdom is surrounded by the Atlantic Ocean, the North Sea, the English Channel, the Celtic Sea and the Irish Sea. The total area of the United Kingdom is , with an estimated 2020 population of more than 67 million people. The United Kingdom has evolved from a series of annexations, unions and separations of constituent countries over several hundred years. The Treaty of Union between the Kingdom of England (which included Wales, annexed in 1542) and the Kingdom of Scotland in 170 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Civil Servant
The civil service is a collective term for a sector of government composed mainly of career civil servants hired on professional merit rather than appointed or elected, whose institutional tenure typically survives transitions of political leadership. A civil servant, also known as a public servant, is a person employed in the public sector by a government department or agency for public sector undertakings. Civil servants work for central and state governments, and answer to the government, not a political party. The extent of civil servants of a state as part of the "civil service" varies from country to country. In the United Kingdom (UK), for instance, only Crown (national government) employees are referred to as "civil servants" whereas employees of local authorities (counties, cities and similar administrations) are generally referred to as "local government civil service officers", who are considered public servants but not civil servants. Thus, in the UK, a civil servant is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Donald Bailey (civil Engineer)
Sir Donald Coleman Bailey, Order of the British Empire, OBE (15 September 1901 – 5 May 1985) was an England, English civil engineer who invented the Bailey bridge. Field Marshal Montgomery is recorded as saying that "without the Bailey bridge, we should not have won the war." Background Bailey attended Thomas Rotherham College, Rotherham Grammar School and The Leys School in Cambridge. He read for a Bachelor of Engineering, BEng degree at the University of Sheffield and graduated in 1923. Bailey was a civil servant in the War Office when he designed his bridge. Another engineer, A. M. Hamilton, successfully demonstrated that the Bailey bridge breached a patent on the Callender-Hamilton bridge, though the Bailey bridge was generally regarded as being superior for temporary use. Because the bridge used a pin joining system similar to that used in the Martel Bridge designed by Lt.-General Sir Giffard Le Quesne Martel, Hamilton also told the commission the Bailey bridge should ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bailey Bridge
A Bailey bridge is a type of portable, pre-fabricated, truss bridge. It was developed in 1940–1941 by the British for military use during the Second World War and saw extensive use by British, Canadian and American military engineering units. A Bailey bridge has the advantages of requiring no special tools or heavy equipment to assemble. The wood and steel bridge elements were small and light enough to be carried in trucks and lifted into place by hand, without the use of a crane. The bridges were strong enough to carry tanks. Bailey bridges continue to be used extensively in civil engineering construction projects and to provide temporary crossings for pedestrian and vehicle traffic. A Bailey bridge and its construction were prominently featured in the 1977 film '' A Bridge Too Far''. Design The success of the Bailey bridge was due to the simplicity of the fabrication and assembly of its modular components, combined with the ability to erect and deploy sections with a minimu ... [...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] |
Tank Track
Continuous track is a system of vehicle propulsion used in tracked vehicles, running on a continuous band of treads or track plates driven by two or more wheels. The large surface area of the tracks distributes the weight of the vehicle better than steel or rubber tires on an equivalent vehicle, enabling continuous tracked vehicles to traverse soft ground with less likelihood of becoming stuck due to sinking. Modern continuous tracks can be made with soft belts of synthetic rubber, reinforced with steel wires, in the case of lighter agricultural machinery. The more common classical type is a solid chain track made of steel plates (with or without rubber pads), also called caterpillar tread or tank tread, which is preferred for robust and heavy construction vehicles and military vehicles. The prominent treads of the metal plates are both hard-wearing and damage resistant, especially in comparison to rubber tyres. The aggressive treads of the tracks provide good trac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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