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Hereford Road Skew Bridge
Hereford Road Skew Bridge is a disused railway bridge in Ledbury, Herefordshire. Built in 1881 to carry the Ledbury and Gloucester Railway across the Hereford Road at an angle of approximately 45°, it was built as a ribbed skew arch with stone spandrels and wing walls, and ribs of blue brick. The railway line was closed in 1959 and the bridge is now used as part of the Ledbury Town Trail footpath. History The Herefordshire and Gloucestershire Canal opened in two phases in 1798 and 1845, but in 1863, after a period of financial difficulty, it was leased to the Great Western Railway and in 1881 work started on converting the southern section into a railway. The Ross and Ledbury Railway Company's intention was to build a line between Ledbury and Ross-on-Wye via Dymock, where the Newent Railway Company planned a junction and a line that would link to the Great Western Railway at Over Junction, west of Gloucester. Both companies received Parliamentary approval in 1873, but d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ledbury
Ledbury is a market town and civil parish in the county of Herefordshire, England, lying east of Hereford, and west of the Malvern Hills. It has a significant number of timber-framed structures, in particular along Church Lane and High Street. One of the most outstanding is Ledbury Market Hall, built in 1617, located in the town centre. Other notable buildings include the parish church of St. Michael and All Angels, the Painted Room (containing sixteenth-century frescoes), the Old Grammar School, the Barrett-Browning memorial clock tower (designed by Brightwen Binyon and opened in 1896 to house the library until 2015), nearby Eastnor Castle and the St. Katherine's Hospital site. Founded , this is a rare surviving example of a hospital complex, with hall, chapel, a Master's House (fully restored and opened in March 2015 to house the Library), almshouses and a timber-framed barn. History Ledbury is a borough whose origins date to around AD 690. In the Domesday Book it was recor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Single Track (rail)
A single-track railway is a railway where trains traveling in both directions share the same track. Single track is usually found on lesser-used rail lines, often branch lines, where the level of traffic is not high enough to justify the cost of constructing and maintaining a second track. Advantages and disadvantages Single track is significantly cheaper to build and maintain, but has operational and safety disadvantages. For example, a single-track line that takes 15 minutes to travel through would have capacity for only two trains per hour in each direction safely. By contrast, a double track with signal boxes four minutes apart can allow up to 15 trains per hour in each direction safely, provided all the trains travel at the same speed. This hindrance on the capacity of a single track may be partly overcome by making the track one-way on alternate days, if the single track is not used for public passenger transit. Long freight trains are a problem if the passing s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Imperial Units
The imperial system of units, imperial system or imperial units (also known as British Imperial or Exchequer Standards of 1826) is the system of units first defined in the British Weights and Measures Act 1824 and continued to be developed through a series of Weights and Measures Acts and amendments. The imperial system developed from earlier English units as did the related but differing system of customary units of the United States. The imperial units replaced the Winchester Standards, which were in effect from 1588 to 1825. The system came into official use across the British Empire in 1826. By the late 20th century, most nations of the former empire had officially adopted the metric system as their main system of measurement, but imperial units are still used alongside metric units in the United Kingdom and in some other parts of the former empire, notably Canada. The modern UK legislation defining the imperial system of units is given in the Weights and Measures Act ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wythe
A wythe is a continuous vertical section of masonry one unit in thickness. A wythe may be independent of, or interlocked with, the adjoining wythe(s). A single wythe of brick that is not structural in nature is referred to as a masonry veneer Masonry veneer walls consist of a single non-structural external layer of masonry, typically made of brick, stone or manufactured stone. Masonry veneer can have an air space behind it and is technically called "anchored veneer". A masonry veneer .... A multiple-wythe masonry wall may be composed of a single type of masonry unit layered to increase its thickness and structural strength, or different masonry units chosen by function, such as an economical concrete block serving a structural purpose and a more expensive brick chosen for its appearance. In the Eurocodes the continuous vertical section is referred to as a 'leaf'. A single-leaf wall is a wall without a cavity or continuous vertical joint in its plane. A double-leaf wall is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brickwork
Brickwork is masonry produced by a bricklayer, using bricks and mortar. Typically, rows of bricks called '' courses'' are laid on top of one another to build up a structure such as a brick wall. Bricks may be differentiated from blocks by size. For example, in the UK a brick is defined as a unit having dimensions less than and a block is defined as a unit having one or more dimensions greater than the largest possible brick. Brick is a popular medium for constructing buildings, and examples of brickwork are found through history as far back as the Bronze Age. The fired-brick faces of the ziggurat of ancient Dur-Kurigalzu in Iraq date from around 1400 BC, and the brick buildings of ancient Mohenjo-daro in Pakistan were built around 2600 BC. Much older examples of brickwork made with dried (but not fired) bricks may be found in such ancient locations as Jericho in Palestine, Çatal Höyük in Anatolia, and Mehrgarh in Pakistan. These structures have survived from the Stone Ag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Course (architecture)
A course is a layer of the same unit running horizontally in a wall. It can also be defined as a continuous row of any masonry unit such as bricks, concrete masonry units (CMU), stone, shingles, tiles, etc. Coursed masonry construction arranges units in regular courses. Oppositely, coursed rubble masonry construction uses random uncut units, infilled with mortar or smaller stones. If a course is the horizontal arrangement, then a wythe is a continuous vertical section of masonry one unit in thickness. A wythe may be independent of, or interlocked with, the adjoining wythe(s). A single wythe of brick that is not structural in nature is referred to as a masonry veneer. A standard 8-inch CMU block is exactly equal to three courses of brick. A bond (or bonding) pattern) is the arrangement of several courses of brickwork. The corners of a masonry wall are built first, then the spaces between them are filled by the remaining courses. Orientations Masonry coursing can be arrang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Circular Segment
In geometry, a circular segment (symbol: ), also known as a disk segment, is a region of a disk which is "cut off" from the rest of the disk by a secant or a chord. More formally, a circular segment is a region of two-dimensional space that is bounded by a circular arc (of less than π radians by convention) and by the circular chord connecting the endpoints of the arc. Formulae Let ''R'' be the radius of the arc which forms part of the perimeter of the segment, ''θ'' the central angle subtending the arc in radians, ''c'' the chord length, ''s'' the arc length, ''h'' the sagitta (height) of the segment, ''d'' the apothem of the segment, and ''a'' the area of the segment. Usually, chord length and height are given or measured, and sometimes the arc length as part of the perimeter, and the unknowns are area and sometimes arc length. These can't be calculated simply from chord length and height, so two intermediate quantities, the radius and central angle are usually calcula ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arch
An arch is a vertical curved structure that spans an elevated space and may or may not support the weight above it, or in case of a horizontal arch like an arch dam, the hydrostatic pressure against it. Arches may be synonymous with vaults, but a vault may be distinguished as a continuous arch forming a roof. Arches appeared as early as the 2nd millennium BC in Mesopotamian brick architecture, and their systematic use started with the ancient Romans, who were the first to apply the technique to a wide range of structures. Basic concepts An arch is a pure compression form. It can span a large area by resolving forces into compressive stresses, and thereby eliminating tensile stresses. This is sometimes denominated "arch action". As the forces in the arch are transferred to its base, the arch pushes outward at its base, denominated "thrust". As the rise, i. e. height, of the arch decreases the outward thrust increases. In order to preserve arch action and prevent collapse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skew Arch
A skew arch (also known as an oblique arch) is a method of construction that enables an arch bridge to span an obstacle at some angle other than a right angle. This results in the faces of the arch not being perpendicular to its abutments and its plan view being a parallelogram, rather than the rectangle that is the plan view of a regular, or "square" arch. In the case of a masonry skew arch, the construction requires precise stonecutting, as the cuts do not form right angles, but once the principles were fully understood in the early 19th century, it became considerably easier and cheaper to build a skew arch of brick. The problem of building skew arch masonry bridges was addressed by a number of early civil engineers and mathematicians, including Giovanni Barbara (1726), William Chapman (1787), Benjamin Outram (1798), Peter Nicholson (1828), George Stephenson (1830), Edward Sang (1835), Charles Fox (1836), George W. Buck (1839) and William Froude (''c.'' 1844). History ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southdown Road Skew Bridge
Southdown Road Skew Bridge is a ribbed skew arch railway bridge, which carries the Midland Main Line across Southdown Road in Harpenden, Hertfordshire. Built of brick by the Midland Railway and opening in 1868, it is notable for its extreme skew angle of approximately 65°. History Located approximately south of Harpenden station, the bridge was built to carry a double-track standard gauge railway line across Southdown Road, which borders Harpenden Common in Hertfordshire, as part of the Midland Railway's southern extension towards its London terminus at St Pancras, and opened to traffic in 1868. Owing to the highly acute angle at which the railway crosses the road the bridge was built as a ribbed arch, a variation of the "false" skew arch and a design championed by French civil engineer A. Boucher. The bridge was widened in 1893 when the line was converted to quadruple track. On 1 January 1923 ownership of the bridge, along with the rest of the line, passed to the Lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandstone
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) because they are the most resistant minerals to weathering processes at the Earth's surface. Like uncemented sand, sandstone may be any color due to impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Since sandstone beds often form highly visible cliffs and other topographic features, certain colors of sandstone have been strongly identified with certain regions. Rock formations that are primarily composed of sandstone usually allow the percolation of water and other fluids and are porous enough to store large quantities, making them valuable aquifers and petroleum reservoirs. Quartz-bearing sandstone can be changed into quartzite through metamorphism, usually related to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rustication (architecture)
Two different styles of rustication in the Palazzo Medici-Riccardi in Florence; smooth-faced above and rough-faced below.">Florence.html" ;"title="Palazzo Medici-Riccardi in Florence">Palazzo Medici-Riccardi in Florence; smooth-faced above and rough-faced below. Rustication is a range of masonry techniques used in classical architecture giving visible surfaces a finish texture that contrasts with smooth, squared-block masonry called ashlar. The visible face of each individual block is cut back around the edges to make its size and placing very clear. In addition the central part of the face of each block may be given a deliberately rough or patterned surface. Rusticated masonry is usually "dressed", or squared off neatly, on all sides of the stones except the face that will be visible when the stone is put in place. This is given wide joints that emphasize the edges of each block, by angling the edges ("channel-jointed"), or dropping them back a little. The main part of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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