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Tavistock Canal
The Tavistock Canal is a canal in the county of Devon in England. It was constructed early in the 19th century to link the town of Tavistock to Morwellham Quay on the River Tamar, where cargo could be loaded into ships. The canal is still in use to supply water to a hydro-electric power plant at Morwellham Quay, and forms part of the Cornwall and West Devon Mining Landscape World Heritage Site. It is unusual for a canal, as it has a gentle slope over its length, resulting in a considerable flow of water. History Morwellham Quay is on the River Tamar, and although it is about from the sea, the river is still tidal there. The quay was the furthest point inland to which the river was navigable, and it had served Tavistock as a port since the 12th century. Ships of 200 tons were using the quay by 1800, and there was a growing trade in copper, which was being mined locally, particularly since the Wheal Friendship mine had opened around 1797. In 1802, John Taylor, a local civil engin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canal
Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface flow under atmospheric pressure, and can be thought of as artificial rivers. In most cases, a canal has a series of dams and locks that create reservoirs of low speed current flow. These reservoirs are referred to as ''slack water levels'', often just called ''levels''. A canal can be called a ''navigation canal'' when it parallels a natural river and shares part of the latter's discharges and drainage basin, and leverages its resources by building dams and locks to increase and lengthen its stretches of slack water levels while staying in its valley. A canal can cut across a drainage divide atop a ridge, generally requiring an external water source above the highest elevation. The best-known example of such a canal is the Panama Canal. Many ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canal Inclined Plane
An inclined plane is a type of cable railway used on some canals for raising boats between different water levels. Boats may be conveyed afloat, in caissons, or may be carried in cradles or slings. History Inclined planes have evolved over the centuries. Some of the first were used by the Egyptians to bypass waterfalls on the Nile. These consisted of wooden slides covered with silt which reduced friction. Timeline *600BC – The Diolkos, an early Greek inclined plane, was in use. *385AD – Inclined planes were in use on the Grand Canal in China. *1167 – Nieuwedamme ''overtoom'' (a simple type of incline) was built at Ypres. *1568 – Wagon of Zafosina in use near Venice. *1777 – 3 inclined planes or 'dry wherries' began operation on Dukart's Canal, near Coalisland, in the south-east of County Tyrone in Ulster.''Hadfield's British Canals'' eighth edition Joseph Boughey Page 49 *1788 – An inclined plane was built by William Reynolds and used, for the first time in Engl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rivet
A rivet is a permanent mechanical fastener. Before being installed, a rivet consists of a smooth cylindrical shaft with a head on one end. The end opposite to the head is called the ''tail''. On installation, the rivet is placed in a punched or drilled hole, and the tail is ''upset'', or ''bucked'' (i.e., deformed), so that it expands to about 1.5 times the original shaft diameter, holding the rivet in place. In other words, the pounding or pulling creates a new "head" on the tail end by smashing the "tail" material flatter, resulting in a rivet that is roughly a dumbbell shape. To distinguish between the two ends of the rivet, the original head is called the ''factory head'' and the deformed end is called the ''shop head'' or buck-tail. Because there is effectively a head on each end of an installed rivet, it can support tension loads. However, it is much more capable of supporting shear loads (loads perpendicular to the axis of the shaft). Fastenings used in traditional w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rudder
A rudder is a primary control surface used to steer a ship, boat, submarine, hovercraft, aircraft, or other vehicle that moves through a fluid medium (generally aircraft, air or watercraft, water). On an aircraft the rudder is used primarily to counter adverse yaw and p-factor and is not the primary control used to turn the airplane. A rudder operates by redirecting the fluid past the hull (watercraft), hull or fuselage, thus imparting a turning or yaw (rotation), yawing motion to the craft. In basic form, a rudder is a flat plane or sheet of material attached with hinges to the craft's stern, tail, or after end. Often rudders are shaped so as to minimize Drag (physics), hydrodynamic or aerodynamic drag. On simple watercraft, a tiller—essentially, a stick or pole acting as a lever arm—may be attached to the top of the rudder to allow it to be turned by a helmsman. In larger vessels, cables, pushrods, or hydraulics may be used to link rudders to steering wheels. In typical air ... [...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 Inclusion (mineral), inclusions (up to 2% by weight), which give it a wood-like "grain" that is visible when it is etched, rusted, or bent to structural failure, failure. Wrought iron is tough, malleable, ductile, corrosion resistant, and easily forge welding, forge welded, but is more difficult to welding, 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 Carbon steel#Mild or low-carbon steel, mild steel, also called low-carbon steel. Neither wrought iron nor mild steel contain enough carbon to be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Devon And Tavistock Railway
The South Devon and Tavistock Railway linked Plymouth with Tavistock in Devon; it opened in 1859. It was extended by the Launceston and South Devon Railway to Launceston, in Cornwall in 1865. It was a broad gauge line but from 1876 also carried the standard gauge (then referred to as ''narrow gauge'') trains of the London and South Western Railway between Lydford and Plymouth: a third rail was provided, making a ''mixed gauge''. In 1892 the whole line was converted to standard gauge only. The line closed to passengers in 1962 although sections at either end were retained for a while to carry freight traffic. A short section has since been reopened as a preserved line by the Plym Valley Railway. History Getting the Tavistock line authorised The Plymouth and Dartmoor Railway, a horse-worked line, had been constructed to bring minerals from quarries near Princetown to Plymouth; it opened on 26 September 1823. The South Devon Railway (SDR) built its line from Exeter to Plymouth, o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devon Great Consols
Devon Great Consols was a copper mine near Tavistock in Devon. The lease on the site was taken from the Duke of Bedford in 1844 by a group of investors. The 1,024 shares, sold at one pound each, were divided among the six men. Earlier attempts to mine this property had all ended in failure. Work at the site began in August of the same year, when it was known as North Bedford Mines or Wheal Maria. By November 1844, a rich vein of copper ore was discovered at a depth of 20 fathoms under ground. After learning that the copper lode extended eastward for over two miles, the company quickly began opening other mines on its property. In the first six years of operation, nearly 90,000 tons of copper had come from Devon Great Consols. The mine was so productive, transport by horse and wagon could no longer handle the volume of copper it sent to the docks at Morwellham Quay. The company built its own railway, the Devon Great Consols Railway, to get its product to market; it was also nece ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tavistock, Devon
Tavistock ( ) is an ancient stannary and market town within West Devon, England. It is situated on the River Tavy from which its name derives. At the 2011 census the three electoral wards (North, South and South West) had a population of 13,028. It traces its recorded history back to at least 961 when Tavistock Abbey, whose ruins lie in the centre of the town, was founded. Its most famous son is Sir Francis Drake. History Middle Ages The area around Tavistock (formerly Tavistoke), where the River Tavy runs wide and shallow allowing it to be easily crossed, and near the secure high ground of Dartmoor, was inhabited long before historical records. The surrounding area is littered with archaeological remains from the Bronze and Iron Ages and it is believed a hamlet existed on the site of the present town long before the town's official history began, with the founding of the Abbey. The abbey of Saint Mary and Saint Rumon was founded in 961 by Ordgar, Earl of Devon. After destruct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Copper Ore
Following is a list of minerals that serve as copper ores in the copper mining Copper extraction refers to the methods used to obtain copper from its ores. The conversion of copper consists of a series of physical and electrochemical processes. Methods have evolved and vary with country depending on the ore source, loca ... process:Samans, Carl H. ''Engineering Metals and their Alloys'' MacMillan 1949 References {{DEFAULTSORT:Copper ores Copper ores Mining-related lists ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tramway (industrial)
Tramways are lightly laid rail transport, railways, sometimes with the wagons or carriages moved without locomotives. Because individual tramway infrastructure is not intended to carry the weight of typical standard-gauge railway equipment, the tramways over which they operate may be built from less substantial materials. Tramways can exist in many forms; sometimes just tracks temporarily placed on the ground to transport materials around a factory, mine or quarry. Many, if not most, use narrow-gauge railway technology. The trains can be manually pushed by hand, pulled by animals (especially horses and mules), cable hauled by a stationary engine, or use small, light locomotives. The term is not in use in North America but in common use in the United Kingdom, and elsewhere, where British Railway terminology and practices had large influences on management practices, terminology, and railway cultures such as Australia, New Zealand, and those parts of Asia that consulted with Bri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mill Hill, Devon
Mill may refer to: Science and technology * * Mill (grinding) * Milling (machining) * Millwork * Textile mill * Steel mill, a factory for the manufacture of steel * List of types of mill * Mill, the arithmetic unit of the Analytical Engine early computer People * Andy Mill (born 1953), American skier * Frank Mill (born 1958), German footballer * Harriet Taylor Mill (1807–1858), British philosopher and women's rights advocate * Henry Mill (c. 1683–1771), English inventor who patented the first typewriter * James Mill (1773–1836), Scottish historian, economist and philosopher * John Mill (theologian) (c. 1645–1707), English theologian and author of ''Novum Testamentum Graecum'' * John Stuart Mill (1806–1873), British philosopher and political economist, son of James Mill * Meek Mill, Robert Rihmeek Williams (born 1987), American rapper and songwriter Places * Mill en Sint Hubert, a Dutch municipality * Mill, Netherlands, a Dutch village * Mill, Missouri, a community ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
