1.
Edmonton, London
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Edmonton is an area in the east of the London Borough of Enfield, England,8.6 miles north-north-east of Charing Cross. It has a history as a settlement distinct from Enfield. Edmonton is 8.6 miles north-north-east of Charing Cross and stretches from just south of the North Circular Road where it borders Tottenham to its boundary with Ponders End to the north. Bush Hill Park, Winchmore Hill and Palmers Green adjoin the western boundary while the River Lee Diversion forms Edmontons eastern boundary with Chingford, the northern part of Edmonton, N9 postal area is known as Lower Edmonton and the southern part as Upper Edmonton, N18 postal area. The old highway Ermine Street passed through what is today Edmonton, Ermine Street was the main Roman Road from London through Lincoln and on to York. Edmonton appears in the Domesday Book of 1086, where it is recorded as Adelmetone- a farmstead or estate of a man called Ēadhelm from an Old English personal name and tūn. Local government in the modern sense began in 1837 with the Edmonton Union and this also covered a wide district of 47,102 acres, including the modern boroughs of Haringey and Enfield, plus Cheshunt, Waltham Abbey and Waltham Cross. The town hall was built in 1884 and extended in 1903, the population of this area grew rapidly, reaching 445,875 by 1911 and would today be about 615,000. As the population mushroomed Middlesex was subdivided into many local government areas. At the 1961 census the borough had a population of 91,956 and this was absorbed into the London Borough of Enfield in 1965, and the former Town Hall and civic buildings were controversially demolished by Enfield Council in 1989. Pymmes Park with its walled garden is Upper Edmontons park. Pymmes Park originated as a private estate, in the late 16th century it was owned by the powerful Cecil family. In 1589 Robert Cecil, later 1st Earl of Salisbury, spent his honeymoon at Pymmes, Cecil was a protege of Francis Walsingham, Elizabeth Is chief spymaster and he succeeded him as Secretary of State in 1590. The estate was acquired by Edmonton Council and opened as a public park in 1906. Pymmes House was destroyed by fire during World War II and the remains were demolished, in the 17th century the then rural Edmonton had a reputation for supernatural activities. In approximately 1600, a play entitled The Merry Devil of Edmonton was performed in London about a wizard who lived there, the historic All Saints Church is situated in Church Street as is Lambs Cottage, which was home to writers Charles Lamb and Mary Lamb. John Keats, the poet, was apprenticed to surgeon Dr. Hammond in Church Street between 1810-1816, the house was demolished in 1931 to be replaced by Keats Parade. An extant shop carries a plaque in commemoration
2.
London
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London /ˈlʌndən/ is the capital and most populous city of England and the United Kingdom. Standing on the River Thames in the south east of the island of Great Britain and it was founded by the Romans, who named it Londinium. Londons ancient core, the City of London, largely retains its 1. 12-square-mile medieval boundaries. London is a global city in the arts, commerce, education, entertainment, fashion, finance, healthcare, media, professional services, research and development, tourism. It is crowned as the worlds largest financial centre and has the fifth- or sixth-largest metropolitan area GDP in the world, London is a world cultural capital. It is the worlds most-visited city as measured by international arrivals and has the worlds largest city airport system measured by passenger traffic, London is the worlds leading investment destination, hosting more international retailers and ultra high-net-worth individuals than any other city. Londons universities form the largest concentration of education institutes in Europe. In 2012, London became the first city to have hosted the modern Summer Olympic Games three times, London has a diverse range of people and cultures, and more than 300 languages are spoken in the region. Its estimated mid-2015 municipal population was 8,673,713, the largest of any city in the European Union, Londons urban area is the second most populous in the EU, after Paris, with 9,787,426 inhabitants at the 2011 census. The citys metropolitan area is the most populous in the EU with 13,879,757 inhabitants, the city-region therefore has a similar land area and population to that of the New York metropolitan area. London was the worlds most populous city from around 1831 to 1925, Other famous landmarks include Buckingham Palace, the London Eye, Piccadilly Circus, St Pauls Cathedral, Tower Bridge, Trafalgar Square, and The Shard. The London Underground is the oldest underground railway network in the world, the etymology of London is uncertain. It is an ancient name, found in sources from the 2nd century and it is recorded c.121 as Londinium, which points to Romano-British origin, and hand-written Roman tablets recovered in the city originating from AD 65/70-80 include the word Londinio. The earliest attempted explanation, now disregarded, is attributed to Geoffrey of Monmouth in Historia Regum Britanniae and this had it that the name originated from a supposed King Lud, who had allegedly taken over the city and named it Kaerlud. From 1898, it was accepted that the name was of Celtic origin and meant place belonging to a man called *Londinos. The ultimate difficulty lies in reconciling the Latin form Londinium with the modern Welsh Llundain, which should demand a form *lōndinion, from earlier *loundiniom. The possibility cannot be ruled out that the Welsh name was borrowed back in from English at a later date, and thus cannot be used as a basis from which to reconstruct the original name. Until 1889, the name London officially applied only to the City of London, two recent discoveries indicate probable very early settlements near the Thames in the London area
3.
Steam wagon
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A steam wagon is a steam-powered road vehicle for carrying freight. It was the earliest form of lorry and came in two forms, overtype and undertype – the distinction being the position of the engine relative to the boiler. Manufacturers tended to concentrate on one form or the other, competition from internal-combustion-powered vehicles and adverse legislation meant that few remained in commercial use beyond the Second World War. Although the majority of wagons have been scrapped, a significant number have been preserved in working order and may be seen in operation at steam fairs. The steam wagon came in two basic forms, the overtype designs looked like a cross between a traction engine and a lorry. The front resembled a traction engine by having a cab built around a horizontal boiler with a round smokebox. The back resembled a lorry in having a body and being built around a chassis. The undertype designs have the engine under the chassis, and generally resemble motor lorries rather than traction engines, undertype designs often had the benefit of a more enclosed cab, and a much shorter length for the same carrying capacity. The earliest examples of either type had steel or wooden wheels, various developments, such as fully enclosed cabs and pneumatic tyres, were later tried by companies in a bid to compete with internal combustion engine-powered lorries. Some wagons built to run on solid tyres were later converted to pneumatic tyres, prior to this point, goods were carried in a trailer towed behind a traction engine, or more frequently a horse. Despite legislation that restricted the unladen weight of wagons, steam wagon production began to flourish in the UK in the last decade of the 19th century. Manufacturers such as the Lancashire Steam Motor Company, Coulthard, Mann, Straker, in 1901, several makers competed in the Aldershot trials for the War Department, with Thornycrofts gear driven undertype coming out as the winner ahead of Fodens early chain driven overtype. Both manufacturers built on early success, with Foden patenting the essential features of the overtype wagon. Around this time the Yorkshire Patent Steam Wagon company began producing undertype wagons with their pattern of double ended boiler. In this period, many manufacturers made attempts to build steam wagons, in 1906, Alley & McLellan launched the first Sentinel wagon, driven by a well designed, rugged engine with poppet valves, and an effective superheated vertical cross watertube boiler. It was a design, and immediately took a large share of the market. Also in 1906, Wallis & Steevens produced an overtype wagon that Foden viewed as an infringement of their patent, the matter led to a patent infringement case. In 1908 the matter was decided in Wallis & Steevens favour and this opened up the home market for many other manufacturers to fill the vacuum
4.
World War I
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World War I, also known as the First World War, the Great War, or the War to End All Wars, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918. More than 70 million military personnel, including 60 million Europeans, were mobilised in one of the largest wars in history and it was one of the deadliest conflicts in history, and paved the way for major political changes, including revolutions in many of the nations involved. The war drew in all the worlds great powers, assembled in two opposing alliances, the Allies versus the Central Powers of Germany and Austria-Hungary. These alliances were reorganised and expanded as more nations entered the war, Italy, Japan, the trigger for the war was the assassination of Archduke Franz Ferdinand of Austria, heir to the throne of Austria-Hungary, by Yugoslav nationalist Gavrilo Princip in Sarajevo on 28 June 1914. This set off a crisis when Austria-Hungary delivered an ultimatum to the Kingdom of Serbia. Within weeks, the powers were at war and the conflict soon spread around the world. On 25 July Russia began mobilisation and on 28 July, the Austro-Hungarians declared war on Serbia, Germany presented an ultimatum to Russia to demobilise, and when this was refused, declared war on Russia on 1 August. Germany then invaded neutral Belgium and Luxembourg before moving towards France, after the German march on Paris was halted, what became known as the Western Front settled into a battle of attrition, with a trench line that changed little until 1917. On the Eastern Front, the Russian army was successful against the Austro-Hungarians, in November 1914, the Ottoman Empire joined the Central Powers, opening fronts in the Caucasus, Mesopotamia and the Sinai. In 1915, Italy joined the Allies and Bulgaria joined the Central Powers, Romania joined the Allies in 1916, after a stunning German offensive along the Western Front in the spring of 1918, the Allies rallied and drove back the Germans in a series of successful offensives. By the end of the war or soon after, the German Empire, Russian Empire, Austro-Hungarian Empire, national borders were redrawn, with several independent nations restored or created, and Germanys colonies were parceled out among the victors. During the Paris Peace Conference of 1919, the Big Four imposed their terms in a series of treaties, the League of Nations was formed with the aim of preventing any repetition of such a conflict. This effort failed, and economic depression, renewed nationalism, weakened successor states, and feelings of humiliation eventually contributed to World War II. From the time of its start until the approach of World War II, at the time, it was also sometimes called the war to end war or the war to end all wars due to its then-unparalleled scale and devastation. In Canada, Macleans magazine in October 1914 wrote, Some wars name themselves, during the interwar period, the war was most often called the World War and the Great War in English-speaking countries. Will become the first world war in the sense of the word. These began in 1815, with the Holy Alliance between Prussia, Russia, and Austria, when Germany was united in 1871, Prussia became part of the new German nation. Soon after, in October 1873, German Chancellor Otto von Bismarck negotiated the League of the Three Emperors between the monarchs of Austria-Hungary, Russia and Germany
5.
De Dion-Bouton
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De Dion-Bouton was a French automobile manufacturer and railcar manufacturer operating from 1883 to 1932. The company was founded by the Marquis Jules-Albert de Dion, Georges Bouton, the company was formed after de Dion in 1881 saw a toy locomotive in a store window and asked the toymakers to build another. Engineers Bouton and Trépardoux had been eking a living on scientific toys at a shop in the Passage de Léon, Trépardoux had long dreamed of building a steam car, but neither could afford it. De Dion, already inspired by steam and with money, agreed. This became the De Dion-Bouton automobile company, the worlds largest automobile manufacturer for a time, becoming known for their quality, reliability. Before 1883 was over they had set up shop in larger premises in the Passage de Léon, Paris, tried and dropped steam engines for boats, and produced a steam car. With the boiler and engine mounted at the front, driving the front wheels by belts and steering with the rear and they built a second, La Marquise, the next year, with a more conventional steering and rear-wheel drive, capable of seating four. The Marquis de Dion entered one of these in an 1887 trial, Europes first motoring competition, the brainchild of one M. Fossier of cycling magazine Le Vélocipède. Evidently, the promotion was insufficient, for the De Dion was the entrant, but it completed the course, with de Dion at the tiller. This must be taken with care, the first official land speed record. The vehicle survives, in condition, and has been a regular entry in the London to Brighton Veteran Car Run. Following this singular success, the company offered steam tricycles with boilers between the front wheels and two-cylinder engines and they were built in small numbers, evidently a favorite of young playboys. They were later joined by a tractor, able to pull trailers. On July 22,1894, Paris–Rouen race, it averaged 18.7 km/h over the 126 km route, two more cars were made in 1885 followed by a series of lightweight two-cylinder tricars, which from 1892 had Michelin pneumatic tyres. The company manufactured steam buses and trucks until 1904, trepardoux, staunchly supporting steam, resigned in 1894 as the company turned to internal combustion vehicles. The steam car remained in more or less unchanged for ten years more. By 1889, de Dion was becoming convinced the future lay in the combustion engine. After Trépardoux resigned in 1894, the company became De Dion, Bouton et Compagnie, for 1895, Bouton created a new 137 cc one-cylinder engine with trembler coil ignition
6.
Chain drive
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Chain drive is a way of transmitting mechanical power from one place to another. It is often used to power to the wheels of a vehicle. It is also used in a variety of machines besides vehicles. The gear is turned, and this pulls the chain putting mechanical force into the system, another type of drive chain is the Morse chain, invented by the Morse Chain Company of Ithaca, New York, United States. Sometimes the power is output by simply rotating the chain, which can be used to lift or drag objects, in other situations, a second gear is placed and the power is recovered by attaching shafts or hubs to this gear. By varying the diameter of the input and output gears with respect to each other, for example, when the bicycle pedals gear rotate once, it causes the gear that drives the wheels to rotate more than one revolution. The oldest known application of a chain appears in the Polybolos. Two flat-linked chains were connected to a windlass, which by winding back and it is here that the flat-link chain, often attributed to Leonardo da Vinci, actually made its first appearance. The chain drive itself was given power via the works of Sus water clock tank and waterwheel. Roller chain and sprockets is an efficient method of power transmission compared to belts. Although chains can be stronger than belts, their greater mass increases drive train inertia. Drive chains are most often made of metal, while belts are often rubber, plastic, urethane, or other substances. Drive belts can slip unless they have teeth, which means that the side may not rotate at a precise speed. Wear on rubber or plastic belts and their teeth is often easier to observe, one problem with roller chains is the variation in speed, or surging, caused by the acceleration and deceleration of the chain as it goes around the sprocket link by link. It starts as soon as the line of the chain contacts the first tooth of the sprocket. This contact occurs at a point below the circle of the sprocket. As the sprocket rotates, the chain is raised up to the circle and is then dropped down again as sprocket rotation continues. This rising and falling of the line is what causes chordal effect or speed variation
7.
Differential (mechanical device)
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In automobiles and other wheeled vehicles, the differential allows the outer drive wheel to rotate faster than the inner drive wheel during a turn. This is necessary when the vehicle turns, making the wheel that is traveling around the outside of the turning curve roll farther and faster than the other, the average of the rotational speed of the two driving wheels equals the input rotational speed of the drive shaft. An increase in the speed of one wheel is balanced by a decrease in the speed of the other, when used in this way, a differential couples the input shaft to the pinion, which in turn runs on the ring gear of the differential. This also works as reduction gearing, on rear wheel drive vehicles the differential may connect to half-shafts inside an axle housing, or drive shafts that connect to the rear driving wheels. Front wheel drive tend to have the pinion on the end of the main-shaft of the gearbox. There are individual drive-shafts to each wheel, non-automotive uses of differentials include performing analog arithmetic. The ball was painted black and white in hemispheres, and graphically showed the phase of the moon at a point in time. See also the Chinese South-pointing chariot, an equation clock that used a differential for addition was made in 1720. In the 20th Century, large assemblies of many differentials were used as analog computers, calculating, for example, however, the development of electronic digital computers has made these uses of differentials obsolete. Practically all the differentials that are now made are used in automobiles, there are many claims to the invention of the differential gear, but it is possible that it was known, at least in some places, in ancient times. Some historical milestones of the include,100 BC–70 BC. Some such chariots may have used differential gears,658,666 AD, two Chinese Buddhist monks and engineers create south-pointing chariots for Emperor Tenji of Japan. 1720, Joseph Williamson uses a gear in a clock. 1810, Rudolph Ackermann of Germany invents a four-wheel steering system for carriages,1827, modern automotive differential patented by watchmaker Onésiphore Pecqueur of the Conservatoire National des Arts et Métiers in France for use on a steam wagon. 1832, Richard Roberts of England patents gear of compensation, a differential for road locomotives,1874, Aveling and Porter of Rochester, Kent list a crane locomotive in their catalogue fitted with their patent differential gear on the rear axle. 1876, James Starley of Coventry invents chain-drive differential for use on bicycles,1897, first use of differential on an Australian steam car by David Shearer. 1958, Vernon Gleasman patents the Torsen dual-drive differential, a type of differential that relies solely on the action of gearing, instead of a combination of clutches. An epicyclic differential can use epicyclic gearing to split and apportion torque asymmetrically between the front and rear axles, an epicyclic differential is at the heart of the Toyota Prius automotive drive train, where it interconnects the engine, motor-generators, and the drive wheels
8.
Traction engine
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A traction engine is a self-propelled steam engine used to move heavy loads on roads, plough ground or to provide power at a chosen location. The name derives from the Latin tractus, meaning drawn, since the function of any traction engine is to draw a load behind it. They are sometimes called road locomotives to distinguish them from railway locomotives – that is, Traction engines tend to be large, robust and powerful, but heavy, slow, and difficult to manoeuvre. Nevertheless, they revolutionized agriculture and road haulage at a time when the alternative prime mover was the draught horse. They became popular in industrialised countries from around 1850, when the first self-propelled portable steam engines for use were developed. All types of engines have now been superseded, in commercial use. However, several examples have been preserved worldwide, many in working order. Steam fairs are held throughout the year in the United Kingdom, and in other countries, however, where soil conditions permitted, direct hauling of implements was preferred – in America, this led to the divergent development of the steam tractor. Limits of technical knowledge and manufacturing technology meant that practicable road vehicles, powered by steam, the alteration was made by fitting a long driving chain between the crankshaft and the rear axle. The first half of the 1860s was a period of great experimentation but by the end of the decade the standard form of the engine had evolved. Until the quality of roads improved there was demand for faster vehicles and engines were geared accordingly to cope with their use on rough roads. British companies such as Manns and Garrett developed potentially viable direct ploughing engines, however conditions were against them. These market conditions arose in the wake of the First World War when there was a glut of surplus equipment available as a result of British Government policy. Large numbers of Fowler ploughing engines had been constructed in order to increase the land under tillage during the war, road steam disappeared through restrictions and charges that drove up their operating costs. Through 1921, steam tractors had demonstrated clear economic advantages over horse power for heavy hauling, the tax was payable by all road hauliers in proportion to the axle load and was particularly restrictive on steam propulsion, which was heavier than its petrol equivalent. This was at a time of unemployment in the mining industry. The tax was devastating to the businesses of heavy hauliers and showmen, the last new UK-built traction engines were constructed during the 1930s, although many continued in commercial use for many years while there remained experienced enginemen available to drive them. From the 1950s, the movement started to build up as enthusiasts realised that traction engines were in danger of dying out
9.
Aldershot
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Aldershot is a town in the English county of Hampshire, located on heathland about 37 mi southwest of London. The area is administered by Rushmoor Borough Council, the town has a population of 36,321, while the Farnborough/Aldershot Built-up Area, a loose conurbation has a population of 243,344, making it the thirtieth-largest urban area in the UK. Aldershot is known as the Home of the British Army, a connection led to its rapid growth from a small village to a Victorian town. Aldershot is twinned with Sulechów in Poland, Meudon in France, the name may have derived from alder trees found in the area. Aldershot was included as part of the Hundred of Crondall referred to in the Domesday Book of 1086, john Nordens map of Hampshire, published in the 1607 edition of William Camdens Britannia, indicates that Aldershot was a market town. Prior to 1850, Aldershott was little known, the area was a vast stretch of common land, a lonely wasteland unsuitable for most forms of agriculture with scant population. In the 18th century, the stretch of the London to Winchester turnpike that passed through Aldershot between Bagshot and Farnham was the scene of highway robberies, at one time it had almost as bad a reputation as Hounslow Heath. Dick Turpin is said to have operated in the area having his headquarters nearby in Farnborough, in 1854, at the time of the Crimean War, Aldershot Garrison was established as the first permanent training camp for the British Army. This led to an expansion of Aldershots population going from 875 in 1851. Mrs Louisa Daniell arrived in the town at this time and set up her Soldiers Home and Institute to cater for the needs of the soldiers. The Aldershot riot of July 1945 caused considerable damage to the centre when disgruntled Canadian troops rioted in the streets for two evenings. A substantial rebuilding of the barracks was carried out between 1961 and 1969, by the architecture and engineering firm Building Design Partnership, the work was sped up under government pressure, and various new building technologies were employed with mixed success. In 1974 Aldershot and Farnborough urban districts were merged to form the Borough of Rushmoor under the provisions of the Local Government Act 1972. After a 2009 campaign, the British Government allowed veteran Gurkha soldiers who had served for more four years. As many Gurkha soldiers had been based in and around Aldershot, between the 2001 Census and the 2011 Census, Rushmoors Nepalese population increased to approximately 6,000 people, making up 6. 5% of the overall population. Howarth was later criticised for suggesting that Nepalese migrants should be dispersed across the UK, the Aldershot Military Tattoo was an annual event dating back to 1894. In the 1920s and 30s, the Aldershot Command Searchlight Tattoo held at the Rushmoor Arena presented displays from all branches of the services, at one time the performances attracted crowds of up to 500,000 people. The Tattoo was organised to raise money for military charities, by the end of the 1930s the event was raising around £40,000 annually
10.
Compound steam engine
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A compound steam engine unit is a type of steam engine where steam is expanded in two or more stages. Multiple-expansion engines employ additional cylinders, of lower pressure, to extract further energy from the steam. Invented in 1781, this technique was first employed on a Cornish beam engine in 1804, around 1850, compound engines were first introduced into Lancashire textile mills. In a single-expansion steam engine, the steam enters the cylinder at boiler pressure through an inlet valve. The steam pressure forces the piston down the cylinder, until the valve shuts and this cut-off allows much more work to be extracted, since the expansion of the steam is doing additional work beyond that done by the steam at boiler pressure. An earlier cut-off increases the ratio, which in principle allows more energy to be extracted and increases efficiency. This temperature drop would occur if the cylinder were perfectly insulating so that no heat is released from the system. As a result, steam enters the cylinder at high temperature, the changing steam temperature alternately heats and cools the cylinder with every stroke and is a source of inefficiency which increases at higher expansion ratios. Beyond a certain point, further increasing the ratio will actually decrease efficiency due to the increased heating and cooling. A method to lessen the magnitude of this heating and cooling was invented in 1804 by British engineer Arthur Woolf, in the compound engine, high-pressure steam from the boiler first expands in a high-pressure cylinder and then enters one or more subsequent lower pressure cylinders. The complete expansion of the steam occurs across multiple cylinders and, as there is less expansion in each cylinder and this reduces the magnitude of cylinder heating and cooling, making higher expansion ratios practical and increasing the efficiency of the engine. There are other advantages, as the range is smaller, cylinder condensation is reduced. Loss due to condensation is restricted to the LP cylinder, pressure difference is less in each cylinder so there is less steam leakage at the piston and valves. The turning moment is uniform, so balancing is easier. Only the smaller HP cylinder needs to be built to withstand the highest pressure, similarly, components are subject to less strain, so they can be lighter. The reciprocating parts of the engine are lighter, reducing the engine vibrations, the compound could be started at any point in the cycle, and in the event of mechanical failure the compound could be reset to act as a simple, and thus keep running. To derive equal work from lower-pressure steam requires a larger cylinder volume as this steam occupies a greater volume, therefore, the bore, and often the stroke, are increased in low-pressure cylinders, resulting in larger cylinders. Double-expansion engines expand the steam in two stages, but this does not imply that all engines have two cylinders
11.
Glossary of boiler terms
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Boilers for generating steam or hot water have been designed in countless shapes, sizes and configurations. An extensive terminology has evolved to describe their common features and this glossary provides definitions for these terms. Terms which relate solely to boilers used for heating or generating hot water are identified by. Ashpan A container beneath the furnace, catching ash and clinker that falls through the firebars and this may be made of brickwork for a stationary boiler, or steel sheet for a locomotive. Ashpans are often the location of the damper and they may also be shaped into hoppers, for easy cleaning during disposal. Blastpipe Blow-down Periodic venting of water from the boiler and this water contains the most concentrated precursors for sludge build-up, so by venting it whilst still dissolved, the build-up is reduced. When early marine boilers were fed with water, they would be blown-down several times an hour. Blow-down cock a valve mounted low-down on the boiler, often around the foundation ring, blower the blower provides a forced draught on the fire, encouraging combustion. It consists of a ring mounted either in the base of the chimney or on top of the blastpipe. Holes are drilled in the top of the ring, and when steam is fed into the ring. Boiler A pressure vessel for the creation of hot water or steam, boilersmith a craftsman skilled in the techniques required for the construction and repair of boilers - not to be confused with at boilermaker. A boilermaker is a metalworker, usually the member of a union of the same name. A boilermaker may or may not be a boilersmith, a boilersmith may also be a member of another trade such as a plumber or pipeworker and so may not be a boilermaker. Boiler suit heavy-duty one-piece protective clothing, worn when inspecting the inside of a firebox for steam leaks, for which task it is necessary to crawl through the firehole door. Boiler ticket the safety certificate issued for a boiler on passing a formal inspection after a major rebuild. Additional annual safety inspections must also be undertaken, which may result in the locomotive being withdrawn from service if the boiler requires work, when the ticket expires the locomotive cannot be used until the boiler has been overhauled or replaced, and a new ticket obtained. Boiler water treatment Removal or chemical modification of boiler feedwater impurities to avoid scale, corrosion, brick arch A horizontal baffle of firebrick within the furnace, usually of a locomotive boiler. This forces combustion gases from the front of the furnace to flow further, back over the rest of the furnace, encouraging efficient combustion
12.
Coke (fuel)
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Coke is a fuel with few impurities and a high carbon content, usually made from coal. It is the carbonaceous material derived from destructive distillation of low-ash. Cokes made from coal are grey, hard, and porous, while coke can be formed naturally, the commonly used form is man-made. The form known as coke, or pet coke, is derived from oil refinery coker units or other cracking processes. Coke is used in preparation of producer gas which is a mixture of carbon monoxide, producer gas is produced by passing air over red-hot coke. Coke is also used to water gas. Historical sources dating to the 4th century describe the production of coke in ancient China, the Chinese first used coke for heating and cooking no later than the ninth century. By the first decades of the century, Chinese ironworkers in the Yellow River valley began to fuel their furnaces with coke. In 1589 a patent was granted to Thomas Proctor and William Peterson for making iron and steel and melting lead with earth-coal, sea-coal, turf, the patent contains a distinct allusion to the preparation of coal by cooking. In 1590 a patent was granted to the Dean of York to purify pit-coal, in 1620 a patent was granted to a company composed of William St. John, Robert Follensbee and other knights, mentioning the use of coke in smelting ores and manufacturing metals. In 1627 a patent was granted to Sir John Hacket and Octavius de Strada for a method of rendering sea-coal and pit-coal as useful as charcoal for burning in houses, without offense by smell or smoke. In 1603 Hugh Plat suggested that coal might be charred in an analogous to the way charcoal is produced from wood. In 1709 Abraham Darby I established a coke-fired blast furnace to produce cast iron, cokes superior crushing strength allowed blast furnaces to become taller and larger. The ensuing availability of iron was one of the factors leading to the Industrial Revolution. Before this time, iron-making used large quantities of charcoal, produced by burning wood, in the late 18th century, brick beehive ovens were developed, which allowed more control over the burning process. In 1768 John Wilkinson built a more practical oven for converting coal into coke, with greater skill in the firing, covering and quenching of the heaps, yields were increased from about 33 per cent to 65 per cent by the middle of the 19th century. The Scottish iron industry expanded rapidly in the second quarter of the 19th century. In 1802 a battery of beehives was set up near Sheffield, by 1870, there were 14,000 beehive ovens in operation on the West Durham coalfields, capable of producing 4.2 million tons of coke
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