A windmill is a structure that converts wind power into rotational energy using vanes called sails or blades, by tradition specifically to mill grain ( gristmills ), but in some parts of the English-speaking world, the term has also been extended to encompass windpumps , wind turbines , and other applications. The term wind engine is also sometimes used to describe such devices.
120-528: Windmills were used throughout the high medieval and early modern periods ; the horizontal or panemone windmill first appeared in Persia during the 9th century, and the vertical windmill first appeared in northwestern Europe in the 12th century. Regarded as an icon of Dutch culture , there are approximately 1,000 windmills in the Netherlands today. Wind-powered machines may have been known earlier, but there
240-457: A century there were more inventions developed and applied usefully than in the previous thousand years of human history all over the globe. The period saw major technological advances, including the adoption or invention of windmills , watermills , printing (though not yet with movable type), gunpowder , the astrolabe , glasses , scissors of the modern shape, a better clock , and greatly improved ships. The latter two advances made possible
360-414: A comprehensive production of alcohol. Food production also increased during this time as new ways of farming were introduced, including the use of a heavier plow, horses instead of oxen, and a three-field system that allowed the cultivation of a greater variety of crops than the earlier two-field system—notably legumes , the growth of which prevented the depletion of important nitrogen from the soil. During
480-533: A divine spark. Other notable scholastics included Muhammad Averroes , Roscelin , Abélard, Peter Lombard , and Francisco Suárez . One of the main questions during this time was the problem of universals . Prominent opponents of various aspects of the scholastic mainstream included Duns Scotus , William of Ockham , Peter Damian , Bernard of Clairvaux , and the Victorines . Christian heresies existed in Europe before
600-438: A high demand for wine and steady volume of alcohol consumption inspired a viticulture revolution of progress. The relative protection from famine during this time allowed Europe's population to increase, despite the famine in 1315 that killed 1.5 million people. This increased population contributed to the founding of new towns and an increase in industrial and economic activity during the period. They also established trade and
720-481: A hollow-post mill, the post on which the body is mounted is hollowed out, to accommodate the drive shaft. This makes it possible to drive machinery below or outside the body while still being able to rotate the body into the wind. Hollow-post mills driving scoop wheels were used in the Netherlands to drain wetlands since the early 15th century onwards. By the end of the 13th century, the masonry tower mill, on which only
840-664: A huge waste problem in Denmark and countries Denmark, to a greater and greater extent, export its many produced wind turbines. " The reason why many wings end up in landfill is that they are incredibly difficult to separate from each other, which you will have to do if you hope to be able to recycle the fiberglass ", says Lykke Margot Ricard, Associate Professor in Innovation and Technological Foresight and education leader for civil engineering in Product Development and Innovation at
960-522: A key role in European trade from then on, making these cities become major financial centers. From the mid-10th to the mid-11th centuries, the Scandinavian kingdoms were unified and Christianized, resulting in an end of Viking raids, and greater involvement in European politics. King Cnut of Denmark ruled over both England and Norway. After Cnut's death in 1035, England and Norway were both lost, and with
1080-522: A landfill at Gerringe in the middle of Lolland in 2020. In the United States , worn-out wind turbine blades made of fiberglass go to the handful of landfills that accept them (e.g., in Lake Mills , Iowa; Sioux Falls , South Dakota; Casper ). Windpumps were used to pump water since at least the 9th century in what is now Afghanistan , Iran , and Pakistan . The use of windpumps became widespread across
1200-607: A religious experience and became a preacher. He founded the Waldensians which became a Christian sect believing that all religious practices should have strictly scriptural bases. Waldo was denied the right to preach his sermons by the Third Lateran Council in 1179, which he did not obey and continued to speak freely until he was excommunicated in 1184. Waldo was critical of the Christian clergy saying they did not live according to
1320-462: A result of the First Crusade . In the context of the crusades, monastic military orders were founded that would become the template for the late medieval chivalric orders . The Knights Templar were a Christian military order founded after the First Crusade to help protect Christian pilgrims from hostile locals and highway bandits. The order was deeply involved in banking, and in 1307 Philip
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#17328386478951440-565: A series of low hills and steep valleys that are in the main underlain by calcareous ( chalk and limestone ) and sandstone rock laid down in the Cretaceous and Jurassic periods. One exception to this is the North Leicestershire / South Nottinghamshire Wolds, which are underlain by sometimes chalky glacial till ('Oadby Till'). The characteristic open valleys of the Wolds were created during
1560-651: A single family. During the High Middle Ages Lithuania emerged as a Duchy of Lithuania in the early 13th century, then briefly becoming the Kingdom of Lithuania from 1251 to 1263. After the assassination of its first Christian king Mindaugas Lithuania was known as Grand Duchy of Lithuania . Unconquered during the Lithuanian Crusade , Lithuania itself rapidly expanded to the East due to conquests and became one of
1680-406: A small turbine in the back that helped the main mill to face the direction of the wind. Common sails consist of a lattice framework on which the sailcloth is spread. The miller can adjust the amount of cloth spread according to the wind and the power needed. In medieval mills, the sailcloth was wound in and out of a ladder-type arrangement of sails. Later mill sails had a lattice framework over which
1800-656: A successful Vlach-Bulgarian rebellion in 1185 , and henceforth the region was divided between the Byzantines in Greece, some parts of Macedonia , and Thrace , the Bulgarians in Moesia and most of Thrace and Macedonia, and the Serbs to the northwest. Eastern and Western churches had formally split in the 11th century, and despite occasional periods of co-operation during the 12th century, in 1204
1920-506: Is a windmill-like structure specifically developed to generate electricity. They can be seen as the next step in the development of the windmill. The first wind turbines were built by the end of the nineteenth century by James Blyth in Scotland (1887), Charles F. Brush in Cleveland, Ohio (1887–1888) and Poul la Cour in Denmark (1890s). La Cour's mill from 1896 later became the local power of
2040-455: Is ambiguity in the text and issues with the design. Another early example of a wind-driven wheel was the prayer wheel , which is believed to have been first used in Tibet and China , though there is uncertainty over the date of its first appearance, which could have been either c. 400 , the 7th century, or after the 9th century. One of the earliest recorded working windmill designs found
2160-522: Is hardly exact, for the centre was at Toulouse and in the neighbouring districts. The Albigensians were strong in southern France, northern Italy, and the southwestern Holy Roman Empire . The Bogomils were strong in the Southeastern Europe , and became the official religion supported by the Bosnian kings . Peter Waldo of Lyon was a wealthy merchant who gave up his riches around 1175 after
2280-401: Is no clear evidence of windmills before the 9th century. Hero of Alexandria (Heron) in first-century Roman Egypt described what appears to be a wind-driven wheel to power a machine. His description of a wind-powered organ is not a practical windmill but was either an early wind-powered toy or a design concept for a wind-powered machine that may or may not have been a working device, as there
2400-404: Is that the earliest type of European windmill was the post mill, so named because of the large upright post on which the mill's main structure (the "body" or "buck") is balanced. By mounting the body this way, the mill can rotate to face the wind direction; an essential requirement for windmills to operate economically in north-western Europe, where wind directions are variable. The body contains all
2520-594: The Black Death , but also numerous wars as well as economic stagnation. From around 780, Europe saw the last of the barbarian invasions and became more socially and politically organized. The Carolingian Renaissance stimulated scientific and philosophical activity in Northern Europe. The first universities started operating in Bologna , Oxford , Paris , Salamanca , Cambridge and Modena . The Vikings settled in
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#17328386478952640-841: The Cape Colony in the seventeenth century. The early tower mills did not survive the gales of the Cape Peninsula , so in 1717 the Heeren XVII sent carpenters, masons, and materials to construct a durable mill. The mill, completed in 1718, became known as the Oude Molen and was located between Pinelands Station and the Black River. Long since demolished, its name lives on as that of a Technical school in Pinelands . By 1863, Cape Town had 11 mills stretching from Paarden Eiland to Mowbray . A wind turbine
2760-544: The Carolingian Empire had been divided and replaced by separate successor kingdoms called France and Germany, although not with their modern boundaries. Germany was significantly more eastern. Germany was under the banner of the Holy Roman Empire , which reached its high-water mark of unity and political power under Kaiser Frederick Barbarossa . During the successful reign of King David IV of Georgia (1089–1125),
2880-685: The Crusader States in the Levant . Other wars led to the Northern Crusades . The Christian kingdoms took much of the Iberian Peninsula from Muslim control, and the Normans conquered southern Italy, all part of the major population increases and the resettlement patterns of the era. The High Middle Ages produced many different forms of intellectual, spiritual and artistic works . The age also saw
3000-720: The Early Middle Ages was based upon few copies and commentaries of ancient Greek texts that remained in Western Europe after the collapse of the Western Roman Empire . Most of them were studied only in Latin as knowledge of Greek was very limited. This scenario changed during the Renaissance of the 12th century . The intellectual revitalization of Europe started with the birth of medieval universities . The increased contact with
3120-765: The Enercon E-126 capable of delivering up to 7 MW, while wind turbine production has expanded to many countries. As the 21st century began, rising concerns over energy security , global warming , and eventual fossil fuel depletion led to an expansion of interest in all available forms of renewable energy . Worldwide, many thousands of wind turbines are now operating, with a total nameplate capacity of 591 GW as of 2018. In an attempt to make wind turbines more efficient and increase their energy output, they are being built bigger, with taller towers and longer blades, and being increasingly deployed in offshore locations. While such changes increase their power output, they subject
3240-664: The Fourth Crusade treacherously captured Constantinople . This severely damaged the Byzantines, and their power was ultimately weakened by the Seljuks and the rising Ottoman Empire in the 14–15th century. The power of the Latin Empire , however, was short-lived after the Crusader army was routed by Bulgarian Emperor Kaloyan in the Battle of Adrianople (1205) . The Medieval Warm Period ,
3360-593: The Hanseatic League , a federation of free cities to advance trade by sea, was founded in the 12th century, with the foundation of the city of Lübeck , which would later dominate the League, in 1158–1159. Many northern cities of the Holy Roman Empire became Hanseatic cities, including Amsterdam , Cologne , Bremen , Hanover and Berlin. Hanseatic cities outside the Holy Roman Empire were, for instance, Bruges and
3480-553: The Humber is known as the Humber Gap . The name Wold is derived from the Old English wald meaning "forest", (cognate of German Wald , but unrelated to English "wood", which has a different origin). Wold is an Anglian form of the word, as in other parts of England, different variations can be found. Over the years the meaning changed from "forest" to "high forest land". When
3600-563: The Jurchen Jin dynasty in the north), introduced by the travels of Yelü Chucai to Turkestan in 1219. Vertical-axle windmills were built, in small numbers, in Europe during the 18th and nineteenth centuries, for example Fowler's Mill at Battersea in London, and Hooper's Mill at Margate in Kent . These early modern examples seem not to have been directly influenced by the vertical-axle windmills of
3720-647: The Kingdom of Georgia grew in strength and expelled the Seljuk Empire from its lands. David's decisive victory in the Battle of Didgori (1121) against the Seljuk Turks, as a result of which Georgia recaptured its lost capital Tbilisi , marked the beginning of the Georgian Golden Age . David's granddaughter Queen Tamar continued the upward rise, successfully neutralizing internal opposition and embarking on an energetic foreign policy aided by further decline of
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3840-558: The Macedonian and Komnenos dynasties gradually gave way to the resurrected Serbia and Bulgaria and to a successor crusader state (1204 to 1261), who continually fought each other until the end of the Latin Empire. The Byzantine Empire was reestablished in 1261 with the recapture of Constantinople from the Latins, though it was no longer a major power and would continue to falter through
3960-622: The Matter of France (stories about Charlemagne and his court), the Acritic songs dealing with the chivalry of Byzantium's frontiersmen, and perhaps the best known cycle, the Matter of Britain , which featured tales about King Arthur , his court, and related stories from Brittany , Cornwall , Wales and Ireland. An anonymous German poet tried to bring the Germanic myths from the Migration Period to
4080-500: The Muslim world and later spread to East Asia ( China ) and South Asia ( India ). Windmills were later used extensively in Europe, particularly in the Netherlands and the East Anglia area of Great Britain , from the late Middle Ages onwards, to drain land for agricultural or building purposes. The "American windmill", or "wind engine", was invented by Daniel Halladay in 1854 and
4200-452: The Romanesque style by combining flying buttresses , gothic (or pointed) arches and ribbed vaults . It was influenced by the spiritual background of the time, being religious in essence: thin horizontal lines and grates made the building strive towards the sky. Architecture was made to appear light and weightless, as opposed to the dark and bulky forms of the previous Romanesque style . It
4320-596: The Silk Road to China. Westerners became more aware of the Far East when Polo documented his travels in Il Milione . He was followed by numerous Christian missionaries to the East, such as William of Rubruck , Giovanni da Pian del Carpine , André de Longjumeau , Odoric of Pordenone , Giovanni de' Marignolli , Giovanni di Monte Corvino , and other travellers such as Niccolò de' Conti . Philosophical and scientific teaching of
4440-603: The University of Southern Denmark (SDU). According to Dakofa, the Danish Competence Center for Waste and Resources, there is nothing specific in the Danish waste order about how to handle discarded fiberglass. Several scrap dealers tell Ingeniøren that they have handled wind turbine blades (wings) that have been pulverized after being taken to a recycling station. One of them is the recycling company H.J. Hansen, where
4560-516: The intensive agriculture -prevalent model in Muslim-ruled lands did not require territorial expansion. While Muslim lands enjoyed a certain demographic and financial edge , Almoravids and Almohads from northern Africa featured volatile state structures; barring (unsuccessful) attempts to take Toledo, they did not stand out for carrying out an expansionist policy. In Italy, with the Norman conquest,
4680-468: The product manager informed, that they have transported approximately half of the wings they have received since 2012 to Reno Nord's landfill in Aalborg. A total of around 1,000 wings have ended up there, he estimates - and today up to 99 percent of the wings the company receives end up in a landfill. Since 1996, according to an estimate made by Lykke Margot Ricard ( SDU ) in 2020, at least 8,810 tonnes of
4800-571: The wind turbine design technologies in use today, including steel tube towers, variable-speed generators, composite blade materials, and partial-span pitch control, as well as aerodynamic, structural, and acoustic engineering design capabilities. The modern wind power industry began in 1979 with the serial production of wind turbines by Danish manufacturers Kuriant, Vestas , Nordtank , and Bonus . These early turbines were small by today's standards, with capacities of 20–30 kW each. Since then, commercial turbines have increased greatly in size, with
4920-530: The 11th century but only in small numbers and of local character: in most cases, a rogue priest, or a village returning to pagan traditions. However, beginning in the 11th century, mass-movement heresies appeared. The roots of this can be partially sought in the rise of urban cities, free merchants, and a new money-based economy. The rural values of monasticism held little appeal to urban people who began to form sects more in tune with urban culture. The first large-scale heretical movements in Western Europe originated in
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5040-516: The 12th century, the Cluny monks promoted ethical warfare and inspired the formation of orders of chivalry , such as the Templar Knights . Inherited titles of nobility were established during this period. In 13th-century Germany, knighthood became another inheritable title, although one of the less prestigious, and the trend spread to other countries. The East–West Schism of 1054 formally separated
5160-529: The 13th century had a great impact on the east of Europe , as many countries of the region were invaded, pillaged, conquered or vassalized. During the first half of this period ( c. 1025 —1185), Byzantine Empire dominated the Southeast Europe , and under the Komnenian emperors there was a revival of prosperity and urbanization; however, their domination of Southeast Europe was coming to an end with
5280-481: The 14th century, with remnants lasting until the mid 15th century. In the 11th century, populations north of the Alps began a more intensive settlement, targeting "new" lands, some areas of which had reverted to wilderness after the end of the Western Roman Empire . In what historian Charles Higounet called the "great clearances", Europeans cleared and cultivated some of the vast forests and marshes that lay across much of
5400-683: The 9th century. Such windmills were in widespread use across the Middle East and Central Asia and later spread to Europe, China, and India from there. By the 11th century, the vertical-axle windmill had reached parts of Southern Europe, including the Iberian Peninsula (via Al-Andalus ) and the Aegean Sea (in the Balkans ). A similar type of horizontal windmill with rectangular blades, used for irrigation, can also be found in thirteenth-century China (during
5520-473: The British Isles, France and elsewhere, and Norse Christian kingdoms started developing in their Scandinavian homelands. The Magyars ceased their expansion in the 10th century, and by the year 1000, a Christian Kingdom of Hungary had become a recognized state in Central Europe that was forming alliances with regional powers. With the brief exception of the Mongol invasions in the 13th century, major nomadic incursions ceased. The powerful Byzantine Empire of
5640-432: The Christian church into two parts: Roman Catholicism in Western Europe and Eastern Orthodoxy in the east. It occurred when Pope Leo IX and Patriarch Michael I excommunicated each other, mainly over disagreement over the filioque , an addition to the creed concerning the origin of the Holy Spirit, as well as disputes as to the existence of papal authority over the four Eastern patriarchs , use of unleavened bread in
5760-424: The Dutch in the 17th century to overcome the limitations of tower windmills, which were expensive to build and could not be erected on wet surfaces. The lower half of the smock windmill was made of brick, while the upper half was made of wood, with a sloping tower shape that added structural strength to the design. This made them lightweight and able to be erected on unstable ground. The smock windmill design included
5880-401: The Dutch victims of the 2014 Malaysian Airlines Flight 17 shootdown . Gears inside a windmill convey power from the rotary motion of the sails to a mechanical device. The sails are carried on the horizontal windshaft. Windshafts can be wholly made of wood, wood with a cast iron pole end (where the sails are mounted), or entirely of cast iron. The brake wheel is fitted onto the windshaft between
6000-401: The Fair (Philippine le Bel) had the entire order arrested in France and dismantled on charges of alleged heresy. The Knights Hospitaller were originally a Christian organization founded in Jerusalem in 1080 to provide care for poor, sick, or injured pilgrims to the Holy Land . After Jerusalem was taken in the First Crusade, it became a religious / military order that was charged with
6120-535: The Griffiths Brothers at Toowoomba manufactured windmills of the American pattern from 1876, with the trade name Southern Cross Windmills in use from 1903. These became an icon of the Australian rural sector by utilizing the water of the Great Artesian Basin . Another well-known maker was Metters Ltd. of Adelaide , Perth and Sydney . High Middle Ages Central Europe Guelf , Hohenstaufen , and Ascanian domains in Germany about 1176 The High Middle Ages , or High Medieval Period ,
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#17328386478956240-501: The High Middle Ages, the idea of a Christian warrior started to change as Christianity grew more prominent in Medieval Europe. The Codes of Chivalry promoted the ideal knight to be selfless, faithful, and fierce against those who threaten the weak. Household heavy cavalry ( knights ) became common in the 11th century across Europe, and tournaments were invented. Tournaments allowed knights to establish their family name while being able to gather vast wealth and renown through victories. In
6360-423: The Holy Lands, the order moved to Transylvania in 1211 and later, after being expelled, invaded pagan Prussia with the intention of Christianizing the Baltic region . Yet, both before and after the Order's main pagan opponent, Lithuania , converted to Christianity, the Order had already attacked other Christian nations such as Novgorod and Poland . The Teutonic Knights' power hold, which became considerable,
6480-440: The Islamic world in Spain and Sicily during the Reconquista , and the Byzantine world and Muslim Levant during the Crusades , allowed Europeans access to scientific Arabic and Greek texts, including the works of Aristotle , Alhazen , and Averroes . The European universities aided materially in the translation and propagation of these texts and started a new infrastructure which was needed for scientific communities. At
6600-504: The Mediterranean Sea, tower mills with fixed caps were built because the wind's direction varied little most of the time. The smock mill is a later development of the tower mill, where the masonry tower is replaced by a wooden framework, called the "smock", which is thatched, boarded, or covered by other materials, such as slate , sheet metal , or tar paper . The smock is commonly of octagonal plan, though there are examples with different numbers of sides. Smock windmills were introduced by
6720-456: The Platonist-Augustinian belief that the mind is an immaterial substance. The most famous of the scholastics was Thomas Aquinas (later declared a " Doctor of the Church "), who led the move away from the Platonic and Augustinian and towards Aristotelianism. Aquinas developed a philosophy of mind by writing that the mind was at birth a tabula rasa ("blank slate") that was given the ability to think and recognize forms or ideas through
6840-421: The Polish city of Gdańsk (Danzig), as well as Königsberg, capital of the monastic state of the Teutonic Knights. In Bergen , Norway and Veliky Novgorod , Russia the league had factories and middlemen. In this period the Germans started colonising Europe beyond the Empire, into Prussia and Silesia . In the late 13th century, a Venetian explorer named Marco Polo became one of the first Europeans to travel
6960-463: The Pope so as not to be confused with actual heretical movements such as the Waldensians . Catharism was a movement with Gnostic elements that originated around the middle of the 10th century, branded by the contemporary Roman Catholic Church as heretical . It existed throughout much of Western Europe , but its origination was in Languedoc and surrounding areas in southern France. The name Cathar stems from Greek katharos , "pure". One of
7080-449: The United States, Canada, Southern Africa, and Australia. They feature a large number of blades, so they turn slowly with considerable torque in low winds and are self-regulating in high winds. A tower-top gearbox and crankshaft convert the rotary motion into reciprocating strokes carried downward through a rod to the pump cylinder below. Such mills pumped water and powered feed mills, sawmills, and agricultural machinery. In Australia,
7200-409: The WIME-3D in service in Balaklava , USSR , from 1931 until 1942, a 100 kW generator on a 30-metre (98 ft) tower, the Smith–Putnam wind turbine built in 1941 on the mountain known as Grandpa's Knob in Castleton, Vermont , United States, of 1.25 MW, and the NASA wind turbines developed from 1974 through the mid-1980s. The development of these 13 experimental wind turbines pioneered many of
7320-424: The advantage of being able to run with a damaged sail by removing both the damaged sail and the one opposite, which does not unbalance the mill. In the Netherlands, the stationary position of the sails, i.e. when the mill is not working, has long been used to give signals. If the blades are stopped in a "+" sign (3-6-9-12 o'clock), the windmill is open for business. When the blades are stopped in an "X" configuration,
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#17328386478957440-449: The beginning of the 13th century there were reasonably accurate Latin translations of the main works of almost all the intellectually crucial ancient authors, allowing a sound transfer of scientific ideas via both the universities and the monasteries. By then, the natural science contained in these texts began to be extended by notable scholastics such as Robert Grosseteste , Roger Bacon , Albertus Magnus and Duns Scotus . Precursors of
7560-440: The blade, and together, the system of the webs and spars resist the flapwise loading. Flapwise loading, one of the two different types of loading that blades are subject to, is caused by the wind pressure, and edgewise loading (the second type of loading) is caused by the gravitational force and torque load. The former loading subjects the spar laminate on the pressure (upwind) side of the blade to cyclic tension-tension loading, while
7680-420: The borderlands in the southern meseta . Agricultural models in areas with Mediterranean climate were generally based on biennial crop rotation . Despite population growth, agricultural output remained relatively rigid throughout the period; between the 10th and 13th centuries, migration southwards to exposed areas was incentivized by the possibility of enjoying privileges and acquiring properties. Conversely,
7800-500: The cap is rotated rather than the whole body of the mill, had been introduced. The spread of tower mills came with a growing economy that called for larger and more stable sources of power, though they were more expensive to build. In contrast to the post mill, only the cap of the tower mill needs to be turned into the wind, so the main structure can be made much taller, allowing the sails to be made longer, which enables them to provide useful work even in low winds. The cap can be turned into
7920-408: The care and defence of the Crusader states . After the Holy Lands were eventually taken by Muslim forces, it moved its operations to Rhodes , and later Malta . The Teutonic Knights were a German religious order formed in 1190, in the city of Acre , to aid Christian pilgrims on their way to the Holy Lands and to operate hospitals for the sick and injured in Outremer . After Muslim forces captured
8040-407: The components must be chosen appropriately. The blade of a wind turbine consists of 4 main elements: the root, spar, aerodynamic fairing, and surfacing. The fairing is composed of two shells (one on the pressure side, and one on the suction side), connected by one or more webs linking the upper and lower shells. The webs connect to the spar laminates, which are enclosed within the skins (surfacing) of
8160-401: The components of the windmills to stronger forces and consequently put them at a greater risk of failure. Taller towers and longer blades suffer from higher fatigue, and offshore windfarms are subject to greater forces due to higher wind speeds and accelerated corrosion due to the proximity to seawater. To ensure a long enough lifetime to make the return on the investment viable, the materials for
8280-418: The continent. At the same time, settlers moved beyond the traditional boundaries of the Frankish Empire to new frontiers beyond the Elbe River , which tripled the size of Germany in the process. The Catholic Church , which reached the peak of its political power around then, called armies from across Europe to a series of Crusades against the Seljuk Turks . The crusaders occupied the Holy Land and founded
8400-402: The dawn of the Age of Discovery . These inventions were influenced by foreign culture and society. Alfred W. Crosby described some of this technological revolution in The Measure of Reality: Quantification in Western Europe, 1250-1600 and other major historians of technology have also noted it. Art in the High Middle Ages includes these important movements: Gothic architecture superseded
8520-448: The defeat of Valdemar II in 1227, Danish predominance in the region came to an end. Meanwhile, Norway extended its Atlantic possessions, ranging from Greenland to the Isle of Man , while Sweden, under Birger Jarl , built up a power-base in the Baltic Sea . However, the Norwegian influence started to decline already in the same period, marked by the Treaty of Perth of 1266. Also, civil wars raged in Norway between 1130 and 1240. By
8640-620: The development of the airplane led to further improvements in efficiency by German engineer Bilau and several Dutch millwrights. The majority of windmills have four sails. Multiple-sailed mills, with five, six, or eight sails, were built in Great Britain (especially in and around the counties of Lincolnshire and Yorkshire ), Germany, and less commonly elsewhere. Earlier multiple-sailed mills are found in Spain, Portugal, Greece, parts of Romania, Bulgaria, and Russia. A mill with an even number of sails has
8760-455: The drainage mills have been appointed as a backup to the modern pumping stations. The Zaan district has been said to have been the first industrialized region of the world with around 600 operating wind-powered industries by the end of the eighteenth century. Economic fluctuations and the industrial revolution had a much greater impact on these industries than on grain and drainage mills, so only very few are left. Construction of mills spread to
8880-421: The first great and powerful state was formed, the Kingdom of Sicily with hereditary monarchy. Subsequently joined to the Holy Roman Empire, it had its moment of maximum splendor with the emperor Frederick II . In the rest of Italy, independent city states grew affluent on Eastern Mediterranean maritime trade. These were in particular the thalassocracies of Pisa , Amalfi , Genoa and Venice , which played
9000-448: The first recorded uses is Eckbert von Schönau who wrote on heretics from Cologne in 1181: "Hos nostra Germania catharos appellat." ([In] our Germany [one] calls these [people] "Cathars".) The Cathars are also called Albigensians . This name originates from the end of the 12th century, and was used by the chronicler Geoffroy du Breuil of Vigeois in 1181. The name refers to the southern town of Albi (the ancient Albiga). The designation
9120-593: The forests were cleared, the name was retained and applied to upland areas in general. This was particularly true in the Cotswolds , the Lincolnshire Wolds and also the Yorkshire Wolds. "Westward before her rose fold upon fold of the encircling hills, piled rich and golden." Description of the Yorkshire Wolds by Winifred Holtby . "On either side the river lie/Long fields of barley and of rye, That clothe
9240-407: The front and rear bearings. It has the brake around the outside of the rim and teeth in the side of the rim which drives the horizontal gearwheel called wallower on the top end of the vertical upright shaft. In grist mills , the great spur wheel, lower down the upright shaft, drives one or more stone nuts on the shafts driving each millstone . Post mills sometimes have a head and/or tail wheel driving
9360-759: The horizontal windmill from Persia-Middle East to Southern Europe in the preceding century. The earliest certain reference to a windmill in Northern Europe (assumed to have been of the vertical type) dates from 1185, in the former village of Weedley in Yorkshire which was located at the southern tip of the Wold overlooking the Humber Estuary . Several earlier, but less certainly dated, 12th-century European sources referring to windmills have also been found. These earliest mills were used to grind cereals . The evidence at present
9480-651: The hostile Seljuk Turks . Relying on a powerful military élite, Tamar was able to build on the successes of her predecessors to consolidate an empire which dominated vast lands spanning from present-day southern Russia on the Black Sea to the Caspian Sea . Georgia remained a leading regional power until its collapse under the Mongol attacks within two decades after Tamar's death. In the High Middle Ages, Hungary became one of
9600-558: The largest states in Europe. In the mid-10th century Poland emerged as a duchy after Mieszko I , the ruler of the Polans , conquered the surrounding Lechitic tribes in the region. Then in 1025 under the rule of Bolesław I the Brave , Poland became a kingdom. The High Middle Ages saw the height and decline of the Slavic state of Kievan Rus' and emergence of Cumania . Later, the Mongol invasion in
9720-771: The last glacial period through the action of glaciation and meltwater . The chalk that underlies the Chalk Wolds Landscape Character Type extends from the Yorkshire Wolds to the south coast of England in East Sussex and in Dorset . Geologically, the Lincolnshire Wolds is a continuation of the Yorkshire Wolds which runs through the East Riding of Yorkshire ; the point at which the ranges of hill crosses
9840-516: The late 19th century, steel blades and towers replaced wooden construction. At their peak in 1930, an estimated 600,000 units were in use. Firms such as U.S. Wind Engine and Pump Company, Challenge Wind Mill and Feed Mill Company, Appleton Manufacturing Company, Star, Eclipse , Fairbanks-Morse , Dempster Mill Manufacturing Company , and Aermotor became the main suppliers in North and South America. These windpumps are used extensively on farms and ranches in
9960-581: The level of the French and British epics, producing the Nibelungenlied . There was also a quantity of poetry and historical writings which were written during this period, such as Historia Regum Britanniae by Geoffrey of Monmouth . The Wolds The Wolds is a term used in England to describe a range of hills which consists of open country overlying a base of limestone or chalk . The Wolds comprise
10080-652: The liturgy, and fasting days. The Catholic Crusades occurred between the 11th and 13th centuries. They were conducted under papal authority, initially with the intent of reestablishing Christian rule in The Holy Land by taking the area from the Muslim Fatimid Caliphate . The Fatimids had captured Palestine in AD 970, lost it to the Seljuk Turks in 1073 and recaptured it in 1098, just before they lost it again in 1099 as
10200-415: The medieval period, but to have been independent inventions by 18th-century engineers. The horizontal-axis or vertical windmill (so called due to the plane of the movement of its sails) is a development of the 12th century, first used in northwestern Europe, in the triangle of northern France , eastern England and Flanders . It is unclear whether the vertical windmill was influenced by the introduction of
10320-455: The milling machinery. The first post mills were of the sunken type, where the post was buried in an earth mound to support it. Later, a wooden support was developed called the trestle . This was often covered over or surrounded by a roundhouse to protect the trestle from the weather and to provide storage space. This type of windmill was the most common in Europe until the 19th century when more powerful tower and smock mills replaced them. In
10440-466: The modern scientific method can be seen already in Grosseteste's emphasis on mathematics as a way to understand nature, and in the empirical approach admired by Bacon, particularly in his Opus Majus . During the 12th and 13th century in Europe there was a radical change in the rate of new inventions, innovations in the ways of managing traditional means of production, and economic growth. In less than
10560-470: The most famous sacral building of the time: Notre Dame de Paris . A variety of cultures influenced the literature of the High Middle Ages, one of the strongest among them being Christianity. The connection to Christianity was greatest in Latin literature , which influenced the vernacular languages in the literary cycle of the Matter of Rome . Other literary cycles, or interrelated groups of stories, included
10680-497: The most powerful medieval states in Europe. The Christian Kingdom of Hungary was established in 1000 under King Saint Stephen I of Hungary , and ruled by the Árpád dynasty for the following centuries. King Saint Ladislaus completed the work of King Saint Stephen . He consolidated the Hungarian state power and strengthened the influence of Christianity . His charismatic personality, strategic leadership and military talents resulted
10800-628: The much greater figure of merit of CFRP. When the Vindeby Offshore Wind Farm was taken down in Denmark in 2017, 99% of the not- degradable fiberglass from 33 wind turbine blades ended as cut up at the Rærup Controlled Landfill near Aalborg and in 2020, with considerably larger fiberglass quantities, even though it is the least environmentally friendly way of handling waste . Scrapped wind turbine blades are set to become
10920-639: The newly urbanized areas such as southern France and northern Italy and were probably influenced by the Bogomils and other dualist movements . These heresies were on a scale the Catholic Church had never seen before and as such the response was one of elimination for some (such as the Cathars ). Some Catholic monastic leaders, such as Francis of Assisi , the founder of the Franciscans , had to be recognized directly by
11040-436: The nineteenth century. More recently, windmills have been preserved for their historic value, in some cases as static exhibits when the antique machinery is too fragile to be put in motion, and other cases as fully working mills. Of the 10,000 windmills in use in the Netherlands around 1850, about 1,000 are still standing. Most of these are being run by volunteers, though some grist mills are still operating commercially. Many of
11160-526: The period from the 10th century to about the 14th century in Europe, was a relatively warm and gentle interval ended by the generally colder Little Ice Age which would continue until the Middle of the 19th century. Farmers grew wheat well north into Scandinavia, and wine grapes in northern England, although the maximum expansion of vineyards appeared to occur within the Little Ice Age period. During this time,
11280-470: The period to expand Scholasticism , a combination of Judeo-Islamic and Catholic ideologies with the ancient philosophy. For much of this period, Constantinople remained Europe's most populous city, and Byzantine art reached a peak in the 12th century . In architecture, many of the most notable Gothic cathedrals were built or completed around this period. The Crisis of the Late Middle Ages began at
11400-406: The preceding era, and the Renaissance of the 12th century , including the first developments of rural exodus and urbanization . By 1350, the robust population increase had greatly benefited the European economy, which had reached levels that would not be seen again in some areas until the 19th century. That trend faltered during the Late Middle Ages because of a series of calamities , most notably
11520-469: The rise of ethnocentrism , which evolved later into modern national identities in most of Europe, the ascent of the great Italian city-states and the rise and fall of the Islamic civilization of Al-Andalus . The rediscovery of the works of Aristotle , at first indirectly through medieval Jewish and Islamic philosophy , led Maimonides , Ibn Sina , Ibn Rushd , Thomas Aquinas and other thinkers of
11640-512: The rule of independent native princes until the death of Llywelyn ap Gruffydd in 1282. The Exchequer was founded in the 12th century under King Henry I , and the first parliaments were convened. In 1215, after the loss of Normandy , King John signed the Magna Carta into law, limiting the power of English monarchs . A key geo-strategic development in the Iberian Peninsula was the Christian conquest of Toledo in 1085. Dominated by war,
11760-504: The sailcloth was spread, while in colder climates, the cloth was replaced by wooden slats, which were easier to handle in freezing conditions. The jib sail is commonly found in Mediterranean countries and consists of a simple triangle of cloth wound round a spar. In all cases, the mill needs to be stopped to adjust the sails. Inventions in Great Britain in the late eighteenth and nineteenth centuries led to sails that automatically adjust to
11880-444: The saws. Windmills have been used to power many other industrial processes, including papermills , threshing mills, and to process oil seeds, wool, paints, and stone products. In the 14th century, windmills became popular in Europe; the total number of wind-powered mills is estimated to have been around 200,000 at the peak in 1850, which is close to half of the some 500,000 water wheels . Windmills were applied in regions where there
12000-448: The societal structures and relations in the northern Christian kingdoms were subordinated to the demands of omnipresent military conflict. The territorial expansion of the northern Christian kingdoms to the south brought the creation of border societies, where military demands on knights and foot soldiers and the promotion of settlement were prioritized over potential seigneurial income; military orders also played an important role in
12120-532: The start of the 14th century and marked the end of the period. In England, the Norman Conquest of 1066 resulted in a kingdom ruled by a Francophone nobility. The Normans invaded Ireland in 1169 and soon established themselves in most of the country, although their stronghold was the southeast. Likewise, Scotland and Wales were subdued into vassal states at about the same time, though Scotland later asserted its independence and Wales remained largely under
12240-537: The stiffness, strength, and toughness requirements determined by the loading, the blade needs to be lightweight, and the weight of the blade scales with the cube of its radius. To determine which materials fit the criteria described above, a parameter known as the beam merit index is defined: Mb = E^1/2 / rho, where E is Young's modulus and rho is the density. The best blade materials are carbon fiber and glass fiber reinforced polymers ( CFRP and GFRP ). Currently, GFRP materials are chosen for their lower cost, despite
12360-415: The stone nuts directly, instead of the spur gear arrangement. Additional gear wheels drive a sack hoist or other machinery. The machinery differs if the windmill is used for other applications than milling grain. A drainage mill uses another set of gear wheels on the bottom end of the upright shaft to drive a scoop wheel or Archimedes' screw . Sawmills uses a crankshaft to provide a reciprocating motion to
12480-427: The suction (downwind) side of the blade is subject to cyclic compression-compression loading. Edgewise bending subjects the leading edge to a tensile load, and the trailing edge to a compressive load. The remainder of the shell, not supported by the spars or laminated at the leading and trailing edges, is designed as a sandwiched structure, consisting of multiple layers to prevent elastic buckling. In addition to meeting
12600-517: The termination of internal power struggles and foreign military threats. The Kingdom of Hungary expanded to the Adriatic coast and entered a personal union with Croatia in 1102, by establish other vassal states , Hungary became a small empire that extended its control over the Southeast Europe and the Carpathian region. The Hungarian royal Árpád dynasty gave the world the most saints and blessed from
12720-453: The time of the High Middle Ages, the Carolingian Empire had been divided and replaced by separate successor kingdoms called France and Germany, although not with their modern boundaries. France pushed to the west. The Angevin Empire controlled much of France in the 12th century and early 13th century until the French retook much of their previous territory. By the time of the High Middle Ages,
12840-658: The village of Askov. By 1908, there were 72 wind-driven electric generators in Denmark, ranging from 5 to 25 kW. By the 1930s, windmills were widely used to generate electricity on farms in the United States where distribution systems had not yet been installed, built by companies such as Jacobs Wind , Wincharger, Miller Airlite, Universal Aeroelectric, Paris-Dunn, Airline, and Winpower. The Dunlite Corporation produced turbines for similar locations in Australia. Forerunners of modern horizontal-axis utility-scale wind generators were
12960-489: The wind either by winches or gearing inside the cap or from a winch on the tail pole outside the mill. A method of keeping the cap and sails into the wind automatically is by using a fantail , a small windmill mounted at right angles to the sails, at the rear of the windmill. These are also fitted to tail poles of post mills and are common in Great Britain and English-speaking countries of the former British Empire, Denmark, and Germany but rare in other places. Around some parts of
13080-449: The wind speed without the need for the miller to intervene, culminating in patent sails invented by William Cubitt in 1807. In these sails, the cloth is replaced by a mechanism of connected shutters. In France, Pierre-Théophile Berton invented a system consisting of longitudinal wooden slats connected by a mechanism that lets the miller open them while the mill is turning. In the twentieth century, increased knowledge of aerodynamics from
13200-455: The windmill is closed or not functional. A slight tilt of the sails (top blade at 1 o'clock) signals joy, such as the birth of a healthy baby. A tilt of the blades to 11-2-5-8 o'clock signals mourning, or warning. It was used to signal the local region during Nazi operations in World War II, such as searches for Jews. Across the Netherlands, windmills were placed in mourning positions in honor of
13320-517: The wing scrap have been disposed of in Denmark, and the waste problem will grow significantly in the coming years when more and more wind turbines have reached their end of life. According to the SDU lecturer's calculations, the waste sector in Denmark will have to receive 46,400 tonnes of fiberglass from wind turbine blades over the next 20–25 years. As so, at the island , Lolland , in Denmark, 250 tonnes of fiberglass from wind turbine waste also pours up on
13440-707: The word. He rejected the practice of selling indulgences ( simony ), as well as the common saint cult practices of the day. Waldensians are considered a forerunner to the Protestant Reformation , and they melted into Protestantism with the outbreak of the Reformation and became a part of the wider Reformed tradition after the views of John Calvin and his theological successors in Geneva proved very similar to their own theological thought. Waldensian churches still exist, located on several continents. In Northern Europe,
13560-522: Was also expressed by the relatively large size of these buildings. A gothic cathedral therefore not only invited the visitors to elevate themselves spiritually, it was also meant to demonstrate the greatness of God. The floor plan of a gothic cathedral corresponded to the rules of scholasticism: According to Erwin Panofsky 's Gothic Architecture and Scholasticism , the plan was divided into sections and uniform subsections. These characteristics are exhibited by
13680-907: Was broken in 1410, at the Battle of Grunwald , where the Order suffered a devastating defeat against a joint Polish-Lithuanian army. After Grunwald, the Order declined in power until 1809 when it was officially dissolved. There were ten crusades in total. The new Christian method of learning was influenced by Anselm of Canterbury (1033–1109) from the rediscovery of the works of Aristotle , at first indirectly through Medieval Jewish and Muslim Philosophy ( Maimonides , Avicenna , and Averroes ) and then through Aristotle 's own works brought back from Byzantine and Muslim libraries; and those whom he influenced, most notably Albertus Magnus , Bonaventure and Abélard . Many scholastics believed in empiricism and supporting Roman Catholic doctrines through secular study, reason, and logic. They opposed Christian mysticism , and
13800-506: Was commonly thought that light was an expression of God; therefore, architectural techniques were adapted and developed to build churches that reflected this teaching. Colorful glass windows enhanced the spirit of lightness. As color was much rarer at medieval times than today, it can be assumed that these virtuoso works of art had an awe-inspiring impact on the common man from the street. High-rising intricate ribbed, and later fan vaultings demonstrated movement toward heaven. Veneration of God
13920-580: Was invented sometime around 700–900 AD in Persia . This design was the panemone, with vertical lightweight wooden sails attached by horizontal struts to a central vertical shaft. It was first built to pump water and subsequently modified to grind grain as well. The first practical windmills were panemone windmills , using sails that rotated in a horizontal plane, around a vertical axis. Made of six to 12 sails covered in reed matting or cloth material, these windmills were used to grind grain or draw up water. A medieval account reports that windmill technology
14040-462: Was the period of European history that lasted from AD 1000 to 1300. The High Middle Ages were preceded by the Early Middle Ages and followed by the Late Middle Ages , which ended around AD 1500 (by historiographical convention). Key historical trends of the High Middle Ages include the rapidly increasing population of Europe, which brought about great social and political change from
14160-501: Was too little water, where rivers freeze in winter and in flat lands where the flow of the river was too slow to provide the required power. With the coming of the Industrial Revolution , the importance of wind and water as primary industrial energy sources declined, and they were eventually replaced by steam (in steam mills ) and internal combustion engines, although windmills continued to be built in large numbers until late in
14280-505: Was used in Persia and the Middle East during the reign of Rashidun caliph Umar ibn al-Khattab ( r. 634–644 ), based on the caliph's conversation with a Persian builder slave. The authenticity of part of the anecdote involving the caliph Umar is questioned because it was recorded only in the 10th century. The Persian geographer Estakhri reported windmills being operated in Khorasan (Eastern Iran and Western Afghanistan) already in
14400-400: Was used mostly for lifting water from wells. Larger versions were also used for tasks such as sawing wood, chopping hay, and shelling and grinding grain. In early California and some other states, the windmill was part of a self-contained domestic water system which included a hand-dug well and a wooden water tower supporting a redwood tank enclosed by wooden siding known as a tankhouse . During
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