Deil is a village in the Dutch province of Gelderland . It is a part of the municipality of West Betuwe , and lies about 12 km west of Tiel .
129-419: Deil was a separate municipality until 1978, when it became a part of Geldermalsen. On januari 2019 Deil became part of a newly formed municipality, when the former municipalities of Geldermalsen, Neerijnen and Lingewaal joined together to form the municipality of West-Betuwe. In 2019, the village of Deil had 2.097 inhabitants. The built-up area of the village was 0.38 km², and contained 840 residences. There
258-622: A conduit for cultural and scientific exchange between the Islamic and Christian worlds. For much of its history, al-Andalus existed in conflict with Christian kingdoms to the north. After the fall of the Umayyad caliphate, al-Andalus was fragmented into taifa states and principalities, some of which (such as the Taifa of Toledo , the Taifa of Zaragoza , the Taifa of Seville and the Taifa of Badajoz ) reached considerable territorial extent. After
387-649: A decisive victory over King Roderic at the Battle of Guadalete on July 19, 711, Tariq, accompanied by his mawla , governor Musa ibn Nusayr of Ifriqiya , brought most of the Visigothic Kingdom under Muslim rule in a seven-year campaign. They crossed the Pyrenees and occupied Visigothic Septimania in southern France. Most of the Iberian peninsula became part of the expanding Umayyad Empire , under
516-668: A detachment of some 10,000 Arab troops across the straits . The Arab governor of al-Andalus, joined by this force, crushed the Berber rebels in a series of ferocious battles in 742. However, a quarrel immediately erupted between the Syrian commanders and the Andalusi, the so-called "original Arabs" of the earlier contingents. The Syrians defeated them at the hard-fought Battle of Aqua Portora in August 742 but were too few to impose themselves on
645-489: 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
774-554: 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 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
903-687: 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
1032-539: 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
1161-571: A major influence on the intellectual life of medieval Europe. Muslims and non-Muslims often came from abroad to study at the libraries and universities of al-Andalus, and after the reconquest of Toledo, several translation institutions such as the Toledo School of Translators were established for translating books and texts from Arabic into Latin. The most noted figures in this being Gerard of Cremona and Michael Scot , who took these works to Italy. The transmission of ideas significantly affected
1290-533: A powerful and well-established state that had become one of the most powerful in the Mediterranean. Abd al Rahman was succeeded by Muhammad I of Córdoba , who according to legend had to wear women's clothing to sneak into the imperial palace and be crowned, since he was not the heir apparent. His reign marked a decline in the emirate, which was ended by Abd al-Rahman III . His reign was marked by multiple rebellions, which were dealt with poorly and weakened
1419-649: A punitive expedition against Seville that reached all the way to Tarifa at the southern tip of al-Andalus. In 1085, he annexed Toledo , a turning point which galvanized the remaining taifa leaders into seeking outside help. After the fall of Toledo, most of the major taifa rulers agreed to request the intervention of the Almoravids, a Berber empire based in Marrakesh that had conquered much of northwest Africa. The Almoravid leader, Yusuf Ibn Tashfin , led several campaigns into al-Andalus, initially in defense of
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#17327733435881548-407: 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
1677-416: A truce that would have allowed Abd al-Rahman to marry al-Fihri's daughter. After decisively defeating Yūsuf al-Fihri's army, Abd al-Rahman was able to conquer Córdoba, where he proclaimed himself emir in 756. The rest of Iberia was easily conquered, and Abd al-Rahman soon had control of all of Iberia. Abd al Rahman's rule was stable in the years after his conquest – he built major public works, most famously
1806-468: 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 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
1935-479: 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 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
2064-467: Is a restored windmill in the village, De Vlinder . This Gelderland location article is a stub . You can help Misplaced Pages by expanding it . Windmill 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,
2193-519: 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
2322-458: Is al-Zahrawi, who is considered by many to be "probably the greatest physician in the entire history of Western Islam." Around the year 1000 C.E, he wrote a book with a title that roughly translates to The Arrangement of Medical Knowledge for One Who is Not Able to Compile a Book for Himself ( Kitab al-tasrif li-man 'ajiza 'an al-ta'alif )—a comprehensive medical encyclopedia with the goal of summarizing all existing medical knowledge and eliminating
2451-511: Is seen as the golden age of al-Andalus. Córdoba under the Caliphate, with a population of more than half a million, eventually overtook Constantinople as the largest and most prosperous city in Europe. Al-Andalus became a centre for the arts, medicine, science, music, literature and philosophy. The work of its most important philosophers and scientists, such as Abulcasis and Averroes , had
2580-762: The Reconquista , eventually shrinking to the south and finally to the Emirate of Granada . As a political domain, it successively constituted a province of the Umayyad Caliphate , initiated by the Caliph al-Walid I (711–750); the Emirate of Córdoba ( c. 750 –929); the Caliphate of Córdoba (929–1031); the first taifa kingdoms (1009–1110); the Almoravid Empire (1085–1145);
2709-536: The Battle of Río Salado in 1340. After this, they ceased to play a major role. The subsequent internal turmoil within Castile, however, helped Nasrid Granada to enjoy a period of relative external peace and internal prosperity until the end of the 14th century, under the reigns of Yusuf I ( r. 1333–1354 ) and Muhammad V ( r. 1354–1359, 1362–1391 ). Important cultural figures, such as Ibn al-Khatib , Ibn Zamrak , and Ibn Khaldun all served in
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#17327733435882838-589: The Book of Foods ( Kitab al-Aghdhiya )—a manual on foods and regimen which contains guidelines for a healthy life; and the Kitab al-Taysir —a book written to act as a compendium to Ibn Rushd's Colliget . In Kitab al-Taysir he provides one of the earliest clinical descriptions of the scabies mite. Three of the most notable Andalusi astronomers were Ibn Tufail (d. 1185), Ibn Rushd (Averroes; d. 1198), and Nur ad-Din al-Bitruji (Alpetragius; d. 1204). All lived around
2967-588: The Cantabrian highlands, where they carved out a rump state, the Kingdom of Asturias . In the 720s, the al-Andalus governors launched several sa'ifa raids into Aquitaine but were decisively defeated by Duke Odo the Great of Aquitaine at the Battle of Toulouse (721) . However, after crushing Odo's Berber ally Uthman ibn Naissa on the eastern Pyrenees, Abdul Rahman Al Ghafiqi led an expedition north across
3096-878: 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
3225-749: The Catholic Monarchs . The toponym al-Andalus is first attested by inscriptions on coins minted in 716 by the new Muslim government of Iberia. These coins, called dinars , were inscribed in both Latin and Arabic . The etymology of the name al-Andalus has traditionally been derived from the name of the Vandals ( vándalos in Spanish, vândalos in Portuguese). Since the 1980s, several alternative etymologies have challenged this tradition. In 1986, Joaquín Vallvé proposed that al-Andalus
3354-639: The County of Barcelona . During the eleventh century several centres of power existed among the taifas, and the political situation shifted rapidly. Before the rise of the Almoravids from Africa or the Christians from the north, the Abbadid -ruled Taifa of Seville succeeded in conquering a dozen lesser kingdoms, becoming the most powerful and renowned of the taifas, such that it could have laid claim to be
3483-776: 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
3612-658: The Mosque of Córdoba , and helped urbanize the emirate while defending it from invaders, including the quashing of numerous rebellions, and decisively repelling the invasion by Charlemagne (which would later inspire the epic, Chanson de Roland ). By far the most important of these invasions was the attempted reconquest by the Abbasid Caliphate . In 763 Caliph Al-Mansur of the Abbasids installed al-Ala ibn-Mugith as governor of Africa (whose title gave him dominion over
3741-571: 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
3870-720: The Rhône valley, reaching as far north as Burgundy . Charles Martel of the Franks, with the assistance of Liutprand of the Lombards , invaded Burgundy and Provence and expelled the raiders by 739. In 740, a Berber Revolt erupted in the Maghreb (North Africa). To put down the rebellion, the Umayyad Caliph Hisham dispatched a large Arab army, composed of regiments ( Junds ) of Bilad Ash-Sham , to North Africa. But
3999-626: 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
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4128-474: 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
4257-455: The taifa kingdoms. At the Battle of Sagrajas (or Battle of Zallaqa in Arabic), a Muslim army led by the Almoravids soundly defeated Alfonso VI. By 1090, however, Yusuf ibn Tashfin was disillusioned with the disunity of the taifa leaders and he returned on a campaign to conquer al-Andalus instead. Most of the taifas , except for Zaragoza, were annexed by 1094. Valencia, which had come under
4386-862: The taifas were generally too weak to defend themselves against repeated raids and demands for tribute from the Christian states to the north and west, which were known to the Muslims as "the Galician nations", and which had spread from their initial strongholds in Galicia , Asturias , Cantabria , the Basque country, and the Carolingian Marca Hispanica to become the Kingdoms of Navarre , León , Portugal , Castile and Aragon , and
4515-571: 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
4644-550: The 1260s. Only the region of Granada remained unconquered. From the mid 13th to the late 15th century, the only remaining domain of al-Andalus was the Emirate of Granada , the last Muslim stronghold in the Iberian Peninsula. The emirate was established by Muhammad ibn al-Ahmar in 1230 and was ruled by the Nasrid dynasty , the longest reigning dynasty in the history of al-Andalus. Although surrounded by Castilian lands,
4773-403: 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 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
4902-574: The 15th century in terms of population. The most visible legacy of the Nasrids is the Alhambra , their fortified palace complex, partly preserved today. The independent Nasrid kingdom was also a trade hub between the Atlantic and Mediterranean, and was frequented especially by Genoese merchants. The Marinids intervened in the south of the Iberian Peninsula multiple times up until their defeat at
5031-528: 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 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)
5160-639: The Abbasid government in North Africa, and declared themselves a caliphate. Inspired by this action, Abd al Rahman joined the rebellion and declared himself caliph in 929. For nearly 100 years under the Córdoban Umayyad period, from the 9th century to the 10th, al-Andalus also extended its presence from Fraxinetum into the Alps with a series of organized raids. The period of the Caliphate
5289-711: The Arabs. The Berber soldiers accompanying Tariq were garrisoned in the centre and the north of the peninsula, as well as in the Pyrenees, while the Berber colonists who followed settled in all parts of the country – north, east, south and west. Visigothic lords who agreed to recognize Muslim suzerainty were allowed to retain their fiefs (notably, in Murcia, Galicia, and the Ebro valley). Resistant Visigoths took refuge in
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5418-542: The Castilian kings. Along with this political status, its favorable geographic location, with the Sierra Nevada as a natural barrier, helped to prolong Nasrid rule. Granada also accommodated a large number of Muslim refugees fleeing the Reconquista or expelled from Christian-controlled territories, which grew the city and the emirate's population. The city even became one of the largest in Europe throughout
5547-529: The Christian advance captured new cities and fortresses until the last Nasrid ruler, Muhammad XII (known as Boabdil to the Christians), formally surrendered Granada to the Catholic Monarchs on 2 January 1492. By this time Muslims in Castile numbered half a million. After the fall, "100,000 had died or been enslaved, 200,000 emigrated, and 200,000 remained as the residual population. Many of
5676-409: The Christian capture of Toledo in 1085, the Almoravid empire intervened and repelled attacks on the region, then brought al-Andalus under direct Almoravid rule. For the next century and a half, al-Andalus became a province of the Muslim empires of the Almoravids and their successors, the Almohads , both based in Marrakesh . Ultimately, the northern Christian kingdoms overpowered the Muslim states to
5805-425: The Christian kingdoms expanded southward again. From 1146 onward, the Almohads intervened and took control of al-Andalus. One of Abd al-Mu'min's successors, Ya'qub al-Mansur , won a major victory over the Castilian Alfonso VIII at the Battle of Alarcos in 1195. In 1212, a coalition of Christian kings under the leadership of Alfonso VIII defeated the Almohads at the Battle of Las Navas de Tolosa . Almohad rule
5934-424: 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
6063-402: 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
6192-411: 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 . Al-Andalus Al-Andalus ( Arabic : الأَنْدَلُس )
6321-413: The Islamic south. Between this frontier and its heartland in the south, the al-Andalus state had three large march territories ( thughur ): the Lower March (capital initially at Mérida , later Badajoz ), the Middle March (centred at Toledo), and the Upper March (centred at Zaragoza ). These disturbances and disorder also allowed the Franks, now under the leadership of Pepin the Short , to invade
6450-505: 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
6579-453: The Moriscos ). The last mass prosecution against Moriscos for crypto-Islamic practices occurred in Granada in 1727, with most of those convicted receiving relatively light sentences. The Morisco community including these final convicts kept their identity alive at least through the late eighteenth century. There was much scientific activity in Al-Andalus, especially in the fields of medicine , astronomy , mathematics , and agronomy . At
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#17327733435886708-427: The Muslim elite, including Muhammad XII, who had been given the area of the Alpujarras mountains as a principality, found life under Christian rule intolerable and passed over into North Africa." Under the conditions of the Capitulations of 1492, the Muslims in Granada were to be allowed to continue to practice their religion. Mass forced conversions of Muslims in 1499 led to a revolt that spread to Alpujarras and
6837-500: The Nasrid court during this period. In 1468, Isabella , the only child of Henry IV of Castile , married Ferdinand , the son of John II of Aragon , and by 1479 they were rulers of a united Castile and Aragon. This development meant that Granada could no longer exploit divisions between the two kingdoms and the new royal couple, also known as the Catholic Monarchs , were united in their intention to conquer it. The final war to conquer Granada began in earnest in 1482. Year by year,
6966-426: The Qinnasrin jund in Jaén . The Egypt jund was divided between Beja ( Alentejo ) in the west and Tudmir ( Murcia ) in the east. The arrival of the Syrians substantially increased the Arab element in the Iberian peninsula and helped strengthen the Muslim hold on the south. However, at the same time, unwilling to be governed, the Syrian junds carried on an existence of autonomous feudal anarchy, severely destabilizing
7095-483: The Umayyad Caliphs distracted by the challenge of the Abbasids in the east, the western provinces of the Maghreb and al-Andalus spun out of their control. From around 745, the Fihrids , an illustrious local Arab clan descended from Oqba ibn Nafi al-Fihri , seized power in the western provinces and ruled them almost as a private family empire of their own – Abd al-Rahman ibn Habib al-Fihri in Ifriqiya and Yūsuf al-Fihri in al-Andalus. The Fihrids welcomed
7224-478: The Umayyads in Damascus and were slaughtering members of that family, and then he spent four years in exile in North Africa, assessing the political situation in al-Andalus across the Straits of Gibraltar, before he landed at Almuñécar . News of his arrival spread across al-Andalus, and when word reached its governor, Yūsuf al-Fihri , he was not pleased. During this time, Abd al-Rahman and his supporters quickly conquered Málaga and then Seville , finally besieging
7353-416: The Umayyads, the sons and grandsons of caliphs, had a more legitimate claim to rule than the Fihrids themselves. Rebellious-minded local lords, disenchanted with the autocratic rule of the Fihrids, conspired with the arriving Umayyad exiles. In 755, the exiled Umayyad prince Abd al-Rahman I (also called al-Dākhil , the 'Immigrant') arrived on the coast of Spain. He had fled the Abbasids, who had overthrown
7482-449: 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,
7611-411: 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
7740-425: 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,
7869-413: 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 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,
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#17327733435887998-403: The authority of the governor of al-Andalus. A second significant consequence of the revolt was the expansion of the Kingdom of the Asturias , hitherto confined to enclaves in the Cantabrian highlands. After the rebellious Berber garrisons evacuated the northern frontier fortresses, the Christian king Alfonso I of Asturias set about immediately seizing the empty forts for himself, quickly adding
8127-440: 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
8256-426: The bureaucracy's loyalty towards him. Around this time several local Arab lords began to revolt, including one Kurayb ibn Khaldun, who was able to conquer Seville. Some loyalists tried to quell the rebellion, but without proper material support, their efforts were in vain. He declared that the next emir would be his grandson Abd al-Rahman III , ignoring the claims of his four living children. Abdullah died in 912, and
8385-500: 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
8514-451: The capital of al-Andalus, Córdoba . Abd al-Rahman's army was exhausted after their conquest, meanwhile Governor Yūsuf al-Fihri had returned from quashing another rebellion with his army. The siege of Córdoba began, and noticing the starving state of Abd al-Rahman's army, al-Fihri began throwing lavish feasts every day as the siege went on, to tempt Abd al Rahman's supporters to defect to his side. However, Abd al-Rahman persisted, even rejecting
8643-407: 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
8772-401: 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
8901-413: The control of El Cid at the end of its taifa period , was eventually occupied in 1102, after El Cid's death. Zaragoza was annexed in 1110. Modern scholarship has sometimes admitted originality in North African architecture, but according to Yasser Tabbaa, historian of Islamic art and architecture, the Iberocentric viewpoint is anachronistic when considering the political and cultural environment during
9030-552: 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 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
9159-519: 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
9288-456: 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
9417-509: The embalmed head of al-Ala ibn-Mugith, it is said Al Mansur exclaimed "Praise be to God who has put the sea between me and this devil!". Abd al Rahman I died in 788 after a lengthy and prosperous reign. He was succeeded by his son, Hisham I , who secured power by exiling his brother who had tried to rebel against him. Hisham enjoyed a stable reign of eight years and was succeeded by his son Al-Hakam I . The next few decades were relatively uneventful, with only occasional minor rebellions, and saw
9546-594: The emirate was wealthy through being tightly integrated in Mediterranean trade networks and enjoyed a period of considerable cultural and economic prosperity. Despite internal conflicts, the Nasrids of Granada were able to survive in part by playing the Christian kingdoms of the north against each other, while at other times soliciting aid from the Marinids , a new Berber dynasty ruling in North Africa from their capital in Fez . For much of its existence, Granada paid tribute to
9675-411: The emirate, most disastrously following the rebellion of Umar ibn Hafsun . When Muhammad died, he was succeeded by emir Abdullah ibn Muhammad al-Umawi whose power barely reached outside of the city of Córdoba. As Ibn Hafsun ravaged the south, Abdullah did almost nothing, and slowly became more and more isolated, barely speaking to anyone. Abdullah purged his administration of his brothers, which lessened
9804-606: The fall of the Umayyads in the east, in 750, and sought to reach an understanding with the Abbasids , hoping they might be allowed to continue their autonomous existence. But when the Abbasids rejected the offer and demanded submission, the Fihrids declared independence and, probably out of spite, invited the deposed remnants of the Umayyad clan to take refuge in their dominions. It was a fateful decision that they soon regretted, for
9933-568: The following centuries, though certain fields and subjects thrived more depending on the period. Scholars often worked in many different and overlapping subjects, so it is difficult to place those discussed here into a single scientific field each. There were many notable surgeons, physicians, and medical scholars from al-Andalus including Ibn al-Baytar (d. 1248), Abu al-Qasim al-Zahrawi (Albucasis; d. 1013), Muhammad al-Shafrah (d. 1360), Abu Marwan 'Abd al-Malik ibn Habib (d. 853), and Abu Marwan ibn Zuhr (Avenzoar; d. 1162). And of particular note
10062-628: The formation of the European Renaissance . The Caliphate of Córdoba also had extensive trade with other parts of the Mediterranean, including Christian parts. Trade goods included luxury items (silk, ceramics, gold), essential foodstuffs (grain, olive oil, wine), and containers (such as ceramics for storing perishables). In the tenth century, Amalfitans were already trading Fatimid and Byzantine silks in Córdoba. Later references to Amalfitan merchants were sometimes used to emphasize
10191-407: 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
10320-551: The great Umayyad army was crushed by the Berber rebels at the Battle of Bagdoura (in Morocco). Heartened by the victories of their North African brethren, the Berbers of al-Andalus quickly raised their own revolt. Berber garrisons in the north of the Iberian Peninsula mutinied, deposed their Arab commanders, and organized a large rebel army to march against the strongholds of Toledo, Córdoba, and Algeciras. In 741, Balj b. Bishr led
10449-478: The important Book of the Medicine of the Arabs , Ibn Habib also wrote the Book on Stars ( Kirab fi l-nujim ). This book included important "teachings on the lunar mansions, the signs of the zodiac, [and] the division of the seasons." In these teachings, Ibn-Habib calculated the phases of the moon and dates of the annual solstices and equinoxes with relative accuracy. Another important astronomer from al-Andalus
10578-521: 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
10707-490: The medical uses of over 1400 plants and other types of medicine—and ibn Habib's Book of the Medicine of the Arabs ( Kitab tibb al-'arab )—a historical summary of Arabic medicine until the 9th century. Ibn Habib's work is significant because it is one of the oldest known writings in the field of prophetic medicine , which uses hadiths to create Islamic-based medicinal guidelines. His book is also significant because it uses principles of Galenic medicine , such as humorism and
10836-488: The mountains of Ronda ; after this uprising the capitulations were revoked. In 1502 the Catholic Monarchs decreed the forced conversion of all Muslims living under the rule of the Crown of Castile, although in the kingdoms of Aragon and Valencia (both now part of Spain) the open practice of Islam was allowed until 1526. Descendants of the Muslims were subject to expulsions from Spain between 1609 and 1614 (see Expulsion of
10965-657: 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
11094-523: The name of al-Andalus . It was organized as a province subordinate to Ifriqiya , so, for the first few decades, the governors of al-Andalus were appointed by the emir of Kairouan , rather than the Caliph in Damascus . The regional capital was set at Córdoba , and the first influx of Muslim settlers was widely distributed. Following the Muslim conquest of Spain, al-Andalus, then at its greatest extent,
11223-427: The need for students and practitioners to rely on multiple medical texts. The book is renowned for its chapter on surgery which included important illustrations of surgical instruments, as well as sections "on cauterization , on incisions, venesection and wounds, and on bone-setting." For hundreds of years after its publication it was one of the most widely used medical texts for students and medical practitioners and
11352-438: 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
11481-584: The northwestern provinces of Galicia and León to his fledgling kingdom. The Asturians evacuated the Christian populations from the towns and villages of the Galician-Leonese lowlands, creating an empty buffer zone in the Douro River valley (the " Desert of the Duero "). This newly emptied frontier remained roughly in place for the next few centuries as the boundary between the Christian north and
11610-437: The previous golden age of Córdoba. Fatimid Egypt was a supplier of many luxury goods, including elephant tusks, and raw or carved crystals. The Fatimids were traditionally thought to be the only supplier of such goods, and control over these trade routes would be a cause for conflict between the Umayyads and Fatimids. The Caliphate of Córdoba effectively collapsed during a ruinous civil war between 1009 and 1013, although it
11739-525: The province of al-Andalus). He planned to invade and destroy the Emirate of Córdoba, so in response Abd al Rahman fortified himself within the fortress of Carmona with a tenth as many soldiers as al-Ala ibn-Mugith. After a long siege, it appeared that Abd al Rahman would be defeated, but in a last stand Abd al Rahman with his outnumbered forces opened the gates of the fortress and charged at the resting Abbasid army, and decisively defeated them. After being sent
11868-902: The province. The quarrel was settled in 743 when Abū l-Khaṭṭār al-Ḥusām , the new governor of al-Andalus, assigned the Syrians to regimental fiefs across al-Andalus – the Damascus jund was established in Elvira ( Granada ), the Jordan jund in Rayyu ( Málaga and Archidona ), the Jund Filastin in Medina-Sidonia and Jerez , the Emesa (Hims) jund in Seville and Niebla , and
11997-560: The rise of the emirate. In 822 Al Hakam died and was succeeded by Abd al-Rahman II , the first great emir of Córdoba. He rose to power with no opposition and sought to reform the emirate. He quickly reorganized the bureaucracy to be more efficient and built many mosques across the emirate. During his reign science and art flourished, as many scholars fled the Abbasid caliphate due to the disastrous Fourth Fitna . The scholar Abbas ibn Firnas made an attempt to fly, though accounts vary on his success. In 852 Abd al Rahman II died, leaving behind him
12126-511: The rule of the Almoravid dynasty. The rise and fall of the Almoravids is sometimes seen as an expression of Ibn Khaldun 's asabiyyah paradigm. By 1147, the Almoravids were overthrown in North Africa by the Almohads , another Berber dynasty, under the leadership of Abd al-Mu'min . As Almoravid rule collapsed, another brief period of taifa kingdoms followed in al-Andalus, during which
12255-513: 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
12384-466: The same time and focused their astronomical works on critiquing and revising Ptolemaic astronomy and the problem of the equant in his astronomical model. Instead, they accepted Aristotle 's model and promoted the theory of homocentric spheres. Al-Bitruji is believed to have studied under Ibn Tufail and Bitruji's Book on Cosmology ( Kitab fi al-hay'a ) built on Ibn Tufail's work, as well as that of Ibn Rushd, Ibn Bajja, and Maimonides. The book's goal
12513-401: The same time, Andalusi scholars were also highly active in philosophy (see below), especially in the field of logic . The earliest evidence of such activities in al-Andalus dates to the reign of Abd ar-Rahman II ( r. 822–852 ), when developments were spurred by exposure to older works translated from, Greek, Persian and other languages. Scientific studies continued to be pursued in
12642-446: 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
12771-845: The second taifa period (1140–1203); the Almohad Caliphate (1147–1238); the third taifa period (1232–1287); and ultimately the Nasrid Emirate of Granada (1238–1492). Under the Caliphate of Córdoba, the city of Córdoba became one of the leading cultural and economic centres throughout the Mediterranean Basin , Europe, and the Islamic world. Achievements that advanced Islamic and Western science came from al-Andalus, including major advances in trigonometry ( Jabir ibn Aflah ), astronomy ( Al-Zarqali ), surgery ( Al-Zahrawi ), pharmacology ( Ibn Zuhr ), and agronomy ( Ibn Bassal and Abū l-Khayr al-Ishbīlī ). Al-Andalus became
12900-494: The south. In the 13th century, most of the south quickly fell under Christian rule, with Gharb al-Andalus , the Guadalquivir Valley and Eastern al-Andalus [ es ] falling to Portuguese, Castilian, and Aragonese conquests. This left the Emirate of Granada, that was to become a tributary state of the Crown of Castile, as the remaining Muslim state on the Iberian Peninsula, and was surrendered in 1492 to
13029-538: 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
13158-415: 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
13287-488: The strategic strip of Septimania in 752, hoping to deprive al-Andalus of an easy launching pad for raids into Francia . After a lengthy siege, the last Arab stronghold, the citadel of Narbonne , finally fell to the Franks in 759 . Al-Andalus was sealed off at the Pyrenees. The third consequence of the Berber revolt was the collapse of the authority of the Damascus Caliphate over the western provinces. With
13416-428: 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
13545-404: 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
13674-411: 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. 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
13803-445: The theory of four temperaments , as the basis of its medical recommendations. The ibn Zuhr family played a very important role in the production of Andalusi medical knowledge, as they produced five generations of medical experts, particularly in the fields of dietary sciences and medicaments . Abu Marwan ibn Zuhr (d. 1162) is particularly notable, as he wrote the Book of Moderation ( Kitab al-Iqtisad )—a treatise on general therapy;
13932-457: The throne passed to Abd al Rahman III. Through force of arms and diplomacy, he put down the rebellions that had disrupted his grandfather's reign, obliterating Ibn Hafsun and hunting down his sons. After this he led several sieges against the Christians, sacking the city of Pamplona , and restoring some prestige to the emirate. Meanwhile, across the sea the Fatimids had risen up in force, ousted
14061-510: The true heir to the Caliphate of Córdoba. The taifas were vulnerable and divided but had immense wealth. During its prominence the Taifa of Seville produced technically complex lusterware and exerted significant influence on ceramic production across al-Andalus. In the 1080s, the taifa kingdoms began to face an existential threat from the Christian kingdoms to the north, as Alfonso VI of Castile escalated attacks against them. In 1083, he led
14190-582: 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 is that the earliest type of European windmill
14319-717: 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 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
14448-671: 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
14577-565: The western Pyrenees and defeated the Aquitanian duke, who in turn appealed to the Frankish leader Charles Martel for assistance, offering to place himself under Carolingian sovereignty. At the Battle of Poitiers in 732, the al-Andalus raiding army was defeated by Charles Martel and Al Ghafiqi was killed. In 734, the Andalusi launched raids to the east, capturing Avignon and Arles and overran much of Provence . In 737, they traveled up
14706-489: 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
14835-450: 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
14964-461: 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
15093-521: 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
15222-437: Was Maslama al-Majriti (d. 1007), who played a role in translating and writing about Ptolemy's Planisphaerium and Almagest . He built on the work of older astronomers, like Muhammad ibn Musa al-Khwarizmi , whose astronomical tables he wrote a discussion on and subsequently improved. Abu Ishaq Ibrahim al-Zarqali (d. 1087) had many influential astronomical successes, as shown by Copernicus 's recognition of him in his On
15351-461: Was "to overcome the physical difficulties inherent in the geometrical models of Ptolemy 's Almagest and to describe the cosmos in agreement with Aristotelian or Neoplatonic physics," which it succeeded in doing to an extent. Bitruji's book set a precedent of criticizing the Almagest in future works in the field of astronomy. Although Ibn Rushd originally trained and practiced as a jurist, he
15480-489: Was a corruption of the name Atlantis . Heinz Halm in 1989 derived the name from a Gothic term, *landahlauts , and in 2002, Georg Bossong suggested its derivation from a pre-Roman substrate. During the caliphate of the Umayyad Caliph Al-Walid I , the commander Tariq ibn-Ziyad led an army of 7,000 that landed at Gibraltar on April 30, 711, ostensibly to intervene in a Visigothic civil war. After
15609-468: Was diminished in prestige and in 1228 the Almohad caliph al-Ma'mun withdrew from al-Andalus altogether. In this political vacuum, a new wave of taifa kingdoms emerged, which were progressively conquered by Portugal, Castile, and Aragon. Córdoba was conquered in 1236 and Seville was conquered in 1248 . Some Muslim city-states, such as Murcia and Niebla , survived as vassal kingdoms of Castile until
15738-538: Was divided into five administrative units, corresponding roughly to: modern Andalusia ; Castile and León ; Navarre , Aragon , and Catalonia ; Portugal and Galicia ; and the Languedoc-Roussillon area of Occitania . The small army Tariq led in the initial conquest consisted mostly of Berbers, while Musa's largely Arab force of over 12,000 soldiers was accompanied by a group of mawālī (Arabic, موالي), that is, non-Arab Muslims, who were clients of
15867-462: Was exposed to astronomy—possibly through Ibn Tufail—and became a renowned scientist in the field. His most popular work was his Summary of the Almagest , but he also published shorter works discussing Aristotle's planetary theories . Ibn Rushd published writings on philosophy, theology, and medicine throughout his life too, including commentaries on the works of Ibn Sina. In addition to writing
15996-445: Was not finally abolished until 1031 when al-Andalus broke up into a number of mostly independent mini-states and principalities called taifas . In 1013, invading Berbers sacked Córdoba , massacring its inhabitants, pillaging the city, and burning the palace complex to the ground. The largest of the taifas to emerge were Badajoz ( Batalyaws ), Toledo ( Ṭulayṭulah ), Zaragoza ( Saraqusta ), and Granada ( Ġarnāṭah ). After 1031,
16125-423: Was the Muslim -ruled area of the Iberian Peninsula . The name describes the different Muslim states that controlled these territories at various times between 711 and 1492. At its greatest geographical extent, it occupied most of the peninsula as well as Septimania under Umayyad rule. These boundaries changed constantly through a series of conquests Western historiography has traditionally characterized as
16254-409: 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 the milling machinery. The first post mills were of
16383-511: 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
16512-485: Was translated into Hebrew, Latin, and Castilian. This encyclopedia is also significant for its inclusion of al-Zahrawi's personal experiences as a surgeon, which provided important case studies for aspiring surgeons. This distinguishes it from other strictly factual medical works of the time, most notably Ibn Sina's Canon of Medicine . Other important medical texts include al-Baytar's Comprehensive Book on Simple Drugs and Foodstuffs —an encyclopedia with descriptions of
16641-401: 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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