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-{{redirect|Hydraulic|the Transformer|Micromasters}}
-:''For the mechanical technology, see [[hydraulic machinery]] and or the meaning of the phrase [[hydraulic cylinder]]''
-'''Hydraulics''' is a topic in [[applied science]] and [[engineering]] dealing  with the mechanical properties of [[liquid]]s. [[Fluid mechanics]] provides the theoretical foundation for hydraulics, which focuses on the engineering uses of fluid properties. In [[fluid power]], hydraulics is used for the generation, control, and transmission of power by the use of [[pressure|pressurized]] liquids. Hydraulic topics range through most science and engineering disciplines, and cover concepts such as pipe [[flow]], [[dam]] design, [[fluidics]] and fluid control circuitry, [[pump]]s, [[water turbine|turbines]], [[hydropower]], [[computational fluid dynamics]], flow measurement, river channel behavior and erosion.
-'''Free surface hydraulics''' is the branch of hydraulics dealing with [[free surface]] flow, such as occurring in [[river]]s, [[canal]]s, [[lake]]s, [[estuary|estuaries]] and [[sea]]s. Its sub-field '''open channel flow''' studies the flow in open [[channel (geography)|channel]]s.
-The word "hydraulics" originates from the [[Greek language|Greek]] word ''{{Polytonic|ὑδραυλικός}}'' (''hydraulikos'') which in turn originates from ''{{Polytonic|ὕδραυλος}}'' (''hydraulos'') meaning [[water organ]] which in turn comes from ''{{Polytonic|ὕδωρ}}'' (''hydor'', Greek for [[water]]) and ''{{Polytonic|αὐλός}}'' (''aulos'', meaning [[plumbing|pipe]]).
-==Ancient and medieval era==
-===Hellenistic world===
-The earliest masters of hydraulics in the [[Greeks|Greek]]-[[Hellenized]] West were [[Ctesibius]] (flourished c. 270 BC)  and [[Hero of Alexandria]] (c. 10–80 AD). Hero describes a number of working machines using hydraulic power, such as the [[force pump]], which is known from many Roman sites as having been used for raising water and in fire engines, for example.
-===China===
-In [[ancient China]] there was [[Sunshu Ao]] (6th century BC), [[Ximen Bao]] (5th century BC), [[Du Shi]] (circa 31 AD), [[Zhang Heng]] (78 - 139 AD), and [[Ma Jun]] (200 - 265 AD), while medieval China had [[Su Song]] (1020 - 1101 AD) and [[Shen Kuo]] (1031 - 1095). Du Shi employed a [[waterwheel]] to power the [[bellows]] of a [[blast furnace]] producing [[cast iron]]. Zhang Heng was the first to employ hydraulics to provide motive power in rotating an [[armillary sphere]] for [[Chinese astronomy|astronomical observation]].
-===Sri Lanka===
-[[Image:Sigiriya moat and garden2.jpg|thumb|right|250px|Moat and gardens at Sigirya.]]
-In ancient [[Sri Lanka]], the Sri Lankan people used hydraulics in many applications, in the ancient kingdoms of [[Anuradhapura]] and [[Polonnaruwa]]. The discovery of the principle of the [[valve]] tower, or valve pit, for regulating the escape of water is credited to ingenuity more than 2,000 years ago. By the first century A.D, several large-scale irrigation works had been completed. Macro- and micro-hydraulics to provide for domestic horticultural and agricultural needs, surface drainage and erosion control, ornamental and recreational water courses and retaining structures and also cooling systems were in place in [[Sigiriya]], [[Sri Lanka]]. The citadel on the massive rock at the site includes [[cistern]]s for collecting water. Special note is made on the pioneer Hydraulic Engineer, [[Pandukabhaya of Sri Lanka|King Pandukabhaya]] (474-407BC) and [[Parakramabahu|Parākramabāhu the Great]] on the hydraulic history of Sri Lanka.
-===Innovations in Ancient Rome===
-[[Image:Segovia Aqueduct.JPG|thumb|250px|Aqueduct of Segovia]]
-In [[Ancient Rome]] many different hydraulic applications were developed, including public water supplies, innumerable  [[aqueduct]]s, power using [[watermill]]s and [[hydraulic mining]]. They were among the first to make use of the [[siphon]] to carry water across valleys, and used [[hushing]] on a large scale to prospect for and then extract metal [[ore]]s. They used [[lead]] widely in [[plumbing]] systems for domestic and public supply, such as feeding [[thermae]].
-While there is great public awareness of their highly visible aqueducts, less is known about their use of [[hydropower]], although extant remains suggest that it was much more widespread than appreciated. The use of [[hydraulic mining]] methods is at its most spectacular in the gold-fields of northern [[Spain]], which was conquered by [[Augustus]] in 25 BC. The alluvial [[gold-mine]] of [[Las Medulas]] for example must be one of the largest of their mines and even today rivals modern mines in sheer size. It was worked by at least 7 long aqueducts, and the water streams were used to erode the soft deposits, and then wash the tailings for the valuable gold content.
-===Innovations in the Islamic world===
-{{see also|Inventions in the Islamic world|Muslim Agricultural Revolution}}
-[[Image:al-jazari pump.png|thumb|The [[Steam engine#Double-acting engine|double-action]] [[Reciprocating motion|reciprocating]] [[suction]] [[piston]] [[pump]] with a [[valve]] and [[crankshaft]]-[[connecting rod]] mechanism, from a manuscript of [[Al-Jazari]] in 1206.]]
-In the [[Islamic Golden Age|medieval Islamic world]], the advances in in [[fluid mechanics]] by [[Islamic physics|Muslim physicists]] such as [[Abū Rayhān al-Bīrūnī]] (973-1048)<ref name=Rozhanskaya-642>Mariam Rozhanskaya and I. S. Levinova (1996), "Statics", p. 642, in {{Harv|Morelon|Rashed|1996|pp=614-642}}: {{quote|"Using a whole body of mathematical methods (not only those inherited from the antique theory of ratios and infinitesimal techniques, but also the methods of the contemporary algebra and fine calculation techniques), Muslim scientists raised statics to a new, higher level. The classical results of Archimedes in the theory of the centre of gravity were generalized and applied to three-dimensional bodies, the theory of ponderable lever was founded and the 'science of gravity' was created and later further developed in medieval Europe. The phenomena of statics were studied by using the dynamic apporach so that two trends - statics and dynamics - turned out to be inter-related withina single science, mechanics. The combination of the dynamic apporach with Archimedean hydrostatics gave birth to a direction in science which may be called medieval hydrodynamics. [...] Numerous fine experimental methods were developed for determining the specific weight, which were based, in particular, on the theory of balances and weighing. The classical works of al-Biruni and al-Khazini can by right be considered as the beginning of the application of experimental methods in [[medieval science]]."}}</ref> and [[Al-Khazini]] (who invented the [[hydrostatic balance]] in 1121),<ref name=Hall>Robert E. Hall (1973). "Al-Khazini", ''Dictionary of Scientific Biography'', Vol. VII, p. 346.</ref> led to innovations in hydraulics by [[Timeline of Muslim scientists and engineers|Muslim engineers]] and inventors. The [[Muslim Empire]] had advanced [[domestic water system]]s such as [[water]] cleaning systems and advanced [[water transportation]] systems resulting in better [[agriculture]], something that helped in issues related to [[Islamic hygienical jurisprudence]].<ref>''[[Islam: Empire of Faith]]'', Part One, after the 50th minute.</ref>
-Muslim engineers made a number of innovative uses of watermills between the 8th and 13th centuries, including: the [[bridge]] mill, a unique type of mill that was built as part of the [[superstructure]] of a bridge;<ref name=Lucas>Adam Lucas (2006), ''Wind, Water, Work: Ancient and Medieval Milling Technology'', p. 62. BRILL, ISBN 9004146490.</ref> [[gear]]ed [[gristmill]]<ref>[[Donald Routledge Hill]] (1996), "Engineering", p. 781, in {{Harv|Rashed|Morelon|1996|pp=751-95}}</ref> with [[trip hammer]]s;<ref name=Hill2/> [[hydropower]]ed [[forge]] and [[finery forge]];<ref name=Lucas-65>Adam Lucas (2006), ''Wind, Water, Work: Ancient and Medieval Milling Technology'', p. 65. BRILL, ISBN 9004146490.</ref> milling [[dam]], used to provide additional power for milling;<ref name=Hill-Engineering>[[Donald Routledge Hill]] (1996), "Engineering", p. 759, in {{Harv|Rashed|Morelon|1996|pp=751-95}}</ref> [[paper mill]];<ref>[http://www.muslimheritage.com/topics/default.cfm?ArticleID=329 The Beginning of the Paper Industry], Foundation for Science Technology and Civilisation.</ref> shipmill, powered by [[water wheel]]s mounted on the sides of large [[ship]]s [[Mooring (watercraft)|moored]] in [[midstream]];<ref name=Hill2/> spiral [[Scoop (tool)|scoop]]-wheel, a device which raises large quantities of water to ground level with a high degree of efficiency;<ref>[[Donald Routledge Hill]] (1996), "Engineering", p. 774, in {{Harv|Rashed|Morelon|1996|pp=751-95}}</ref> [[sugar refinery]];<ref name=Lucas-10>Adam Robert Lucas (2005), "Industrial Milling in the Ancient and Medieval Worlds: A Survey of the Evidence for an Industrial Revolution in Medieval Europe", ''Technology and Culture'' '''46''' (1): 1-30 [10]</ref> the situation of watermills in the underground [[irrigation]] tunnels of a [[qanat]] and on the main [[canal]]s of valley-floor irrigation systems;<ref name=Lucas-65/> and the [[water turbine]].<ref name=Hill2/> The first [[factory]] milling installations were also built by Muslim engineers throughout every city and urban community in the Islamic world. For example, the factory milling complex in 10th century [[Baghdad]] could produce 10 tonnes of [[flour]] every day.<ref name=Hill-783>[[Donald Routledge Hill]] (1996), "Engineering", p. 783, in {{Harv|Rashed|Morelon|1996|pp=751-95}}</ref>
-In the 9th century, the [[Banū Mūsā]] brothers introduced the use of [[Pressure sensor|differential pressures]] in their hydraulic devices.<ref>{{citation|title=[[Ancient Discoveries]], Episode 12: Machines of the East|publisher=[[History Channel]]|url=http://www.youtube.com/watch?v=n6gdknoXww8|accessdate=2008-09-06}}</ref> They also invented "the earliest known mechanical [[musical instrument]]", in this case a hydropowered [[Organ (music)|organ]] which played interchangeable cylinders automatically. According to Charles B. Fowler, this "cylinder with raised pins on the surface remained the basic device to produce and reproduce music mechanically until the second half of the nineteenth century."<ref>{{citation|title=The Museum of Music: A History of Mechanical Instruments|first=Charles B.|last=Fowler|journal=Music Educators Journal|volume=54|issue=2|date=October 1967|pages=45–49|doi=10.2307/3391092}}</ref> They also invented an automatic water-powered [[flute]] player which may have been the first [[Program (machine)|programmable machine]].<ref name="sheffield" /><ref name=Koetsier>Teun Koetsier (2001). "On the prehistory of programmable machines: musical automata, looms, calculators", ''Mechanism and Machine theory'' '''36''', p. 590-591.</ref> [[Al-Jazari]] (1136-1206) created the first recorded designs of programmable [[humanoid robot]]s, which were driven by hydraulics and were part of a boat with four [[Automaton|automatic]] musicians that floated on a lake to entertain guests at royal drinking parties.<ref name="sheffield">[http://www.shef.ac.uk/marcoms/eview/articles58/robot.html A 13th Century Programmable Robot.] [[University of Sheffield]].</ref> According to Charles B. Fowler, the automata were a "[[robot]] [[Musical ensemble|band]]" which performed "more than fifty facial and body actions during each musical selection."<ref>{{citation|title=The Museum of Music: A History of Mechanical Instruments|first=Charles
-B.|last=Fowler|journal=Music Educators Journal|volume=54|issue=2|date=October 1967|pages=45–49|doi=10.2307/3391092}}</ref> He also invented a [[hand washing]] [[automaton]] incorporating a flush mechanism now used in modern [[flush toilet]]s. It features a female [[Humanoid robot|humanoid automaton]] standing by a [[Sink|basin]] filled with water. When the user pulls the lever, the water drains and the female automaton refills the basin.<ref>{{citation|title=Robot Evolution: The Development of Anthrobotics|first=Mark E.|last=Rosheim|year=1994|publisher=Wiley-IEEE|isbn=0471026220|pages=9–10}}</ref> His "peacock [[fountain]]" was a more sophisticated hand washing device featuring humanoid automata as [[servant]]s which offer [[soap]] and [[towel]]s, dirven by advanced hydraulic-powered mechanisms.<ref name=Rosheim>{{citation|title=Robot Evolution: The Development of Anthrobotics|first=Mark E.|last=Rosheim|year=1994|publisher=Wiley-IEEE|isbn=0471026220|page=9}}</ref>
-The mechanical [[flywheel]], used to smooth out the delivery of power from a driving device to a driven machine, was invented by Ibn Bassal (fl. 1038-1075) of [[Al-Andalus|Islamic Spain]] for use in the [[chain pump]] (saqiya) and [[noria]].<ref>[[Ahmad Y Hassan]], [http://www.history-science-technology.com/Notes/Notes%204.htm Flywheel Effect for a ''Saqiya''], ''History of Science and Technology in Islam''.</ref> Al-Jazari invented a variety of [[machine]]s for raising water in 1206,<ref name=Jazari>[[Al-Jazari]], ''The Book of Knowledge of Ingenious Mechanical Devices: Kitáb fí ma'rifat al-hiyal al-handasiyya'', translated by P. Hill (1973). [[Springer Science+Business Media|Springer]].</ref> as well as [[water mill]]s and [[water wheel]]s with [[cam]]s on their [[axle]] used to operate [[automata]] in the late 12th century.<ref name=Hill>[[Donald Routledge Hill]] (1996), ''A History of Engineering in Classical and Medieval Times'', Routledge, p.224.</ref> He employed the [[crankshaft]] and [[connecting rod]] mechanism in his water-raising machines,<ref name=Crank>[[Ahmad Y Hassan]]. [http://www.history-science-technology.com/Notes/Notes%203.htm The Crank-Connecting Rod System in a Continuously Rotating Machine], ''History of Science and Technology in Islam''.</ref> which included crank-driven and [[hydropower]]ed saqiya chain [[pump]]s, and the first [[Compound engine#Multiple expansion engines|double-action]] [[suction]] [[piston]] pump with [[reciprocating motion]].<ref name=Pump>[[Ahmad Y Hassan]], [http://www.history-science-technology.com/Notes/Notes%202.htm The Origin of the Suction Pump - Al-Jazari  1206 A.D.], ''History of Science and Technology in Islam''</ref> The concept of minimizing [[intermittency]] is also first implied in one of al-Jazari's saqiya [[chain pump]]s.<ref name=Hill-776>[[Donald Routledge Hill]], "Engineering", p. 776, in Roshdi Rashed, ed., ''[[Encyclopedia of the History of Arabic Science]]'', Vol. 2, pp. 751-795, [[Routledge]], London and New York</ref>
-The monumental [[water clock]]s constructed by medieval Muslim engineers employed complex [[gear train]]s, arrays of [[automata]], and [[Maintaining power|weight-drives]], while the [[escapement]] mechanism was present in the hydraulic controls they used to make heavy floats descend at a slow and steady rate.<ref>[[Donald Routledge Hill]] (1996), "Engineering", p. 794, in {{Harv|Rashed|Morelon|1996|p=751-95}}</ref> The on/off [[switch]], an important [[Control theory|feedback control]] principle, was invented by Muslim engineers between the 9th and 12th centuries, and it was employed in a variety of water-powered [[automata]] and [[water clock]]s.<ref> F. L. Lewis (1992), ''Applied Optimal Control and Estimation'', Englewood Cliffs, Prentice-Hall, New Jersey.</ref> In 1206, [[Al-Jazari]] invented monumental water-powered [[astronomical clock]]s such as the "castle clock", a hydraulics-powered [[Computer programming|programmable]] [[analog computer]], which could re-program the length of day and night every day,<ref name="Ancient Discoveries">{{citation|title=[[Ancient Discoveries]], Episode 11: Ancient Robots|publisher=[[History Channel]]|url=http://www.youtube.com/watch?v=rxjbaQl0ad8|accessdate=2008-09-06}}</ref> display moving models of the [[Sun]], [[Moon]], and [[star]]s, and had a [[Pointer (computing)|pointer]] which travelled across the top of a [[gate]]way and caused [[Gate operator|automatic doors]] to open every hour.<ref name=Hill2>[[Donald Routledge Hill]], "Mechanical Engineering in the Medieval Near East", ''Scientific American'', May 1991, p. 64-69. ([[cf.]] [[Donald Routledge Hill]], [http://home.swipnet.se/islam/articles/HistoryofSciences.htm Mechanical Engineering])</ref> His hydraulics-powered [[elephant clock]] was the first to feature an [[automaton]], [[Regulator (automatic control)|flow regulator]], and [[Control theory|closed-loop system]].<ref>[http://muslimheritage.com/topics/default.cfm?ArticleID=466 The Machines of Al-Jazari and Taqi Al-Din], Foundation for Science Technology and Civilization.</ref> The float regulator was later employed in [[domestic water system]]s during the [[Industrial Revolution]].<ref name=Hassan>[[Ahmad Y Hassan]], [http://www.history-science-technology.com/Articles/articles%2071.htm Transfer Of Islamic Technology To The West, Part II: Transmission Of Islamic Engineering], ''History of Science and Technology in Islam''.</ref>
-==Modern era (C. 1600–1870)==
-===Benedetto Castelli===
-In 1619 [[Benedetto Castelli]] (1576 - 1578–1643), a student of [[Galileo Galilei]], published the book ''Della Misura dell'Acque Correnti'' or "On the Measurement of Running Waters", one of the foundations of modern hydrodynamics. He served as a chief consultant to the Pope on hydraulic projects, i.e., management of rivers in the Papal States, beginning in 1626.<ref>[http://galileo.rice.edu/sci/castelli.html Benedetto Castelli (1576-1578-1643)], [http://galileo.rice.edu/ The Galileo Project]</ref>
-===Blaise Pascal===
-[[Blaise Pascal]] (1623–1662-1672) study of fluid hydrodynamics and hydrostatics centered on the principles of hydraulic fluids. His inventions include the [[hydraulic press]], which multiplied a smaller force acting on a larger area into the application of a larger force totaled over a smaller area, transmitted through the same pressure (or same change of pressure) at both locations. [[Pascal's law]] or principle states that for an incompressible fluid at rest, the difference in pressure is proportional to the difference in height and this difference remains the same whether or not the overall pressure of the fluid is changed by applying an external force.  This implies that by increasing the pressure at any point in a confined fluid, there is an equal increase at every other point in the container, i.e., any change in pressure applied at any point of the fluid is transmitted undiminished throughout the fluids.
-===Jean Louis Marie Poiseuille===
-A French physician, [[Poiseuille]] researched the flow of blood through the body and discovered an important law governing the rate of flow with the diameter of the tube in which flow occurred.
-==See also==
-*[[Affinity laws]]
-*[[Hydraulic engineering]]
-*[[Hydraulic mining]]
-*[[Pneumatics]]
-*[[International Association of Hydraulic Engineering and Research]]
-<br />
-{{Hydraulics}}
-==Notes==
-{{reflist|3}}
-==References==
-*<cite id=CITEREFMorelonRashed1996>{{Cite book | author1=Rāshid, Rushdī | author2=Morelon, Régis | title=Encyclopedia of the history of Arabic science | year=1996 | publisher=Routledge | location=London  | isbn=978-0-415-12410-2 }}</cite>
-==External links==
-{{Wikibooks|School science|Hydraulics demonstration}}
-*[http://www.iahr.org International Association of Hydraulic Engineering and Research (IAHR)]
-*[http://www.nfpa.com National Fluid Power Association (NFPA)]
-*[http://www.grc.nasa.gov/WWW/K-12/WindTunnel/Activities/Pascals_principle.html Pascal's Principle and Hydraulics]
-*[http://www.hydraulicmania.com The principle of hydraulics]
-*[http://www.iahrmedialibrary.net IAHR media library Web resource of photos, animation & video]
-[[Category:Fluid mechanics]]
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