Ismail al-Jazari

The elephant clock was one of the most famous inventions of al-Jazari.

Badīʿ az-Zaman Abu l-ʿIzz ibn Ismāʿīl ibn ar-Razāz al-Jazarī (1136–1206, Template:Langx, Template:IPA) was a Muslim polymath:<ref>Template:Cite book</ref> a scholar, inventor, mechanical engineer, artisan and artist from the Artuqid Dynasty of Jazira in Mesopotamia. He is best known for writing The Book of Knowledge of Ingenious Mechanical Devices (Template:Langx, also known as Automata) in 1206, where he described 50 mechanical devices, along with instructions on how to construct them. One of his more famous inventions is the elephant clock.Template:Sfn He has been described as the "father of robotics" and modern day engineering.<ref>Template:Cite web</ref>

Biography

Diagram of a hydropowered perpetual flute from The Book of Knowledge of Ingenious Mechanical Devices by Al-Jazari in 1206.

Al-Jazari was born in the area of Upper Mesopotamia in 1136. Sources state his exact location is unknown, but they speculate he could have been born in Jazirat ibn Umar, where he got the name Jazari from or Al-Jazira which was used to denote Upper Mesopotamia.<ref>Template:Cite book</ref><ref>Template:Cite magazine</ref><ref>Template:Cite book</ref> The only biographical information known about him is contained in his Book of Knowledge of Ingenious Mechanical Devices.<ref name=dfmms>Template:Cite book</ref> Like his father before him, he served as chief engineer at the Artuklu Palace, the residence of the Mardin branch of the Artuqids which ruled across Upper Mesopotamia as vassals of the Zengid dynasty of Mosul and later of Ayyubid general Saladin.<ref name=Hill2>Donald Hill, "Mechanical Engineering in the Medieval Near East", Scientific American, May 1991, pp. 64-9 (cf. Donald Hill, Mechanical Engineering Template:Webarchive)</ref> Little is known about his ethnic background, so he has been variously described as Arab,<ref>Template:Cite book</ref><ref name="banu-musa-translated-by-hill">Template:Cite book</ref>Template:Rp<ref>Template:Cite journal</ref><ref>Template:Cite book</ref> Kurdish<ref>Template:Cite book</ref><ref>Template:Cite book
Template:Cite book</ref> or Persian.<ref>Template:Cite book</ref>

Al-Jazari was part of a tradition of artisans and was thus more a practical engineer than an inventor<ref>Donald R. Hill, in Dictionary of scientific biography, 15, suppl. I, p. 254.</ref> who appears to have been "more interested in the craftsmanship necessary to construct the devices than in the technology which lay behind them" and his machines were usually "assembled by trial and error rather than by theoretical calculation".<ref>Template:Cite journal</ref> His Book of Knowledge of Ingenious Mechanical Devices appears to have been quite popular as it appears in a large number of manuscript copies, and as he explains repeatedly, he only describes devices he has built himself. According to Mayr, the book's style resembles that of a modern "do-it-yourself" book.<ref>Template:Cite book</ref>

Some of his devices were inspired by earlier devices, such as one of his monumental water clocks, which was based on that of a Pseudo-Archimedes.<ref>Template:Cite web</ref> He also cites the influence of the Banū Mūsā brothers for his fountains, al-Saghani for the design of a candle clock, and Hibatullah ibn al-Husayn (d. 1139) for musical automata. Al-Jazari goes on to describe the improvements he made to the work of his predecessors, and describes a number of devices, techniques and components that are original innovations which do not appear in the works by his precessors.<ref name="banu-musa-translated-by-hill" />Template:Rp

1206 edition (Ahmet III 3472)

The Artuqid ruler Nasr al-Din Mahmud (r. 1201–1222) is known to have commissioned the first edition of Al-Jāmi' fī ṣinā'at al-ḥiyal of Ibn al-Razzaz al-Jazari, in April 1206 at the Artuqid court.<ref name="LB">Template:Cite journal</ref><ref name="RW">Template:Cite journal</ref> This manuscript is known as Ahmet III 3472, now in the Topkapı Sarayı Library. The miniatures are thought to reflect various aspects of the Artuqid court at the time.<ref name="LB"/> Ibn al-Razzaz al-Jazari was employed at the Artuqid court during the last quarter of the 12th century, and this is the earliest known manuscript of his opus.<ref name="RW"/>

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  Court scene. Amid, modern-day Diyarbakır, Turkey, 1206 (Ms. Ahmet III 3472).<ref name="LB"/>
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  Mechanical Turkic servant. Amid, modern-day Diyarbakır, Turkey, 1206 (Ms. Ahmet III 3472).<ref name="LB"/>
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  Female servant. Amid, modern-day Diyarbakır, Turkey, 1206 (Ms. Ahmet III 3472).<ref name="LB"/>
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  Mechanical Turkic servant. Amid, modern-day Diyarbakır, Turkey, 1206 (Ms. Ahmet III 3472).<ref name="LB"/>

Mechanisms and methods

The most significant aspect of al-Jazari's machines are the mechanisms, components, ideas, methods, and design features which they employ.<ref name=Hill2/>

Camshaft

A camshaft, a shaft to which cams are attached, was described in 1206 by al-Jazari, who employed them in his automata,<ref name="Ifrah">Georges Ifrah (2001). The Universal History of Computing: From the Abacus to the Quatum Computer, p. 171, Trans. E.F. Harding, John Wiley & Sons, Inc. (See [1] Template:Webarchive)</ref> water clocks (such as the candle clock)<ref name="Ancient Discoveries"/> and water-raising machines.<ref name=Ifrah/>

Crankshaft and crank-slider mechanism

The eccentrically mounted handle of the rotary quern-stone in fifth century BCE Spain that spread across the Roman Empire constitutes a crank.<ref name="Ritti et al. 2007, 159">Tullia Ritti, Klaus Grewe, Paul Kessener: "A Relief of a Water-powered Stone Saw Mill on a Sarcophagus at Hierapolis and its Implications", Journal of Roman Archaeology, Vol. 20 (2007), pp. 138–163 (159)</ref> The earliest evidence of a crank and connecting rod mechanism dates to the 3rd century AD Hierapolis sawmill in the Roman Empire.<ref name="Ritti et al. 2007, 159"/> The crank also appears in the mid-9th century in several of the hydraulic devices described by the Banū Mūsā brothers in their Book of Ingenious Devices.<ref>Template:Cite book</ref>

In 1206, al-Jazari invented an early crankshaft,<ref name=Ganchy/><ref name=Vallely/> which he incorporated with a crank-connecting rod mechanism in his twin-cylinder pump.<ref name=Crank/> Like the modern crankshaft, al-Jazari's mechanism consisted of a wheel setting several crankpins into motion, with the wheel's motion being circular and the pins moving back-and-forth in a straight line.<ref name=Ganchy>Template:Citation</ref> The crankshaft described by al-Jazari<ref name="Ganchy"/><ref name=Vallely/> transforms continuous rotary motion into a linear reciprocating motion,<ref name=Crank/> and is central to modern machinery such as the steam engine, internal combustion engine and automatic controls.<ref name=Vallely>Paul Vallely, How Islamic Inventors Changed the World, The Independent, 11 March 2006.</ref>Template:Sfn

He used the crankshaft with a connecting rod in two of his water-raising machines: the crank-driven saqiya chain pump and the double-action reciprocating piston suction pump.<ref name=Crank>Ahmad Y. al-Hassan, The Crank-Connecting Rod System in a Continuously Rotating Machine Template:Webarchive</ref><ref>Template:Cite book</ref> His water pump also employed the first known crank-slider mechanism.<ref name=dfmms />

Design and construction methods

English technology historian Donald Hill writes:

Escapement mechanism in a rotating wheel

Al-Jazari invented a method for controlling the speed of rotation of a wheel using an escapement mechanism.<ref>Donald Hill, "Engineering", in Roshdi Rashed, ed., Encyclopedia of the History of Arabic Science, Vol. 2, pp. 751–795 [792]. Routledge, London and New York.</ref>

Mechanical controls

According to Donald Hill, al-Jazari described several early mechanical controls, including "a large metal door, a combination lock and a lock with four bolts".<ref name=Hill2/>

Conical valve and segmental gear

A segmental gear is "a piece for receiving or communicating reciprocating motion from or to a cogwheel, consisting of a sector of a circular gear, or ring, having cogs on the periphery, or face."<ref>Segment gear, TheFreeDictionary.com</ref> Lynn Townsend White wrote:Template:Sfn Template:Blockquote

Water-raising machines

Al-Jazari's hydropowered saqiya chain pump device.

Al-Jazari invented five machines for raising water,<ref name="Jazari"/> as well as watermills and water wheels with cams on their axle used to operate automata,<ref name=Hill/> in the 12th and 13th centuries, and described them in 1206. It was in these water-raising machines that he introduced his most important ideas and components.

Saqiya chain pumps

The first known use of a crankshaft in a chain pump was in one of al-Jazari's saqiya machines. The concept of minimizing intermittent working is also first implied in one of al-Jazari's saqiya chain pumps, which was for the purpose of maximising the efficiency of the saqiya chain pump. Al-Jazari also constructed a water-raising saqiya chain pump which was run by hydropower rather than manual labour, though the Chinese were also using hydropower for chain pumps prior to him. Saqiya machines like the ones he described have been supplying water in Damascus since the 13th century up until modern times,<ref name=Hassan>Ahmad Y. al-Hassan, al-Jazari and the History of the Water Clock Template:Webarchive</ref> and were in everyday use throughout the medieval Islamic world.<ref name=Hill-776>Donald Hill, "Engineering", in Roshdi Rashed, ed., Encyclopedia of the History of Arabic Science, Vol. 2, pp. 751–795 [776]. Routledge, London and New York.</ref> Interestingly, the depiction of the chain in al-Jazari's pump appears to be in the form of a Möbius strip, from long before the Möbius strip was first identified as an object of study in mathematics.<ref>Template:Cite journal</ref>

Double-action suction pump with valves and reciprocating piston motion

Al-Jazari described suction pipes, suction pump, double-action pump, and made early uses of valves and a crankshaft-connecting rod mechanism, when he developed a twin-cylinder reciprocating piston suction pump. This pump is driven by a water wheel, which drives, through a system of gears, an oscillating slot-rod to which the rods of two pistons are attached. The pistons work in horizontally opposed cylinders, each provided with valve-operated suction and delivery pipes. The delivery pipes are joined above the centre of the machine to form a single outlet into the irrigation system. This water-raising machine had a direct significance for the development of modern engineering. This pump is remarkable for three reasons:<ref name=Hill2/><ref>Template:Cite web</ref>Template:SfnTemplate:Sfn

• The first known use of a true suction pipe (which sucks fluids into a partial vacuum) in a pump.
• The first application of the double-acting principle.
• The conversion of rotary to reciprocating motion via the crank-connecting rod mechanism.

Al-Jazari's suction piston pump could lift 13.6 metres of water,Template:Citation needed with the help of delivery pipes. It was not, however, any more efficient than the noria commonly used by the Muslim world at the time.Template:Sfn

Al-Jazari cited the Byzantine siphon used for discharging Greek fire as an inspiration for his pump.Template:Sfn According to Donald Hill, al-Jazari's pump can be considered "a direct ancestor of the steam engine combination".Template:Sfn According to Joseph Needham, al-Jazari's slot-rod force pump is one of "the two machines of the Middle Ages which lie most directly in the line of ancestry of the steam-engine and the locomotive" along with Wang Zhen's blowing engine a century later.<ref>Template:Cite book</ref>

Single-bucket and four-bucket water lifting machines

Al-Jazari described single-bucket and four-bucket water lifting machines. The single-bucket version employs differentials, semi-circular gear units, bucket elevators, and gearboxes, while the four-bucket version adds a mechanical timer.

Water supply system

Al-Jazari developed the earliest water supply system to be driven by gears and hydropower, which was built in 13th century Damascus to supply water to its mosques and Bimaristan hospitals. The system had water from a lake turn a scoop-wheel and a system of gears which transported jars of water up to a water channel that led to mosques and hospitals in the city.<ref name=Turner>Howard R. Turner (1997), Science in Medieval Islam: An Illustrated Introduction, p. 81, University of Texas Press, Template:ISBN</ref>

Automata

Al-Jazari built automated moving peacocks driven by hydropower.<ref>al-Jazari (Islamic artist), Encyclopædia Britannica.</ref> He also created automatic doors as part of one of his elaborate water clocks,<ref name=Hill2/> and invented water wheels with cams on their axle used to operate automata.<ref name=Hill/> According to Encyclopædia Britannica, the Italian Renaissance inventor Leonardo da Vinci may have been influenced by the classic automata of al-Jazari.<ref>Template:Cite encyclopedia</ref>

Mark E. Rosheim summarizes the advances in robotics made by Muslim engineers, especially al-Jazari, as follows:

Drink-serving waitress

One of al-Jazari's humanoid automata was a waitress that could serve water, tea or drinks. The drink was stored in a tank with a reservoir from where the drink drips into a bucket and, after seven minutes, into a cup, after which the waitress appears out of an automatic door serving the drink.<ref>Template:CitationTemplate:Cbignore</ref>

Hand-washing automaton with flush mechanism

Al-Jazari invented a hand washing automaton incorporating a flush mechanism now used in modern flush toilets. This device is another example of humanoid automata. It consisted of a human figure, made from jointed copper, holding a pitcher resembling a peacock in its right hand. The pitcher is made from brass and holds within it a chamber, divided into two parts by a metal plate. This mechanism aided the pouring of the water from the spout so that it was smooth and would not splutter. The reservoir in which the water is held is situated within the right-hand side of the human figure. An axle is fitted into the right elbow of the human figure so as to allow the liquid to pour from the reservoir through the spout of the pitcher. The left arm of the figure had a fixed weight which would raise and lower the arm which would hold a towel, comb and mirror.

This automaton was designed to aid the king whilst he performed his ritual ablutions. A servant of the king would carry the figure and place it next to a basin that could hold liquid. The servant then turned a knob on the back of the figure which opened a valve resulting in the pouring of water from the right hand of the figure into the basin. When the reservoir is nearly empty and most of the water has been poured a mechanism is prompted and the left hand of the figure, holding the towel, comb and mirror, is extended out in the direction of the king so that he can dry himself and tend to his beard.<ref>Template:Cite book</ref>

Peacock fountain with automated servants

Water and its usages holds particular importance in Islam; both as being an integral part of the pre-prayer washing processes wudu and ghusl, and a key feature in Islamic gardens – four fountains featuring in the Paradise Garden; the Islamic final resting place referenced in the Quran. Additionally, with Mesopotamia being a naturally drought-ridden place, machines relating to water held a significant function; in both a divine and practical sense.

An entire section of The Book of Knowledge of Ingenious Mechanical Devices was devoted to fountain mechanisms, titled: On the construction in pools of fountains which change their shape, and of machines for the perpetual flute.<ref>Template:Cite journal</ref>

Al-Jazari's "peacock fountain" was a more sophisticated hand washing device featuring humanoid automata as servants which offer soap and towels. Mark E. Rosheim describes it as follows:<ref name="Rosheim">Template:Citation</ref>

Al-Jazari's Peacock Fountain

The basin of the "peacock fountain" formed the basin for performing wudu, and it would have been operated by a servant, who would have pulled the plug and positioned the peacock's beak; allowing the mechanism to release the water into the basin in front of the user.<ref>Template:Cite web</ref>

However, whilst water moving objects such as the peacock fountain had ritualistic usage, there is suggestion that water-moving hydraulics were put to profane use. Ayhan Aytes suggests that:<ref>Template:Cite encyclopedia</ref>

Many of the devices also had additional functions that contradicted divine omnipotence. The most profane purpose of several of his hydraulic and pnuematic automata was to get guests at parties drunk as quickly as possible.

Musical robot band

Al-Jazari's musical robot band.

Al-Jazari's work described fountains and musical automata, in which the flow of water alternated from one large tank to another at hourly or half-hourly intervals. This operation was achieved through his innovative use of hydraulic switching.<ref name=Hill2/>

Al-Jazari created a musical automaton, which was a boat with four automatic musicians that floated on a lake to entertain guests at royal drinking parties. Professor Noel Sharkey has argued that it is quite likely that it was an early programmable automata and has produced a possible reconstruction of the mechanism; it has a programmable drum machine with pegs (cams) that bump into little levers that operated the percussion. The drummer could be made to play different rhythms and different drum patterns if the pegs were moved around.<ref name=Sharkey>Professor Noel Sharkey, A 13th Century Programmable Robot (Archive), University of Sheffield.</ref>

The water-clock of the drummers

The water-clock of the drummers

The water-clock of the drummers, which differs from the Musical robot band in that it lacks a flute-playing doll and instead has two trumpeters, consists of seven wood-jointed male figures, including the aforementioned trumpeters as well as two dolls playing cymbals and the rest playing other percussive instruments.<ref>The Book of Knowledge of Ingenious Mechanical Devices by Ibn al-Razzaz al-Jazari Translated by Donald R. Hill, 01-01-1974</ref> The mechanism in this specific automaton serves as a clock by producing a musical output once every hour, illustrating Al-Jazari's ability to create multi-faceted automata that functioned on a practical and entertainment level. The motion of the automaton is initiated at daybreak by another male doll, who stands at the edge of the frieze element of the design, moving across until he reaches a specific point at which a carved falcon leans forward dropping a ball from its beak onto a cymbal.<ref>Template:Cite web</ref> All mechanical aspects of the automaton are then driven by water and a series of pistons and cables. Each hour water drains out of the main cistern to cause another bucket to tip over driving a water wheel that is connected to the musicians. The automaton is described to 'perform a with a clamorous sound which is heard from afar' and could play several different tunes.<ref>2.Prehistory of Musical Robots, Michael Krzyzaniak, Arizona State University, School of Arts, Media and Engineering</ref> Like many other automatons by Al-Jazari, this was created to entertain guests at the royal palace.

Clocks

Al-Jazari constructed a variety of water clocks and candle clocks. These included a portable water-powered scribe clock, which was a meter high and half a meter wide, reconstructed successfully at the Science Museum in 1976<ref name=Hill>Donald Hill (1996), A History of Engineering in Classical and Medieval Times, Routledge, p. 224</ref><ref name="Razzaz Al-Jazari 1974">Ibn al-Razzaz Al-Jazari (ed. 1974) The Book of Knowledge of Ingenious Mechanical Devices, Translated and annotated by Donald Hill, Dordrecht / D. Reidel, part II.</ref> Al-Jazari also invented monumental water-powered astronomical clocks which displayed moving models of the Sun, Moon, and stars.

Candle clocks

One of al-Jazari's candle clocks.

According to Donald Hill, al-Jazari constructed the most sophisticated candle clocks known to date. Hill described one of al-Jazari's candle clocks as follows:<ref name=Hill2/>

Al-Jazari's candle clock also included a dial to display the time and, for the first time, employed a bayonet fitting, a fastening mechanism still used in modern times.<ref>Template:CitationTemplate:Cbignore</ref>

Elephant clock

The elephant clock described by al-Jazari in 1206 is notable for several innovations. It was the first clock in which an automaton reacted after certain intervals of time (in this case, a humanoid robot striking the cymbal and a mechanical robotic bird chirping) and the first water clock to accurately record the passage of the temporal hours to match the uneven length of days throughout the year.<ref>Template:Citation</ref>

Automatic castle clock of al-Jazari, 14th century copy.

Castle clock

Template:See also Al-Jazari's largest astronomical clock was the "castle clock", which was a complex device that was about Template:Convert high, and had multiple functions besides timekeeping. It included a display of the zodiac and the solar and lunar orbits, and an innovative feature of the device was a pointer in the shape of the crescent moon which travelled across the top of a gateway, moved by a hidden cart, and caused automatic doors to open, each revealing a mannequin, every hour.<ref name=Hill2/><ref>Howard R. Turner (1997), Science in Medieval Islam: An Illustrated Introduction, p. 184. University of Texas Press, Template:ISBN.</ref>

Another feature of the device was five automata musicians who automatically play music when moved by levers operated by a hidden camshaft attached to a water wheel.<ref name="Ancient Discoveries">Template:CitationTemplate:Cbignore</ref>

Al-Jazari invented water clocks that were driven by both water and weights. These included geared clocks and a portable water-powered scribe clock, which was a meter high and half a meter wide. The scribe with his pen was synonymous to the hour hand of a modern clock.<ref name="Hill"/><ref name="Razzaz Al-Jazari 1974" /> Al-Jazari's famous water-powered scribe clock was reconstructed successfully at the Science Museum, London in 1976.

Miniature paintings

Alongside his accomplishments as an inventor and engineer, al-Jazari was also an accomplished artist. In The Book of Knowledge of Ingenious Mechanical Devices, he gave instructions of his inventions and illustrated them using miniature paintings, a medieval style of Islamic art.

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  One of al-Jazari's candle clocks.
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  The musical robot band designed by al-Jazari.
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  A table device automaton designed by al-Jazari.
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  The hand-washing automaton with a flush mechanism designed by al-Jazari.
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  Al-Jazari's hydropowered saqiya chain pump device.
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  An illustration of a device invented by al-Jazari.
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  A sketch of a device designed by al-Jazari. From the manuscript of Kitabal Al-Hial in Aga Khan Museum, Toronto.

See also

• Hero of Alexandria
• History of the internal combustion engine
• List of inventions in the medieval Islamic world
• Islamic Golden Age
• Science in the medieval Islamic world
• Lists of Muslim scientists and scholars
• Taqi ad-Din Muhammad ibn Ma'ruf

References

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• Claus-Peter Haase, Modest Variations—Theoretical Tradition and Practical Innovation in the Mechanical Arts from Antiquity to the Arab Middle Ages, in: Template:Cite book
• Ulrich Alertz, The Horologium of Hārūn al-Rashīd Presented to Charlemagne – An Attempt to Identify and Reconstruct the Clock Using the Instructions Given by al-Jazarī, in: Template:Cite book
• George Saliba, Blurred Edges—At the Intersection of Science, Culture, and Art, in: Template:Cite book
• Amnon Shiloah, The Paradigmatic-Individualistic Approach of Arab Musical Creativeness, in: Template:Cite book
• Eilhard Wiedemann, On Musical Automata, in: Template:Cite book
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Further reading

• Template:Cite encyclopedia

External links

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• "Al Jazari's Book - The Book Of Knowledge Of Ingenious Mechanical Devices'