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chain pump
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The chain pump is type of a water pump in which several circular discs are positioned on an endless chain. One part of the chain dips into the water, and the chain runs through a tube, slightly bigger than the diameter of the discs. As the chain is drawn up the tube, water becomes trapped between the discs and is lifted to and discharged at the top. Chain pumps were used for centuries in the ancient Middle East, Europe, China.

In the Near East and Europe

The earliest evidence for this device is in a Babylonian text from about 700 B.C. They were commonly powered by humans or animals.Joseph Needham, Science and Civilisation in China 4(2) (1965), p. 352. The device then appeared in ancient Egypt from about 200 B.C., featuring a pair of gear-wheels{{dubious|Sound exactly like the oldest saqiya/sakia occurrence in Ptolemaic Egypt. Most likely a confusion!|date=February 2015}}.Donald Routledge Hill (1996), "Engineering", in Roshdi Rashed, Encyclopedia of the History of Arabic Science, Vol. 3, pp. 751–795 [771].A version of the chain pump was used in Ancient Greek and Roman times, sometimes with pots fixed to the chain, which, as they passed over the top pulley, tipped the water out{{dubious|Pots are typical of saqiyas, pulleys of chain pumps. Needs checking.|date=February 2015}}. Philo of Byzantium wrote of such a device in the 2nd century B.C.; the historian Vitruvius mentioned it around 30 B.C. Fragments of these buckets were found on the Roman barges of Lake Nemi{{dubious|Same problem.If pots, not disks: more likely a sakia. Check.|date=February 2015}}.Needham, Volume 4, Part 2, p. 109.Chain pumps were used in European mines during the Renaissance; mineralogist Georg Agricola illustrated them in his De re metallica (1556).G. Agricola, In Re Metallica, . They were used in dockyards, and several formed part of the Portsmouth Block Mills complex.{{Citation needed|date=April 2007}} Chain pumps were commonly used on naval vessels of the time to pump the bilges, and examples are known in the nineteenth century for low-lift irrigation.

China

missing image!
- Tiangong Kaiwu Chain Pumps.jpg -
Two types of hydraulic-powered chain pump from the Chinese encyclopedia Tiangong Kaiwu (1637), written by Song Yingxing.
Chain pumps were also used in ancient China by at least the 1st century A.D. In China, they were also called dragon backbones.Needham, Volume 4, Part 2, 89, 110. One of the earliest accounts was a description by the Han Dynasty philosopher Wang Chong (A.D. 27–97) around A.D. 80.Needham, Volume 4, Part 2, p. 344. Unlike those found in the West, chain pumps in China resembled the square-pallet type instead of the pear-shaped bucket{{dubious|pear-shaped buckets are more typical for sakias, disks or square pallets for chain pumps; check!|date=February 2015}}. Illustrations of such Chinese chain pumps show them drawing water up a slanted channel. These were sometimes powered by hydraulics of a rushing current against a horizontal water wheel acting against a vertical wheel,Needham, Volume 4, Part 2, pp. 342–343. and others by a horizontal mechanical wheel acting upon a vertical wheel that was pulled by the labor of oxen{{dubious|1-Syntax unclear, sounds like the oxen moving the vert. wheel, so what's the horiz. one's role? 2- If this corresponds to ill.: upper one is a water-wheel moving - what? Unclear. Maybe a pallets pump? Lower one shows no sign of a chain pump at all, rather a water-wheel moving a sakia-type chain of jugs. CHECK.|date=February 2015}}.Needham, Volume 6, Part 2, p. 500. There were also square-pallet chain pumps operated by pedals.Needham, Volume 4, Part 2, pp. 340–341.From the 1st century onwards, chain pumps were widespread throughout the Chinese countryside.Needham, Volume 4, Part 2, p. 110. Chinese square-pallet chain pumps were used mostly for irrigation, though they found use in public works as well. The infamous Eastern Han court eunuch Zhang Rang (d. A.D. 189) once ordered the engineer Bi Lan (畢嵐) to construct a series of square-pallet chain pumps outside the capital city Luoyang.Needham, Volume 4, Part 2, p. 33. These chain pumps serviced the palaces and living quarters of the Luoyang; the water lifted by the chain pumps was brought in by a pipe system. Ma Jun, the renowned mechanical engineer of the Three Kingdoms era, also constructed a series of chain pumps for watering the palatial gardens of Emperor Ming of Wei (226–239).Needham, Volume 4, Part 2, p. 40.During the period of agricultural expansion in Song China (10th-13th centuries CE), the technology of water-rising devices was improved. For some centuries they had been used for moving water for drainage or irrigation purposes. The simplest design, such as the counterbalanced bucket or 'swape' or 'well-sweep' was found almost universally. A more complicated design, the 'square-pallet chain pump', was introduced several centuries before the growth in Song technology, but had not been used until then for farming. They became more common around the end of the first millennium AD.BOOK, Elvin, Mark, The Patterns of the Chinese Past, Stanford University Press, 1973, 0-8047-0876-2, 127, registration,weblink From the 13th century onwards, the Chinese also used windmills (acquired from the Middle East) to power square-pallet chain pumps.Needham, Volume 4, Part 2, p. 558. Yet there were other types of chain pumps besides the square-pallet design. In Song Yingxing's (1587–1666) encyclopedic book the Tiangong Kaiwu (1637), there is description and illustration of a cylinder chain pump, powered by waterwheels and leading water up from the river to an elevated plain of agricultural crops.Song, 15.The contribution of chain pumps to agricultural growth during the Song was extolled by poets such as Li Chuquan (李处权) of the twelfth century. The Song government actively spread the technology, introducing pumping equipment and chain pumps to those areas as yet unfamiliar with the technique.BOOK, Elvin, Mark, The Patterns of the Chinese Past, Stanford University Press, 1973, 0-8047-0876-2, 126, registration,weblink

See also

Notes

{{Reflist|colwidth=35em}}

References

{{Commons category|Chain pumps}}
  • Needham, Joseph (1986). Science and Civilization in China: Volume 4, Physics and Physical Technology, Part 2, Mechanical Engineering. Taipei: Caves Books, Ltd.
  • Needham, Joseph (1986). Science and Civilization in China: Volume 6, Biology and Biological Technology, Part 2, Agriculture. Taipei: Caves Books Ltd.
  • Song, Yingxing, translated with preface by E-Tu Zen Sun and Shiou-Chuan Sun (1966). T'ien-Kung K'ai-Wu: Chinese Technology in the Seventeenth Century. University Park: Pennsylvania State University Press.


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