Chain pump
Ancient water pump using discs on an endless chain.
The chain pump moves water using an endless chain fitted with circular discs. One section of the chain sits in the water, while the rest runs inside a tube that is just a bit wider than the discs. When the chain is pulled upward through the tube, water gets trapped between the discs and is carried up to the top, where it spills out. This kind of pump was used for many centuries across the ancient Middle East, Europe, and China.
In the Near East and Europe, the earliest known evidence comes from a Babylonian text dating to around 700 B.C. These pumps were usually powered by people or animals. By about 200 B.C., they appeared in ancient Egypt, now fitted with a pair of gear wheels. The Greeks and Romans also used a version, sometimes with pots or scoops attached to the chain that tipped out water as they passed over the top pulley; a 2nd-century example survives in London. Philo of Byzantium wrote about such a device in the 2nd century B.C., and the historian Vitruvius mentioned them around 30 B.C. Fragments of cogs, a crank, and discs from a bilge pump on a 1st-century Roman barge were found at Lake Nemi. During the Renaissance, chain pumps were used in European mines—mineralogist Georg Agricola illustrated them in his 1556 book *De re metallica*. They were also common on naval vessels for pumping bilges, and examples from the 19th century are known for low-lift irrigation.
In China, chain pumps were used from at least the 1st century A.D., where they were called dragon backbones. One early account comes from the Han dynasty philosopher Wang Chong (A.D. 27–97), writing around A.D. 80. Unlike Western versions, Chinese chain pumps used square pallets instead of pear-shaped buckets. Illustrations show them drawing water up a slanted channel. Some were powered by hydraulics—a rushing current turned a horizontal water wheel that drove a vertical wheel—while others used a horizontal mechanical wheel turned by oxen, which then drove a vertical wheel. There were also square-pallet chain pumps operated by pedals. From the 1st century onward, they spread widely across the Chinese countryside, mostly for irrigation but also for public works. The Eastern Han court eunuch Zhang Rang (d. A.D. 189) ordered the engineer Bi Lan to build a series of square-pallet chain pumps outside the capital Luoyang, which supplied water to palaces and living quarters via a pipe system. T
- earliest_evidence
- Babylonian text from about 700 B.C.
- ancient_Egypt_appearance
- about 200 B.C.
- China_earliest_account
- 1st century A.D.
- known_for
- Water lifting for irrigation, drainage, and bilge pumping
- common_power_sources
- Humans, animals, hydraulics, windmills
Lore & Background
The earliest evidence for the chain pump is in a Babylonian text from about 700 B.C. They were commonly powered by humans or animals. The device then appeared in ancient Egypt from about 200 B.C., featuring a pair of gear-wheels. A version of the chain pump was used in ancient Greece and Rome, sometimes with pots or scoops fixed to the chain, which, as they passed over the top pulley, tipped the water out; a 2nd-century example is preserved in London. Philo of Byzantium wrote of such a device in the 2nd century B.C.; the historian Vitruvius mentioned them around 30 B.C. Fragments of the cogs, crank, and discs, of a bilge pump, from a 1st-century Roman barge, were unearthed at Lake Nemi. Chain pumps were used in European mines during the Renaissance; mineralogist Georg Agricola illustrated them in his De re metallica (1556). 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.
Chain pumps were also used in ancient China from at least the 1st century A.D. In China, they were also called dragon backbones. One of the earliest accounts was a description by the Han dynasty philosopher Wang Chong (A.D. 27–97) around A.D. 80. Unlike those found in the West, chain pumps in China resembled the square-pallet type instead of the pear-shaped bucket. 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, and others by a horizontal mechanical wheel acting upon a vertical wheel that was pulled by the labor of oxen. There were also square-pallet chain pumps operated by pedals. From the 1st century onwards, chain pumps were widespread throughout the Chinese countryside.
Reader's Guide
The chain pump represents a significant early technology for lifting water, with independent development in the Middle East, Europe, and China. Its earliest known evidence dates to about 700 B.C. in Babylon, and it was later adopted in ancient Egypt, Greece, and Rome, where it was used for bilge pumping on ships and for irrigation. In China, the square-pallet chain pump, known as the dragon backbone, was in use from at least the 1st century A.D. and became widespread for irrigation and public works. During the Song dynasty (10th–13th centuries), the technology was improved and actively spread by the government, contributing to agricultural expansion. The chain pump's design varied regionally: Western versions often used pear-shaped buckets or discs, while Chinese versions used square pallets. Power sources included human labor, animals, hydraulics, and later windmills acquired from the Middle East. The device remained in use for centuries, with examples known into the 19th century for low-lift irrigation. Its legacy lies in its long history of practical water management across multiple civilizations.
Did You Know?
- The earliest evidence for the chain pump is a Babylonian text from about 700 B.C.
- In China, chain pumps were called dragon backbones.
- Fragments of a chain pump from a 1st-century Roman barge were unearthed at Lake Nemi.
- Chinese chain pumps were sometimes powered by hydraulics using a horizontal water wheel.
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