Last updated
The upper stone of a Scottish hand quern from Dalgarven Mill, North Ayrshire Quernupper.jpg
The upper stone of a Scottish hand quern from Dalgarven Mill, North Ayrshire
An ancient tool used to grind food items in Nepal jaaNto.jpg
An ancient tool used to grind food items in Nepal
Nepali women using quern-stones to grind a food item

Quern-stones are stone tools for hand-grinding a wide variety of materials. They are used in pairs. The lower, stationary, stone is called a quern, while the upper mobile stone is called a handstone. The central hole is called the hopper and a handle slot enables the handstone to be rotated. [1] They were first used in the Neolithic era to grind cereals into flour. [2]

Rock (geology) A naturally occurring solid aggregate of one or more minerals or mineraloids

A rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition and the way in which it is formed. Rocks are usually grouped into three main groups: igneous rocks, metamorphic rocks and sedimentary rocks. Rocks form the Earth's outer solid layer, the crust.

Grinding (abrasive cutting) abrasive machining process that uses a grinding wheel as the cutting tool

Grinding is an abrasive machining process that uses a grinding wheel as the cutting tool.

The Neolithic, the final division of the Stone Age, began about 12,000 years ago when the first developments of farming appeared in the Epipalaeolithic Near East, and later in other parts of the world. The division lasted until the transitional period of the Chalcolithic from about 6,500 years ago, marked by the development of metallurgy, leading up to the Bronze Age and Iron Age. In Northern Europe, the Neolithic lasted until about 1700 BC, while in China it extended until 1200 BC. Other parts of the world remained broadly in the Neolithic stage of development until European contact.


Uses of quern-stones

An old Gaelic proverb is "The quern performs best when the grindstone has been pitted." [3]

Design of quern-stones

The upper stones were usually concave whilst the lower was convex. Quern-stones are frequently identifiable by their grooved working surfaces which enabled the movement of flour. Sometimes a millrind was present as a piece of wood (or other material), which allowed the cereal etc to be added but still acted as a centering device. The upper stone sometimes had a cup-shaped area around the hopper hole with a raised edge. [4] Most handstones have a handle hole on the upper surface, however one class of quern-stones have a slot handle which indicates that a piece of wood was placed horizontally and protruded out from the edge so that the operator could turn the stone by standing and using a rod vertically. [5] One class of upper quern-stones has from two to three sockets for the rod used to turn them and this is thought to reflect the need to reduce wear and tear by having alternative points of contact when in active use. [6]


A millrind or simply rind is an iron support, usually four-armed or cross-shaped, for the upper ("runner") stone in a pair of millstones.


Revolving beehive quern-stones and [lower] a saddlestone on display at Cliffe Castle Museum, Keighley. Cliffecastlemus 016.jpg
Revolving beehive quern-stones and [lower] a saddlestone on display at Cliffe Castle Museum, Keighley.

Quern-stones have been used by numerous civilizations throughout the world to grind materials, the most important of which was usually grain to make flour for bread-making. They were generally replaced by millstones once mechanised forms of milling appeared, particularly the water mill and the windmill, although animals were also used to operate the millstones. However, in many non-Westernised, non-mechanised cultures they are still manufactured and used regularly and have only been replaced in many parts of the world in the last century or so.

Cereal Grass of which the fruits are used as grain, or said fruits

A cereal is any grass cultivated (grown) for the edible components of its grain, composed of the endosperm, germ, and bran. The term may also refer to the resulting grain itself. Cereal grain crops are grown in greater quantities and provide more food energy worldwide than any other type of crop and are therefore staple crops. Edible grains from other plant families, such as buckwheat (Polygonaceae), quinoa (Amaranthaceae) and chia (Lamiaceae), are referred to as pseudocereals.

Flour powder which is made by grinding cereal grains

Flour is a powder made by grinding raw grains, roots, beans, nuts, or seeds. It is used to make many different foods. Cereal flour is the main ingredient of bread, which is a staple food for most cultures. Wheat flour is one of the most important ingredients in Oceanic, European, South American, North American, Middle Eastern, North Indian and North African cultures, and is the defining ingredient in their styles of breads and pastries.

Bread Staple food prepared from a dough

Bread is a staple food prepared from a dough of flour and water, usually by baking. Throughout recorded history it has been a prominent food in large parts of the world and is one of the oldest man-made foods, having been of significant importance since the dawn of agriculture.

In early Maya civilizations the process of nixtamalization was distinctive in that hard, ripe kernels of maize (corn) were boiled in water and lime, thus producing nixtamal which was then made into unleavened dough for flat cakes by grinding with a handstone on a quern (metate). [7]

Maya civilization Mesoamerican former civilization

The Maya civilization was a Mesoamerican civilization developed by the Maya peoples, and noted for its logosyllabic script—the most sophisticated and highly developed writing system in pre-Columbian Americas—as well as for its art, architecture, mathematics, calendar, and astronomical system. The Maya civilization developed in an area that encompasses southeastern Mexico, all of Guatemala and Belize, and the western portions of Honduras and El Salvador. This region consists of the northern lowlands encompassing the Yucatán Peninsula, and the highlands of the Sierra Madre, running from the Mexican state of Chiapas, across southern Guatemala and onwards into El Salvador, and the southern lowlands of the Pacific littoral plain.

Nixtamalization process of preparing corn to eat

Nixtamalization is a process for the preparation of maize (corn), or other grain, in which the corn is soaked and cooked in an alkaline solution, usually limewater, washed, and then hulled. This process is known to remove up to 97–100% of aflatoxins from mycotoxin-contaminated corn. The term can also refer to the removal via an alkali process of the pericarp from other grains such as sorghum.

Quern stones were used in China at least 10,000 years ago to grind wheat into flour. The production of flour by rubbing wheat by hand took several hours. [8] Due to their form, dimensions, and the nature of the treatment of the surfaces, they reproduce precisely the most ancient implements used for grinding cereal grain into flour. Saddle querns were known in China during the Neolithic Age but rotary stone mills did not appear until the Warring States Period. [9] A prehistoric quern dating back to 23,000 BCE was found at the Longwangchan archaeological site, in Hukou, Shaanxi in 2007. The site is located in the heartland of the northern Chinese loess plateau near the Yellow River. [10]

China Country in East Asia

China, officially the People's Republic of China (PRC), is a country in East Asia and the world's most populous country, with a population of around 1.404 billion. Covering approximately 9,600,000 square kilometers (3,700,000 sq mi), it is the third or fourth largest country by total area. Governed by the Communist Party of China, the state exercises jurisdiction over 22 provinces, five autonomous regions, four direct-controlled municipalities, and the special administrative regions of Hong Kong and Macau.

Other materials

As well as grain, ethnographic evidence and Mesopotamian texts show that a wide range of foodstuffs and inorganic materials were processed using stone querns or mortars, including nuts, seeds, fruit, vegetables, herbs, spices, meat, bark, pigments, temper and clay. [11] Moreover, one study analysing quern-stones noted that a number of querns had traces of arsenic and bismuth, unlike their source rocks, and had levels of antimony which were ten times higher than those of the rocks. The authors concluded that this was probably due to the use of these querns in the preparation of medicines, cosmetics, dyes or even in the manufacture of alloys. [12]

Querns were widely used in grinding metals ores after mining extraction. The aim was to liberate fine ore particles which could then be separated by washing for example, prior to smelting. They were thus widely used in gold mining in antiquity.

In the Shetlands tobacco was not smoked when first introduced, but instead was ground up into snuff, and inhaled up the nose. Snuff-querns consisted of an upper and lower stone, fixed together by a central iron pivot. The quern was held on the user's lap, the eye of the quern was filled with dried tobacco leaves, and then the upper-stone was turned using the handle. The friction caused by the turning ground the leaves into a fine powder that built up around the edge of the lower-stone. Many snuff-querns had a small hole or cut made near the edge of the upper-stone, into which a pointed end of a lamb's horn was placed in order to turn the stone; an alternative to using a handle. [13]

Incidental uses

A stack of quern-stones for sale in a market in Haikou, Hainan, China. These quern-stones are only about 30 cm wide. Quern-stones in China small.jpg
A stack of quern-stones for sale in a market in Haikou, Hainan, China. These quern-stones are only about 30 cm wide.

There are, however, more surprising recorded uses of quern-stones. For example, DeBoer, in his review of the traditional gambling games of North American tribes, reports that one of the games involved bouncing a group of split canes off a quern. [14]

Violence is recorded thus in the Old Testament in the Book of Judges (9:53; NRSV): “But a certain woman threw an upper-millstone on Abimelech’s head, and crushed his skull.”

Manufacture of quern-stones

The best type of stone from which to manufacture quern-stones are igneous rocks such as basalt. These have naturally rough surfaces, but grains do not detach easily, so the material being ground does not become gritty. However, such rocks are not always available, meaning that quern-stones have been manufactured from a wide variety of rocks, including sandstone, quartzite and limestone. Quernmore Crag near Lancaster in England is named after the quarrying of millstone grit used to make quern stones in these parts.

Rutter was able to show, for the southern Levant, that basalt quern-stones were preferred to those manufactured from other rock types. Basalt quern-stones were therefore transported over long-distances, leading him to argue that, despite their every-day, utilitarian function, they were also used as a status symbol. [15]

Research in Scotland has indicated that to a degree regional styles existed. [16]

Evolution of quern-stones

Knocking stones were used in the preparation of small quantities of cereal however the earliest forms of quern were the saddle and trough querns. The earliest quern so far discovered dates to c. 9,000 BCE and was found at Abu Hureyra, Syria. [2] A later development was the rotary quern, which takes several forms.

Saddle quern

The saddle quern is produced by rocking or rolling the handstone using parallel motions (i.e., pushing and pulling the handstone), which forms a shape looking like a saddle. These are the most ancient and widely used type of quern-stone and were superseded around the 5th to the 4th century BC by the more efficient rotary quern. [17] The handstones for saddle querns are generally either roughly cylindrical (not unlike a rolling pin) and used with both hands, or rough hemispheres and used with one hand. This provides a crushing motion, not a grinding action and is more suitable for crushing malted grain. It is not easy to produce flour from a saddle quern with unmalted grain. The handstone is also referred to as a 'rubber' or 'mouler'. [18]

Rotary hand quern

As the name implies, the rotary quern used circular motions to grind the material, meaning both the quern and the handstone were generally circular. The handstone of a rotary quern is much heavier than that of saddle quern and provides the necessary weight for the grinding of unmalted grain into flour. In some cases the grinding surfaces of the stones fit into each other, the upper stone being slightly concave and the lower one convex.

Rotary Hand Quern at the Estonian Open Air Museum Quern at Estonian Open Air Museum.jpg
Rotary Hand Quern at the Estonian Open Air Museum

Beehive quern

Querns from the Whithorn Museum Quern stones.JPG
Querns from the Whithorn Museum

In this type the upper stone is hemispherical, or bun-shaped, with a central conical hopper to hold the grain that falls down a hole to the grinding surface. It is held in position with a pivot that fits into a central hole in the bottom stone. The upper stone also has a deep horizontal socket in its steep side in which to place the wooden peg used as a handle to rotate or oscillate the upper stone. This was the earliest type of rotary quern to appear in the British Isles. It arrived in Britain in the middle of the Iron Age (about 400-300 BC) and spread into the northern half of Ireland, probably from Scotland, some time after the 2nd century BC. [19]

Disc quern

A hand quern being operated Handquern1.jpg
A hand quern being operated

The adjustable, discoid rotary quern has larger, flatter and more discoid stones than the beehive type. The lower stone was completely perforated. The long handle rotated in a shallow socket in the upper surface of the upper stone. They are thought to have originated in Spain 2,500 years ago [21] and appear to have arrived in maritime Scotland from about 200 BC with people who built the defensive homes known as brochs. This Iron Age type closely resembles the adjustable Highland quern still in use in historic times. [22]

The quern rests on the earasaid of the woman on the right, possibly to catch grain; she feeds the stone with grain from the bowl at her left. Woodcut from Thomas Pennant's 1772 book A Tour in Scotland. Girl with ponytail-Women at the Quern.jpg
The quern rests on the earasaid of the woman on the right, possibly to catch grain; she feeds the stone with grain from the bowl at her left. Woodcut from Thomas Pennant's 1772 book A Tour in Scotland.

Garnett in his 1800 tour of Scotland describes the use of a hand quern as follows: "The quern consists of two circular pieces of stone, generally grit or granite, about twenty inches in diameter. In the lower stone is a wooden peg, rounded at the top; on this the upper stone is nicely balanced, so as just to touch the lower one, by means of a piece of wood fixed in a large hole in this upper piece, but which does not fill the hole, room for feeding the mill being left on each side: it is so nicely balanced, that though there is some friction from the contact of the two stones, yet a very small momentum will make it revolve several times, when it has no corn in it. The corn being dried, two women sit down on the ground, having the quern between them; the one feeds it, while the other turns it round, relieving each other occasionally, and singing some Celtic songs all the time." [20]

Miniature quern

Under 200 mm (7.9 in) in diameter and varying from roughly dressed to carefully worked, often with vertical handle sockets, a new class of querns has been identified having been overlooked in the past as weights, etc. In all respects they are like full sized quern stones and they show the typical wear signs that indicate that they were used for grinding small amounts of seeds, minerals or herbs. A suggestion that they may have been made as toys is thought to be unlikely. [23]

Other types of quern stones

Other forms of quern-stone include hopper-rubbers and Pompeian mills, both used by the Romans. The larger rotary mills were usually worked by a donkey or horse via an extension arm of wood attached to the upper stone.

Sound of a Roman mill.

Laws against use

There was a legal requirement in Scotland for tenants to pay for use of the baron's mill. Early leases of mills gave to the miller the legal right to break quern-stones which were being used in defiance of thirlage agreements. [24]

The obligations of thirlage eventually ceased to apply, but thirlage in Scotland was only formally and totally abolished on 28 November (Martinmas) 2004 by the Abolition of Feudal Tenure etc. (Scotland) Act 2000. [25]

Similar requirements existed and were enforced actively in England. [26]

Ornament and inscription

A number of handstones have been found with extra carving however it is not always straightforward to separate decoration from practical functional purposes. The designs invest in the appearance of the handstone when it is in circular motion and the ability of the quern-stones to change seeds into flour may invoke a feeling of transformative magic that attracted both reverence and status to these household objects. [27] Three beehive querns found in Ireland have inscribed ornament of La Tène type, [19] as do examples from England and Wales. [28] Many of the horizontal slot-handled quern-stones have decoration that usually follows the basic pattern of motifs that encircle the hopper and/or the handle slot. One type though has an irregular pattern of cup marks that encircle the hopper. [1]

A quern was discovered at Dunadd in Scotland which has a cross carved into the upper stone. The cross has expanded terminals and ultimately derives its form from Roman and Byzantine predecessors of the fifth and sixth centuries. This example has a high quality of finishing which reflects its 'cost' and enhances its symbolic value and social significance. The cross is likely to have 'protected' the corn and the resultant flour from evil, such as fungal rust or ergot. Various legends give miraculous power to mill-stones and several have been found which have been re-used in the construction of burial cists or as tomb stones. The association between quern stones and burial may be because they are used in the process of making bread, the staple of life. A broken or disused quern therefore can be seen as symbolic of death. [29] In Clonmacnoise, near Athlone in County Offaly in Ireland, a quern stone was found which had been made into a tombstone, having been ornamented and the name Sechnasach, who died in 928 AD, inscribed onto it. [30] A large quern was discovered on the Lough Scur crannog in Ireland.

The Wondrous Mauchline Quern

In the 9th century the Welsh monk Nennius wrote a history of Britain, the Historia Brittonum , in which he lists the thirteen wonders of Britain, and included in it is the wondrous 'Mauchline Quern' that ground constantly, except on Sundays. It could be heard working underground and the local placename 'Auchenbrain' may celebrate it, translating from the Gaelic as 'field of the quern. [31]

See also


  1. 1 2 McLaren D, Hunter F (2008). "New aspects of rotary querns in Scotland". Proc Soc Antiq Scot. 113: 106. ISSN   0081-1564.CS1 maint: uses authors parameter (link)
  2. 1 2 "Explore/Highlights: Quern stone for making flour". London: The British Museum. Archived from the original on April 21, 2009.
  3. Burnet, Graeme Macrae (2015). His Bloody Project (First ed.). Glasgow: Contraband. p. II. ISBN   9781910192146.
  4. McLaren D, Hunter F (2008). "New aspects of rotary querns in Scotland". Proc Soc Antiq Scot. 138: 106. ISSN   0081-1564.CS1 maint: uses authors parameter (link)
  5. McLaren D, Hunter F (2008). "New aspects of rotary querns in Scotland". Proc Soc Antiq Scot. 138: 112. ISSN   0081-1564.CS1 maint: uses authors parameter (link)
  6. McLaren D, Hunter F (2008). "New aspects of rotary querns in Scotland". Proc Soc Antiq Scot. 115: 106. ISSN   0081-1564.CS1 maint: uses authors parameter (link)
  7. Coe, Michael D. (1999). The Maya (Sixth ed.). New York: Thames & Hudson. p. 13. ISBN   0-500-28066-5.
  8. Greenberger, Robert (2005). The Technology of Ancient China . Rosen Publishing Group. p. 10. ISBN   978-1404205581.
  9. Huang, H.T. (2000). Science and Civilisation in China: Volume 6, Biology and Biological Technology, Part 5, Fermentations and Food Science. 6. Cambridge University Press (published November 30, 2000). p. 463. ISBN   978-0521652704.
  10. Shelach-Lavi, Gideon (2015). The Archaeology of Early China: From Prehistory to the Han Dynasty. Cambridge University Press (published January 26, 2015). p. 53. ISBN   978-0521145251.
  11. Wright 1992:87f
  12. Lease et al. 2001:235
  13. Snuff Quern. Accessed | 2009-11-20
  14. DeBoer 2001:223.
  15. Rutter, Graham (2003). Basaltic-rock procurement systems in the southern Levant. PhD thesis, University of Durham. p. 236. Retrieved 12 March 2014.
  16. McLaren D, Hunter F (2008). "New aspects of rotary querns in Scotland". Proc Soc Antiq Scot. 138: 122–125. ISSN   0081-1564.CS1 maint: uses authors parameter (link)
  17. McLaren D, Hunter F (2008). "New aspects of rotary querns in Scotland". Proc Soc Antiq Scot. 138: 105. ISSN   0081-1564.CS1 maint: uses authors parameter (link)
  18. MacSween, A & Sharp, M (1989), Prehistoric Scotland. London : B.T.Batsford. ISBN   0-7134-6173-X. p. 17.
  19. 1 2 J.T. Koch, An Atlas for Celtic Studies (2007), p. 150.
  20. 1 2 Garnett, T. Observations on a Tour through the Highlands and part of the Western Isles of Scotland, particularly Staff and Icolmkill. Pub. T. Cadell. The Strand. P. 155.
  21. Ritti, Grewe & Kessener 2007 , p. 159
  22. E.W. MacKie, The broch cultures of Atlantic Scotland: origins, high noon and decline: part 2: The Middle Iron Age: high noon and decline c.200 BC – AD 550, Oxford Journal of Archaeology, vol. 29, no 1. (2010), pp. 89-117 (100).
  23. McLaren D, Hunter F (2008). "New aspects of rotary querns in Scotland". Proc Soc Antiq Scot. 138: 119–122. ISSN   0081-1564.CS1 maint: uses authors parameter (link)
  24. Enid Gauldie, The Scottish Miller 1700–1900(John Donald 1981), ISBN   0-85976-067-7.
  25. Querns and millstones Archived September 17, 2008, at the Wayback Machine
  26. McLaren D, Hunter F (2008). "New aspects of rotary querns in Scotland". Proc Soc Antiq Scot. 119: 106. ISSN   0081-1564.CS1 maint: uses authors parameter (link)
  27. McLaren D, Hunter F (2008). "New aspects of rotary querns in Scotland". Proc Soc Antiq Scot. 113: 117. ISSN   0081-1564.CS1 maint: uses authors parameter (link)
  28. Ewan Campbell, A cross-marked quern from Dunadd and other evidence for relations between Dunass and Iona, Proceedings of the Society of Antiquaries of Scotland, vol. 5, no. 117 (1987), pp. 105 - 117.
  29. Janet and Colin Bord, Mysterious Britain (Garnstone 1973), ISBN   0-85511-180-1. P. 62.
  30. Watson, William J. (1926). The History of the Celtic Place-Names of Scotland. Edinburgh : William Blackwood & Sons Ltd., p.187


Related Research Articles

Watermill structure that uses a water wheel or turbine to drive a mechanical process

A watermill or water mill is a mill that uses hydropower. It is a structure that uses a water wheel or water turbine to drive a mechanical process such as milling (grinding), rolling, or hammering. Such processes are needed in the production of many material goods, including flour, lumber, paper, textiles, and many metal products. These watermills may comprise gristmills, sawmills, paper mills, textile mills, hammermills, trip hammering mills, rolling mills, wire drawing mills.

Millstone stones used in gristmills, for grinding wheat

Millstones or mill stones are stones used in gristmills, for grinding wheat or other grains.

Miller person who produces flour or other products by operating a mill

A miller is a person who operates a mill, a machine to grind a grain to make flour. Milling is among the oldest of human occupations. "Miller", "Milne", and other variants are common surnames, as are their equivalents in other languages around the world. Milling existed in hunter-gatherer communities, and later millers were important to the development of agriculture.

Watsons Mill watermill in Ottara

Watson's Mill is an historic flour and gristmill in Manotick, Ontario, Canada. It is the only working museum in the Ottawa area and one of the very few operating industrial grist mills in North America. Watson's Mill still sells stone-ground whole wheat flour which is made on site. The mill is also well known for its ghost story. The legend is that Ann Currier, wife of Joseph, haunts the mill, following her death in a tragic accident there in 1861. Watson's Mill is Manotick's most recognized landmark. Its image is used as a symbol for the village.

Dun Carloway

Dun Carloway is a broch situated in the district of Carloway, on the west coast of the Isle of Lewis, Scotland. It is a remarkably well preserved broch - on the east side parts of the old wall still reach to 9 metres tall.

Dalgarven Mill – Museum of Ayrshire Country Life and Costume

Dalgarven Mill is near Kilwinning, in the Garnock Valley, North Ayrshire, Scotland and it is home to the Museum of Ayrshire Country Life and Costume. The watermill has been completely restored over a number of years and is run by the independent Dalgarven Mill Trust.

Greens Mill, Sneinton grade II listed mill in the United kingdom

Green’s Windmill is a restored and working 19th century tower windmill in Sneinton, Nottingham. Built in the early 1800s for the milling of wheat into flour, it remained in use until the 1860s. It was renovated in the 1980s and is now part of a science centre, which together have become a local tourist attraction.

Ballycopeland Windmill windmill

Ballycopeland Windmill is a functioning windmill located one mile west of Millisle, County Down, Northern Ireland. It is managed by The Historic Environment Division of The Department for Communities and is open to the public. It is known in Irish as Muileann gaoithe Bhaile Chóplainn and in Ulster-Scots as Ballycopelann Wun-mäll.

Carved stone balls petrospheres dating from the late Neolithic to the Iron Age, mainly found in and around Scotland

Carved stone balls are petrospheres dated from the late Neolithic to possibly as late as the Iron Age mainly found in Scotland, but also elsewhere in Britain and Ireland. They are usually round and rarely oval, and of fairly uniform size at around 2.75 inches or 7 cm across, with 3 to 160 protruding knobs on the surface. They range from having no ornamentation to extensive and highly varied engraved patterns. A wide range of theories have been produced to explain their use or significance, with none gaining very wide acceptance.

Thirlage was a feudal servitude under Scots law restricting manorial tenants in the milling of their grain for personal or other uses. Vassals in a feudal barony were thirled to their local mill owned by the feudal superior. People so thirled were called suckeners and were obliged to pay customary dues for use of the mill and help maintain it.

Bobs Red Mill

Bob's Red Mill is a brand of whole-grain foods marketed by employee-owned American company Bob's Red Mill Natural Foods of Milwaukie, Oregon. The company was established in 1978 by Bob and Charlee Moore.

Gristmill mill; grinds grain into flour

A gristmill grinds cereal grain into flour and middlings. The term can refer to both the grinding mechanism and the building that holds it.

John Barry Mercer was a British archaeologist, author and weaver.

Newton Stone

The Newton Stone is a pillar stone, found in Aberdeenshire, Scotland. The stone contains two inscriptions: one is written in Ogham, but the second script has never been positively identified and many different decipherments or theories have been proposed since the 1860s.

Euan Wallace MacKie is a British archaeologist and anthropologist. He is a prominent figure in the field of Archaeoastronomy.

De Hoop, Ouddorp

De Hoop ("Hope") is a flour windmill in Ouddorp built in 1845 and fully renovated in 1984. It is one of the few windmills in the Netherlands that is still privately owned, and is still in full commercial operation.

Carew Tidal Mill Grade II* listed building in Pembrokeshire. Tide mill in Pembrokeshire, United Kingdom

Carew Tidal Mill, also called the French Mill, is a corn mill in Pembrokeshire, Wales, powered by tidal water. It was built around 1801 just west of Carew Castle, and replaced a much older mill in the same location. The mill pond fills through open flood gates as the tide comes in. The gates are closed at high tide, and the pond drains through sluices under the mill as the tide falls, driving two undershot water wheels. It is the only intact mill of this type in Wales. It was abandoned in 1937, was restored in 1972, and now houses a museum.

Knocking stone

Knocking stones,Knockin'-stanes or Clach chnotainn in Scottish Gaelic were exposed bedrock stone or boulders with a pot-shaped concavity cut into them used for husking barley and other cereals before the introduction of other methods of milling grain or when only small quantities of cereal were processed.

St Peters Well, Houston

St Peter's Well is a rare surviving example of a holy well house or covered well that was built over the waters of a spring in a field below Greenhill Farm, located off Chapel Road near Houston in Renfrewshire, parish of Houston and Kilellan, south-west Scotland.

Mo were stone implements used for grinding wheat in ancient China. It was a rotary quern millstone powered by a hand operated crank fixed at the top to grind and pulverize grains, wheat, and rice into flour.