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<!-- Deleted image removed: [[Image:TibetanWomen,ButterChurn.jpg|thumb|left|[[Tibet]]an women demonstrating use of the butter tea churn at the [[Field Museum]] {{Pufc|1=TibetanWomen,ButterChurn.jpg|log=2010 January 30}}]] -->[[Image:Leeds butter churn.jpg|thumb|A barrel-type butter churn]]
[[Image:childbutterchurn.jpg|thumb|A typical plunger-type butter churn used by American pioneers]]
A '''butter churn''' is a device used to convert [[cream]] into [[butter]].  This is done through a mechanical process, frequently via a pole inserted through the lid of the churn, or via a crank used to turn a rotating device inside the churn.

==Process==
The agitation of the cream, caused by the mechanical motion of the device, disrupts the [[milk fat]].  The [[Biological membrane|membranes]] that surround the fats are broken down, subsequently forming clumps known as butter grains.  These butter grains, during the process of [[churning (milk)|churning]], fuse with each other and form larger fat globules.  Air bubbles are introduced into these fat globules via the continued mechanical action of the churn.  The butter grains become more dense as fat globules attach to them while the air is forced out of the mixture.  This process creates a liquid known as [[buttermilk]].  With constant churning, the fat globules eventually form solid butter and separate from the buttermilk.  The buttermilk is then drained off and the butter is squeezed to eliminate excess liquid and to form it into a solid mass.

==Etymology==
The word “butter” is believed be derived from the [[Greek language|Greek]] word bou-tyron, the approximate meaning of which is “cowcheese.”  However, some believe the word came from the [[Scythian]] culture, as the [[ancient Greeks]] tended to herd [[sheep]] and [[goats]], whose milk is not as optimal for butter making as cows, which the Scythians primarily herded.<ref>Douma, Michael. Butter through the Ages. 2008. Institute for Dynamic Educational Development.  http://www.webexhibits.org/butter</ref>  The word "churn" is from the [[Old English]] ''ċyrin,'' to churn.  This is probably derived from the Old English ''cyrnel,'' "kernel," due to the appearance of butter grains after milk has been churned.<ref>"churn, n." The Oxford English Dictionary. 2nd ed. 1989. OED Online. Oxford University Press.</ref>

==History==
Evidence for the use of butter dates back as early as 2,000 BC,<ref>Columbia Electronic Encyclopedia, 6th Edition.  2009 pg:1 -1.  “Butter.”</ref> and there is mention of it in [[biblical]] works.  The butter churn itself may have existed as early as the 6th century AD, as can be seen by what appears to be a churn lid dating from that era.<ref>National Museums of Scotland, “Churn Lid.”  http://nms.scran.ac.uk/database/record.php?usi=000-100-103-159-C</ref>
In the European tradition, the butter churn was primarily a device used by women, and the churning of butter was an essential responsibility along with other household chores.<ref>Jensen, Joan M.  What's in a Butter Churn? Objects and Women's Oral History.  1983. http://www.jstor.org/stable/3345974</ref>   In earlier traditions of butter making, [[nomadic]] cultures placed milk in skin bags and produced butter either by shaking the bag manually, or possibly by attaching the bag to a pack animal, and producing butter simply through the movement of the animal.  Some theorists believe this is how the butter creation process was discovered.  Some cultures still use a process similar to this, whereby a bag is filled with milk, tied to a stick, and vigorously shaken.  

==Types of Butter Churns==
The most historically prominent types of butter churns are the plunge churn, which is a container, usually made out of [[wood]], where the butter-making action is created by moving in a vertical motion a staff that is inserted into the top.  This type of churn is also known as an ‘up and down’ churn, churning tub, plunger churn, plumping churn, knocker churn, plump-kirn, or plowt-kirn (where “kirn is a Scots/Northern English word for churn).  The staff used in the churn is known as the dash, dasher-staff, churn-staff, churning-stick, plunger, plumper, or kirn-staff.<ref>“Old and Interesting” http://www.oldandinteresting.com/history-butter-churns.aspx</ref>

Another prominent type of churn was the paddle churn, which was a container that contained a paddle, which was operated by a handle.  The paddle churned the butter inside the container when the handle was turned.

The barrel churn was also used extensively.  This type of churn was a barrel turned onto its side with a crank attached.  The crank either turned a paddle device inside the churn, as in the paddle churn, or turned the whole barrel, whose action converted the milk to butter.  The barrel churn was one of the agricultural innovations of 18th century [[Europe]].<ref>[http://www.soilandhealth.org/03sov/0302hsted/030205ellis/030205butter.cheese.html Ellis: Butter and Cheese, Soil And Health Library]</ref>

One particularly novel invention of note was the [[rocking chair]] butter churn.  This device, invented by Alfred Clark, consisted of a barrel attached to a rocking chair. While the rocking chair moved, the barrel moved and churned the milk within into butter.<ref>Sabin, L.  “What a Wild Idea.”  Boys’ Life, Sep 1990.  80.1, p 32.</ref>


==References==
{{reflist}}

==External links==
{{Commonscat|Butter churns}}
* [http://webexhibits.org/butter/kitchen.html Several types of butter churn illustrated and described]
* [http://www.rousek.eu/images/historie/_cz/historie-firmy-j-rousek-a-synove-v-obdobi-1912-1948-129.jpg Traditional Czech butter churn]
{{Butter}}
[[Category:Cooking utensils]]
[[Category:Butter]]

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