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From Nordan Symposia
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[[File:lighterstill.jpg]][[File:The_Great_Chain_of_Being.jpg|right|frame]]
==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] ''cheyne'', from Anglo-French ''chaene'', from [[Latin]] ''catena''
*[http://en.wikipedia.org/wiki/14th_century 14th Century]
==Definitions==
*1a : a [[series]] of usually metal [[links]] or rings [[connected]] to or fitted into one another and used for various [[purposes]] (as [[support]], restraint, transmission of [[mechanical]] [[power]], or measurement)
:b : a series of [[links]] used or worn as an ornament or insignia
:c (1) : a measuring instrument of 100 links used in [[surveying]] (2) : a unit of length [[equal]] to 66 feet (about 20 meters)
*2: something that confines, restrains, or [[secures]]
*3a : a [[series]] of [[things]] linked, [[connected]], or associated together <a chain of [[events]]> <a mountain chain>
:b : a group of [[enterprises]] or [[institutions]] of the same kind or [[function]] usually under a single ownership, [[management]], or [[control]] <fast-food chains>
:c : a [[number]] of [[atoms]] or chemical groups united like links in a chain
==Description==
A '''chain''' is a [[series]] of [[connected]] [[links]] which are typically made of metal. A chain may consist of two or more links.
Chains are usually made in one of two styles, according to their intended use:
*Those [[designed]] for lifting, such as when used with a [http://en.wikipedia.org/wiki/Hoist_(device) hoist]; for pulling; or for securing, such as with a bicycle lock, have links that are torus shaped, which makes the chain flexible in two dimensions (The fixed third dimension being a chain's length.)
*Those designed for [[transferring]] [[power]] in [[machines]] have links designed to mesh with the teeth of the [http://en.wikipedia.org/wiki/Sprocket sprockets] of the machine, and are flexible in only one dimension. They are known as [http://en.wikipedia.org/wiki/Roller_chain Roller chains], though there are also non-roller chains such as [http://en.wikipedia.org/wiki/Block_chain block chain].
Two distinct chains can be [[connected]] using a [http://en.wikipedia.org/wiki/Maillon quick link] which resembles a carabiner with a screw close rather than a latch. [http://en.wikipedia.org/wiki/Chain]
[[Category: General Reference]]
==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] ''cheyne'', from Anglo-French ''chaene'', from [[Latin]] ''catena''
*[http://en.wikipedia.org/wiki/14th_century 14th Century]
==Definitions==
*1a : a [[series]] of usually metal [[links]] or rings [[connected]] to or fitted into one another and used for various [[purposes]] (as [[support]], restraint, transmission of [[mechanical]] [[power]], or measurement)
:b : a series of [[links]] used or worn as an ornament or insignia
:c (1) : a measuring instrument of 100 links used in [[surveying]] (2) : a unit of length [[equal]] to 66 feet (about 20 meters)
*2: something that confines, restrains, or [[secures]]
*3a : a [[series]] of [[things]] linked, [[connected]], or associated together <a chain of [[events]]> <a mountain chain>
:b : a group of [[enterprises]] or [[institutions]] of the same kind or [[function]] usually under a single ownership, [[management]], or [[control]] <fast-food chains>
:c : a [[number]] of [[atoms]] or chemical groups united like links in a chain
==Description==
A '''chain''' is a [[series]] of [[connected]] [[links]] which are typically made of metal. A chain may consist of two or more links.
Chains are usually made in one of two styles, according to their intended use:
*Those [[designed]] for lifting, such as when used with a [http://en.wikipedia.org/wiki/Hoist_(device) hoist]; for pulling; or for securing, such as with a bicycle lock, have links that are torus shaped, which makes the chain flexible in two dimensions (The fixed third dimension being a chain's length.)
*Those designed for [[transferring]] [[power]] in [[machines]] have links designed to mesh with the teeth of the [http://en.wikipedia.org/wiki/Sprocket sprockets] of the machine, and are flexible in only one dimension. They are known as [http://en.wikipedia.org/wiki/Roller_chain Roller chains], though there are also non-roller chains such as [http://en.wikipedia.org/wiki/Block_chain block chain].
Two distinct chains can be [[connected]] using a [http://en.wikipedia.org/wiki/Maillon quick link] which resembles a carabiner with a screw close rather than a latch. [http://en.wikipedia.org/wiki/Chain]
[[Category: General Reference]]
