Chain

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Lighterstill.jpg
The Great Chain of Being.jpg

Origin

Middle English cheyne, from Anglo-French chaene, from Latin catena

Definitions

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)
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 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 sprockets of the machine, and are flexible in only one dimension. They are known as Roller chains, though there are also non-roller chains such as block chain.

Two distinct chains can be connected using a quick link which resembles a carabiner with a screw close rather than a latch. [1]