Jack chain

A jack chain is a type of chain made of thin wire, with figure-eight-shaped links, and loops at right angles to each other. Jack chains are often used to suspend fixtures such as lights or signs, for decorative purposes, or as part of a cable lock.[1]

Two lengths of single-jack chain
Two links of double-jack chain

Jack chain may be manufactured as either single-jack chain or as double-jack chain. If double-jack, the lower loop is formed of two strands of wire rather than just one as in a single-jack.

Before the days of lavatory cisterns being close to the pan, jack chains were often used to release the cistern plug.

Other meanings of "jack chain"

A jack chain is a tool attached to a toothed chain for moving logs.[2]

A jack chain is a form of arm protection for the 15th century infantry soldier who typically was not dressed in plate armor but wore a padded arming jacket (“jack”) to protect his upper body.[3][4]

gollark: It would definitely be nice to have some sort of keyboard option though.
gollark: What could possibly work is some sort of USB-C clip on keyboard, but that might be a bit hard to hold.
gollark: I think it's more likely to end up remaining very niche.
gollark: I don't need anything else out of a phone, and am tired of the inability to even change DNS servers on Android, so it seems pretty cool.
gollark: It's a shame it doesn't have a physical keyboard, but for "relatively open thing which can browse the interweb and send SMS/make calls" it does seem pretty good.

References
  1. "Jack Chains". Halebros.com. Retrieved 2013-11-02.
  2. "jack chain: Definition from". Answers.com. Retrieved 2013-11-02.
  3. "Image" (PDF). Historiclife.com. Retrieved 2013-11-02.
  4. "Jacks" (PDF). Historiclife.com. Retrieved 2012-02-14.


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