jack chain

noun
1. : a light wire chain whose links are set at right angles to each other resembling a figure eight or having the end of each loop bent round to meet the end of the other loop
2. : an endless toothed chain for moving logs usually from the millpond into the sawmill

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a chain having open links in the form of a figure 8, with one loop at right angles to the other.
[1630-40]

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n. a chain of unwelded links each consisting of a double loop of wire resembling a figure 8, but with the loops in planes at right angles to each other

Useful english dictionary. 2012.

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