a chain having open links in the form of a figure 8, with one loop at right angles to the other.
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How to use jack chain in a sentence
"O yes," Mrs. Bungay said, thinking he spoke of a jack-chain very likely.The History of Pendennis | William Makepeace Thackeray
"O, yes," Mrs. Bungay said, thinking he spoke of a jack-chain very likely.A History of Pendennis, Volume 1 | William Makepeace Thackeray
By means of skids, a stone-sled, a jack-chain and much audible exertion, the tree was finally started on its journey.The Mayflower, January, 1905 | Various