jack chainn.
/ˈdʒak tʃeɪn/, U.S. /ˈdʒæk ˌtʃeɪn/ 1. A chain in which each link consists of a double loop so as to resemble a figure of eight, but with the loops at right angles to each other.
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society > occupation and work > equipment > building and constructing equipment > fastenings > [noun] > chain > types of
jack chain1639
safety chain1845
1639 W. Cartwright Royall Slave i. ii. sig. B4 If you'l make use of any Ornaments, I've a couple of Jack-chaynes at your service.
1677 W. Wycherley Plain-dealer i. 7 Here you see..a Scrivener with a Jack-chain about his neck.
1708 tr. A. R. Le Sage Le Diable Boiteux viii. 107 I wrap my self up in a long black Cloak, and hang the Jack-Chain about my Neck.
1765 O. Goldsmith Ess. iv. 23 The president ordered up the jack-chain, and, instead of a crown, our performer covered his brows with an inverted jordan.
1860 A. Smith Wild Oats & Dead Leaves xi. 117 The same horses whinnied, and fought, and rattled the bits of jack-chain and remnants of box-cord that formed the harness.
1892 Pall Mall Gaz. 23 Sept. 6/2 Much stronger than ordinary welded or jack chains.
1936 Pop. Mech. July 51/2 The top cap of the post has a hole through which a jack chain is run.
1953 Financial Times 8 Dec. 5/7 (advt.) There are Heenan machines for producing short-link industrial chain, knotted chain, mattress chain and jack chain.
2013 Penrith (Austral.) Press (Nexis) 29 Oct. 25 Prise a link in the jack chain open and insert through the hole.
2. A machine used for conveying logs to the floor of a sawmill, in which the logs are carried by a continuous chain having spikes, hooks, etc., along its length.
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the world > food and drink > farming > forestry or arboriculture > lumbering > [noun] > lumbering equipment > chain for moving logs
timber-chain1707
jack ladder1871
jack chain1878
1878 Specif. & Drawings of Patents (U.S. Patent Office) 20 Aug. 648/1 Figure 1 is a side view of a portion of a slip, with the jack-chain and shoe, upon which rests a log.
1905 Terms Forestry & Logging (Bull. U.S. Dept. Agric., Bureau Forestry, No. 61) 40 Jack chain, an endless spiked chain, which moves logs from one point to another, usually from the mill pond into the sawmill.
1922 R. C. Bryant Lumber iii. 22 (caption) Two Types of Jack Chains and Log Dogs used in elevating Logs from Water Storage to the Sawing Floor of a Sawmill.
2008 C. Fregulia Logging in Central Sierra 107 Logs were pulled up the jack chain from the dry deck.., placed on the log carriage, and passed through two circular saws blades.
This entry has been updated (OED Third Edition, March 2018; most recently modified version published online June 2022).
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