Akademik

jack ladder
noun
(nautical) a hanging ladder of ropes or chains supporting wooden or metal rungs or steps
Syn: ↑Jacob's ladder, ↑pilot ladder
Topics: ↑seafaring, ↑navigation, ↑sailing
Hypernyms: ↑ladder

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noun
1. : a ship's ladder with wooden rungs and side ropes
2.
a. : an inclined plane up which logs are moved from pond to sawmill typically consisting of a V-shaped trough within which an endless chain carries the logs upward
b. : jack chain

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1. Naut. See Jacob's ladder (def. 2a).
2. Lumbering. See bull chain.
[1885-90]

Useful english dictionary. 2012.