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jack crosstree

 
Jack "Jack", n. [F. Jacques James, L. Jacobus, Gr. ?, Heb. Ya 'aq[=o]b Jacob; prop., seizing by the heel; hence, a supplanter. Cf. , .] 1. A familiar nickname of, or substitute for, John.
You are John Rugby, and you are Jack Rugby. -Shak.
2. An impertinent or silly fellow; a simpleton; a boor; a clown; also, a servant; a rustic. ``Jack fool.'' -Chaucer.
Since every Jack became a gentleman, There 's many a gentle person made a Jack. -Shak.
3. A popular colloquial name for a sailor; - called also , and .
4. A mechanical contrivance, an auxiliary machine, or a subordinate part of a machine, rendering convenient service, and often supplying the place of a boy or attendant who was commonly called Jack; as: (a) A device to pull off boots. (b) A sawhorse or sawbuck. (c) A machine or contrivance for turning a spit; a smoke jack, or kitchen jack. (b) (Mining) A wooden wedge for separating rocks rent by blasting. (e) (Knitting Machine) A lever for depressing the sinkers which push the loops down on the needles. (f) (Warping Machine) A grating to separate and guide the threads; a heck box. (g) (Spinning) A machine for twisting the sliver as it leaves the carding machine. (h) A compact, portable machine for planing metal. (i) A machine for slicking or pebbling leather. (k) A system of gearing driven by a horse power, for multiplying speed. (l) A hood or other device placed over a chimney or vent pipe, to prevent a back draught. (m) In the harpsichord, an intermediate piece communicating the action of the key to the quill; - called also . (n) In hunting, the pan or frame holding the fuel of the torch used to attract game at night; also, the light itself. -C. Hallock.
5. A portable machine variously constructed, for exerting great pressure, or lifting or moving a heavy body through a small distance. It consists of a lever, screw, rack and pinion, hydraulic press, or any simple combination of mechanical powers, working in a compact pedestal or support and operated by a lever, crank, capstan bar, etc. The name is often given to a jackscrew, which is a kind of jack.
6. The small bowl used as a mark in the game of bowls. -Shak.
Like an uninstructed bowler who thinks to attain the jack by delivering his bowl straight forward upon it. -Sir W. Scott.
7. The male of certain animals, as of the ass.
8. (Zo["o]l.) (a) A young pike; a pickerel. (b) The jurel. (c) A large, California rock fish (); - called also , and {m['e]rou}. (d) The wall-eyed pike.
9. A drinking measure holding half a pint; also, one holding a quarter of a pint. [Prov. Eng.] -Halliwell.
10. (Naut.) (a) A flag, containing only the union, without the fly, usually hoisted on a jack staff at the bowsprit cap; - called also . The American jack is a small blue flag, with a star for each State. (b) A bar of iron athwart ships at a topgallant masthead, to support a royal mast, and give spread to the royal shrouds; - called also . -R. H. Dana, Jr.
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