merly called gearnsey, ganzee, or
guernsey.--_Jersey frocks_, woollen frocks supplied to seamen.

JETSAM, OR JETSON. In legal parlance, is the place where goods thrown
overboard sink, and remain under water. Also, the goods cast into the
sea.

JETTISON, OR JETSEN. The act of throwing goods overboard to lighten a
ship in stress of weather. The loss forms a subject for general average.

JETTY, JETTEE, OR JUTTY. A name given in the royal dockyards to that
part of a wharf which projects beyond the rest, but more particularly
the front of a wharf, the side of which forms one of the cheeks of a dry
or wet dock. Such a projection, whether of wood or stone, from the outer
end of a wharf, is called a _jetty-head_.

JEW-BALANCE. A Mediterranean name of the _Zygaena malleus_, or
hammer-headed shark.

JEWEL. The starting of a wooden bridge. Also, the pivot of a
watch-wheel.

JEWEL-BLOCKS. Are attached to eye-bolts on those yards where
studding-sails are hoisted, and carry these sails to the extreme ends of
the yards. When these jewel-blocks are removed, it is understood that
there is no intention to proceed to sea, and _vice versa_. The
halliards, by which the studding-sails are hoisted, are passed through
the jewel-block, whence, communicating with a block on the several
mast-heads, they lead downwards to the top or decks, where they may be
conveniently hoisted. (_See_ SAIL.)

JEWELS. _See_ JOCALIA.

JEW'S-HARP. The shackle for joining a chain-cable to the anchor-ring.

JIB. A large triangular sail, set on a stay, forward. It extends from
the outer end of the jib-boom towards the fore top-mast head; in cutters
and sloops it is on the bowsprit, and extends towards the lower
mast-head. (_See_ SAIL.) The jib is a sail of great command with any
side wind, in turning her head to leeward. There are other jibs, as
inner jib, standing-jib, flying-jib, spindle-jib, jib of jibs,
jib-topsails, &c.--_Jib_ is also used for the expression of the face, as
the _cut of his jib_. Also, the arm of a crane.--_To jib_, is when,
before the wind, the sail takes over to the opposite quarter; dangerous
in strong breezes. (_See_ GYBING.)--_Clear away the jib!_ The order to
loose it, preparatory to its being set.--_Flying-jib._ A sail set upon
the flying jib-boom.--_Middle or inner jib._ A sail sometimes set on a
stay secured to the middle of the jib-boom.

JIB AND STAYSAIL JACK. A designation of inexperienced officers, who are
troublesome to t