J

JACK	A common term for the jack-cross-trees . (See UNION.)
JACK-BLOCK	A block used in sending topgallant masts up and down.
JACK-CROSS-TREES	Iron cross-trees at the head of long topgallant masts.
JACK-STAFF	A short staff, raised at the bowsprit cap, upon which the Union Jack is hoisted.
JACK-STAYS	Ropes stretched taut along a yard to bend the head of the sail to. Also, long strips of wood or iron, used now for the same purpose.
JACK-SCREW	A purchase, used for stowing cotton.
JACOB'S LADDER	A ladder made of rope, with wooden steps.
JAWS	The inner ends of booms or gaffs, hollowed in.
JEERS	Tackles for hoisting the lower yards.
JEWEL-BLOCKS	Single blocks at the yard-arms, through which the studdingsail halyards lead.
JIB	A triangular sail set on a stay, forward. Flying jib sets outside of the jib; and the jib-o'-jib outside of that.
JIB-BOOM	The boom, rigged out beyond the bowsprit, to which the tack of the jib is lashed.
JIGGER	A small tackle, used about decks or aloft.
JOLLY-BOAT	A small boat, usually hoisted at the stern.
JUNK	Condemned rope, cut up and used for making mats, swabs, oakum, &c.
JURY-MAST	A temporary mast, rigged at sea, in place of one lost.