DICTIONARY OF

Jib of Jibs 186 Julian Calendar
.Jib of Jibs. Outermost jibsail when three or more are carried.
Jib Outhaul. Rope by which a jib tack is hauled out to jib boom when setting jibsail.
Jib Sheet. Rope by which clew of a jib is controlled.
Jib Stay. Stay to which luff of a jib is confined.
Jigger. General purpose tackle consisting of single and double blocks, with standing part
spliced to arse of single block. 2. After trysail of a four-masted barquentine. 3. After mast of
a four-masted vessel.
Jimmy Bungs. Nickname for a ship's cooper.
Jimmy Duck's. Nickname for a ship's poulterer.
Jimmy Green. Square sail set beneath bowsprit in later clipper ships.
Jockeying. Manoeuvring a yacht, in vicinity of starting line, with a view to getting a
favourable position and a flying start.
Joggled Frame. Steel or iron frame having alternate raised and recessed portions - on outer
edge - that are of same dimensions as depth and thickness of ship's side plating. Allows
plating to rest closely on frame and lap over plates above and below, without joggling plate
edges.
Joggled Plate. Ship side plating so shaped that longitudinal edge of plate curves and
overlaps plate next above or below it; the rest of the plate resting closely on the frame.
Joggled Timber. Frame, of a wooden vessel, so shaped that an attached strake has a clincher
appearance, although there is no overlap or doubling.
Joggle Shackle. Elongated and slightly bent shackle that can confine a link of chain cable.
Has a quick-release pin.
John Dory. Dory, the fish.
Joining Shackle. Flush shackle joining two lengths of cable.
Jolly. Nickname for a Royal Marine.
Jolly Boat. General purpose boat of a ship. In R.N. was usually a 28-ft. double-banked boat
pulling ten oars.
Jolly Jumper. Square sail set above a 'moonraker'. Was rarely carried.
Jolly Roger. Skull and crossbones flag of a pirate.
Jonah, Jonas. Person whose presence on board is coincident with misfortune.
Joule's Equivalent of Heat. Expresses the relationship between heat energy and mechanical
work as 778 - foot pounds; being equal to heat required to raise one pound of water through
one degree Fahrenheit. The British Thermal Unit assumes 762 - foot pounds.
Journal. Old name for a log book. 2. Book entered with day by day recordings.
Judas. Said of any yarn or rope end that hangs down and is at the mercy of the wind.
Julian Calendar. Devised by Sosigenes and inaugurated by Julius Caesar. Assumes a year
to be exactly 365 1/4 days. Commonly used until 1582.