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THWART —Plank set athwartships just below
the gunwales in an open boat; acts as a seat and
provides support to the sides.
TOPSIDE —Generally refers to weather
decks.
TRANSVERSE FRAME —Structural member
that extends outward from the keel and upward
to the main deck.
TRICE UP —To secure bunks by hauling them
up and hanging them off (securing them) on their
chains.
TRUNK —The uppermost tip of a mast.
TURNBUCKLE —Device for setting up a
tension, as in a lifeline, by turning a buckle into
which two eyebolts are threaded.
TURN OF THE BILGE —Where the side
meets the bottom.
TURN IN —(1) Retire to bed. (2) Return
articles to the issue room.
TURN OUT —(1) Get out of bed. (2) Order
out a working party or other groups, as to turn
out the guard.
TURN TO —Start working.
UP ALL LATE BUNKS —An order to per-
sonnel entitled to sleep after reveille to get up.
UPPER DECK —The first deck above the
main deck.
VEER —(1) To allow a line, wire, or chain to
run out by its own weight. (2) To swerve. (3) Act
of the wind in changing direction clockwise.
VOID —An empty tank.
WAIST —The amidships section of the main
deck.
WAKE —Trail left by a vessel, or other
object, moving through the water.
WARDROOM —Officers’ messing compart-
ment.
WATCH —(1) One of the periods (usually
4 hours) into which a day is divided. (2) A
particular duty, as lifebuoy watch. (3) The act of
a buoy or other marker in indicating the position
of a sunken object.
WATERTIGHT INTEGRITY —A ship’s degree
of resistance to flooding.
WAY —(1) Horizontal motion of a floating
body. (2) Launching track in a shipbuilding yard.
WEATHER DECK —Any deck exposed to the
elements.
WET DOCK —A basin formed, by the con-
struction of barriers with gates, in a harbor
of great tidal ranges to prevent ships from
being stranded during low tides. Ships enter
the basin at high tide, the gates are closed,
and the water is retained in the basin when the
tide ebbs.
WHARF —Similar to a quay, but constructed
in the fashion of a pier.
WHIPPING —Binding on the end of a line or
wire to prevent unraveling.
WILDCAT —That portion of a windlass
which engages the links of the anchor chain so
that the anchor can be heaved in.
WINDWARD —Toward the direction from
which the wind is blowing.
YARD —Spar set athwartships across the
upper part of a mast.
YARDARM —The port or starboard half of
the horizontal crosspiece of the mast that is either
the port or starboard yardarm.
YAW —The act of a vessel when its heading
is thrown wide of its course by a force from
astern, such as a heavy following sea.
AI-15
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