TABERNACLE - Not a French swear word… A box like support in which the foot of the mast pivots to facilitate lowering.

TABLING - The folded hem sewn to the edges of a sail to reinforce them.

TACK - The lower  forward corner of the sail

TACKING - Change tack by putting bow through wind.

TAKING WAY OFF - Reducing speed.

TAFFRAIL LOG - A propeller drawn through the water that operates an meter on the boat registering the speed and distance sailed

TANG - Metal fitting on top of mast to attach shrouds or stays.

TAR – A sailor

TEEM - To pour. To empty.

TELLTALES - Short lengths of wool indicating wind direction.

TENDER – 1. A small boat used to transport crew and equipment from shore to a larger boat. 2. Of a boat, to right itself slowly, a slow period of roll, and little early stability

TENTH WAVE - Commonly believed to be higher than preceding nine waves. Although it is true that wind effect causes one wave to override another, and so make a larger wave, it is not established that the eleventh wave will do this; so making a larger tenth wave. In some places the fifth wave is consistently larger.

THOLE, THOLE PIN - Metal or wooden peg inserted in gunwale of a boat for oar to heave against when rowing without crutch or rowlock.

THREE SHEETS IN THE WIND - Said of a man under the influence of drink. A ship with three sheets in the wind would "stagger to and fro like a drunken man". Conversely, a drunken man staggers to and fro like a ship with three sheets in the wind.

THWARTSHIPS - At right angles to the centerline of the boat

TIDAL CURRENT – Current due to tidal action

TIDAL RIP – A confused, tumbling surface condition, caused by tidal currents

TIDE - The periodic rise and fall of water level in the oceans.

TILLER - A bar or handle for turning a boat's rudder or an outboard motor.

TOE RAIL - Small rail around the deck of a boat. The toe rail may have holes in it to attach lines or blocks. A larger wall is known as a gunwale.

TOM COX'S TRAVERSE - Work done by a man who bustles about doing nothing. Usually amplified by adding "running twice round the scuttle butt and once round the longboat".

TOPMAST  - a second spar carried at the top of the fore or main mast,used to fly more sail.

TOPPING LIFT - A line or wire for lifting the boom

TOP SAIL - A sail set above the gaff

TOPSAIL SCHOONER - A schooner with a square rigged sail on forward mast

TOPSIDES - The sides of a vessel between the waterline and the deck; sometimes referring to onto or above the deck.

TRACK – 1. A boat’s intended path over the Earth’s surface. 2. A fitting on spars to accept sail slides or bolt rope

TRANSIT - The time steaming from port to the study site and vice versa.

TRANSOM - The stern cross-section of a square sterned boat.

TRAVELER - A device that the mainsheet may be attached to which allows its position to be adjusted.

TRICE - To haul up by pulling downwards on a rope that is led through a block or sheave.

TRICK – The period of time during which the steersman remains at the wheel

TRIM – 1. The set of a sail. 2. The fore-and-aft or athwartships attitude of a vessel, with respect to the waterline. 3. To adjust the set of the sails. 4. To alter the fore-and-aft or athwartships balance of the vessel.

TRIMARAN – A boat with three hulls joined with a common deck.

TROUGH – The hollow between two waves

TRUCK – A cap fitting over the head of a mast.  It may have sheaves for halyards.

TRUE COURSE – The ship’s direction of travel with reference to True North

TRUE NORTH – The direction to the north geographical pole

TRUE NORTH POLE – The position at which the Earth’s axis intersects the surface in the Northern hemisphere

TRUE WIND - The actual direction from which the wind is blowing.

TUMBLE HOME – The amount the sides of a vessel come in from the perpendicular

TUNING - the adjustment of the standing rigging, the sails and the hull to balance the boat for optimum performance

TURNBUCKLE - A threaded, adjustable rigging fitting, used for stays, lifelines, and sometimes other rigging.

TURN UP - To fasten a rope securely by taking turns around a cleat or bollard.

TURN OF THE BILGE - The point where the bottom and the sides of a ship join.

TURTLE - To tip the boat over so that the mast is pointing to the bottom of the lake. (Also not a nice place to be)

TWO BLOCKED – When the two blocks of a tackle have been drawn as close together as possible