, after leaving
the furnaces, pass through a great number of small iron or brass tubes
surrounded by water, by which means these gases are made to impart some
of their heat to the water before they escape; thus fuel is economized.

TUCK. The after-part of a ship, immediately under the stern or counter,
where the ends of the bottom planks are collected and terminate by the
tuck-rail. Thus the fir frigates of 1812-14 had flat, square transoms
similar to boats, or heart-shaped. Hence our square-tucked frigates,
brigs, &c.

TUG. A vessel for towing in and out of harbours and the like. (_See_
STEAM-TUG.)

TUG, TO [from the Anglo-Saxon _teogan_, to pull]. It now signifies to
hang on the oars, and get but little or nothing ahead.

TUGG. A heavy sort of wain or cart, on which the ship-timber for naval
arsenals was formerly conveyed from Sussex.

TUMBLE IN. _See_ TUMBLING HOME.

TUMBLER. One of the numerous names for the porpoise, _Phoc[oe]na
communis_. Also, a contrivance to avoid the necessity of having copper
nailed on the mast to prevent a gaff from chafing it.

TUMBLE UP! A requisition of the boatswain's mates, &c., to quicken the
hands after being piped up. The cry is well understood, though so
contrary to the known tendency of gravitation.

TUMBLING HOME. The opposite of wall-sided, or flaring out. That part of
a ship's side which curves inwardly above the extreme breadth. In all
old sea-books this narrowing of a ship from the extreme breadth upwards
is called housing in. (_See_ UPPER-WORKS.)

TUMBLING SEA. The increased rolling before a gale.

TUMBRIL. A covered cart for conveying ammunition and pioneers' tools.

TUM-TUM. A West India dish, consisting of boiled plantain beat into a
paste and fried.

TUNGULA. A small boat in the Moluccas and Borneo.

TUNNY. A well-known large fish of the family _Scombridae_. It forms an
important branch of Mediterranean commerce.

TURBONADA. A roaring squall, or short hurricane, of frequent occurrence
in the Pacific Ocean [a mimo-phonetic term adopted from the Spaniards].

TURBOT. The _Pleuronectes maximus_, a flat fish in the highest esteem
with all ichthyophagi.

TURKEY-GRAIN. A name for maize.

TURK'S HEAD. An ornamental knot, so called from resembling a turban,
used on side-ropes, &c.; it is worked with a piece of small line by
following the lead till it is formed with three parts to each cross.

TURN, TO TAKE OR CATCH A. To pass a rope once or twice round a clea