part of a ship; as, "Forecastle
there!" "Mast-head there!"

THERE AWAY! A phrase accompanied by pointing on a bearing, or to an
object in sight. Thereabout, in that quarter.

THERMOMETER. An instrument to measure the amount of heat by the
expansion of a fluid (generally quicksilver) contained in a glass bulb,
in connection with which is a hermetically closed tube, up which the
fluid rises as the heat increases. This tube is graduated differently in
different countries.

THERMOMETRIC SAILING. A scheme for detecting the approach to shoal water
by the diminution of temperature, and found to be useful in some
places, such as the Agulhas and Newfoundland Banks; in the latter a
difference of 20 deg. has been observed, on quitting the Gulf Stream and
gaining soundings in 100 fathoms.

THICK-AND-DRY FOR WEIGHING! To clap on nippers closely, just at starting
the anchor from the ground.

THICK AND THIN BLOCK, OR FIDDLE-BLOCK. A block having one sheave larger
than the other, sometimes used for quarter-blocks.

THICK STUFF. Sided timber, or naval planks, under one foot, and above 4
inches in thickness.

THIEVES' CAT. A cat o' nine tails having knots upon it, and only used
for the punishment of theft.

THIMBLE. An iron ring with a concave outer surface to contain snugly in
the cavity a rope, which is spliced about it. Its use is to defend the
rope which surrounds it from being injured by another rope, or the hook
or a tackle which passes through it.

THIMBLE-EYES. Are thimble-shaped apertures in iron-plates where sheaves
are not required; frequently used instead of dead-eyes for the
topmast-rigging, futtock-plates, and backstays in the channels.

THODS. An old northern term for sudden gusts of wind.

THOKES. Fish with broken bellies, which are prohibited to be mixed or
packed with tale fish.

THOLE, THOLE-PIN, OR THOWEL [from the Anglo-Saxon _thol_]. Certain pins
in the gunwale of a boat, instead of the rowlock-poppets, and serving to
retain the oars in position when pulling; generally there is only one
pin to each oar, which is retained upon the pin by a grommet, or a cleat
with a hole through it, nailed on the side of the oar. The principal use
is to allow the oar, in case of action, suddenly to lie fore-and-aft
over the side, and take care of itself. This was superseded by the
swinging thowel, or metal crutch, in 1819, and by admiralty order at
Portsmouth Yard in 1830.

THORN-BACK. A well-known fish of the ray k