in and its redoubt.

TENAILLON. In fortification, a low outwork of two faces meeting in a
salient angle, sometimes attached to ravelins to afford nearer flanking
fire.

TENCH. _Tinca vulgaris_, a well-known fresh-water fish.

TEND, TO. To watch a vessel at anchor on the turn of a tide, and cast
her by the helm, and some sail if necessary, so as to keep the cable
clear of the anchor or turns out of her cables when moored.

TENDER. A small vessel duly commanded, and employed to attend a larger
one, to supply her with stores, to carry intelligence or volunteers and
impressed men to receiving ships, &c. An enemy's ship captured by
cutters or boats fitted out as tenders by men-of-war, but without any
commission or authority from the admiralty, will not insure a prize to
the benefit of the ship. The condemnation will be as a droit of
admiralty, on the principle that an officer does not retain his
commission for the purposes of prize on board another ship; but if
captured by one of her boats, and brought to the ship, she is good
prize, as with slaves. _Tender_ is also a synonym of _crank_; thus, a
spar may be _tender_.

TENDING. The movement by which a ship turns or swings round when at
single anchor, or moored by the head, at every change of tide or wind.

TENON. The square heel of a mast, cut for fitting into the step. Also,
the end of any piece of timber which is fashioned to enter into a
mortise in another piece; they are then said to be tenoned together; as,
for instance, the stern-post is tenoned into the keel.

TEN-POUNDER. A name given to a bony mullet-shaped fish of the West
Indies.

TENSILE STRAIN. The greatest effort to extend, stretch, or draw asunder,
as in proving bars of iron, chain-cables, &c.

TENT. A canvas shelter pitched upon a pole or poles, and stayed with
cords and pegs. Also, a roll of lint, or other material, used in
searching a wound. Also, a small piece of iron which kept up the cock of
a gun-lock.

TEREDO NAVALIS. A worm which, furnished with a peculiar augur adaptation
at its head, bores into timber, forming a shell as it progresses. They
attain the length of three feet or more, with a diameter of one inch or
less. Even if the ship be destroyed by them, the loss is not within the
policy of insurance.

TERMINAL VELOCITY OF ANY GIVEN BODY. The greatest velocity it can
acquire by falling freely through the air; the limit being arrived at
when the increase of the atmospheric resistance be