arts of the world which are
subject to monsoons, and take place at those seasons when the monsoons
are changing. They seem to be eddies formed by the meeting of opposing
currents of air--for instance, the westerly winds near the equator and
the easterly winds of higher latitudes--which accounts for the important
fact that these storms revolve in opposite directions in the two
hemispheres--in the southern with, in the northern against, the hands of
a watch; but the circular tendency in both supports the name of
cyclone.

U.

UGLY. A term applied to a threatening heavy atmosphere, also to a
head-sea. Also, to an ugly craft, as a mischievous foe, or a pirate.

ULCUS. An old term for the hulk of a ship of burden (_leg._ Ethelred).

ULIGINOUS CHANNELS. Those connecting the branches of rivers, by cuts
through the soil.

ULLAGE. The remainder in a cask or package which has leaked or been
partially used.--_Ullaged_ is used for damaged, short of contents.

ULTIMATUM. The final conditions upon which any proposition or treaty
with an enemy can be ratified.

ULTRA MARE. Beyond seas--a naval law term.

ULTRA VIRES. Beyond the power of might or right to interfere.

ULTRA-ZODIACAL. Beyond the limits of the zodiac; applied to those
asteroids that revolve outside the ancient zodiac.

UMBRA. The dark shadow of the moon, earth, or any other planet.

UMBRELLA-WARPING. A contrivance similar to an umbrella, by which ships
in a calm can be warped ahead.

UNATTACHED. In military phraseology, an officer not belonging to any one
company or regiment, or on half-pay.

UNBEND, TO. To cast off or untie; to remove the sails from their yards
and stays; to cast loose the cables from their anchors, or to untie one
rope from another.

UNBITT, TO. To remove the turns of a cable from off the bitts. (_See_
BITTS.)

UNCLAIMED, AS DERELICT. Vessels found at sea without a human being, or a
domestic animal, on board are good prizes, if not claimed within 366
days. If so claimed, full salvage, or half her value, is assigned to the
salvors.

UNDECAGON. A geometrical figure of eleven equal sides and angles.

UNDER BARE POLES. The condition of a ship under no canvas, or when the
wind is too violent to allow of any sail being set on her.

UNDER-BEVELLING. The alteration made inside a square in hewing timber,
as opposed to standing bevelling.

UNDER-BRIGHT. A meteorological term for the strong light which sometimes
appears below cloud