f 110 paces in a minute.

ORDNANCE. A general name for all sorts of great guns which are used in
war. Also, all that relates to the artillery and engineer service.

ORDNANCE-HOY. A sloop expressly fitted for transporting ordnance stores
to ships, and from port to port.

OREILLET. The ear-piece of a helmet.

OREMBI. A small _korocora_ (which see).

ORGUES. Long-pointed beams shod with iron, hanging vertically over a
gateway, to answer as a portcullis in emergency.

ORIENT. The east point of the compass.

ORIFLAMME. The banner of St. Dennis; but the term is often applied to
the flags of any French commander-in-chief.

ORIGIN. Merchant ships claiming benefit for importation, must obtain and
produce certificates of _origin_, in respect to the goods they claim
for. (_See_ PRODUCTION.)

ORIGINAL ENTRY. The date at which men enter for the navy, and repair on
board a guard-ship, or tender, where bedding or slops may be supplied to
them, and are forwarded with them to their proper ships.

ORILLON. In fortification, a curved projection formed by the face of a
bastion overlapping the end of the flank; intended to protect the latter
from oblique fire; modern ricochet fire renders it of little
consequence.

ORION. One of the ancient constellations, of which the lucida is the
well-known nautical star _Betelgeuze_.

ORISONT. The horizon; thus spelled by our early navigators.

ORLOP. The lowest deck, formerly called "over-lop," consisting of a
platform laid over the beams in the hold of ships of war, whereon the
cables were usually coiled, and containing some cabins as well as the
chief store-rooms. In trading vessels it is often a temporary deck.

ORLOP-BEAMS, OR HOLD-BEAMS. Those which support the orlop-deck, but are
chiefly intended to fortify the hold.

ORNAMENTS. The carvings of the head, stern, and quarters of the old
ships.

ORNITHAE. An ancient term for the periodical winds by which migratory
birds were transported.

ORTHODROMIC. The course which lies on a meridian or parallel.

ORTHOGRAPHIC PROJECTION. The profile, or representation of a vertical
section, of a work in fortification.

ORTIVE AMPLITUDE. The eastern one.

OSCILLATING MARINE-ENGINE. A steam-engine where the top of the
piston-rod is coupled with the crank, and the piston-rod moves backward
and forward in the direction of the axis of the cylinder, while its
extremity revolves in a circle with the crank.

OSCILLATING PUMP-SPEAR. A contrivan