OSPREY CLASS--The MHC 51 Class coastal
HITCH--A knot used to bend the end of a line to a ring
minehunter ship.
or to a cylindrical object. Usually, but not always,
designated as some form of hitch.
OTTER--In mine warfare, a device which, when
towed, displaces itself sideways to a predetermined
HOIST--To move an article vertically upward by
distance.
means of some hoisting rig.
PREVENTIVE MAINTENANCE--The regular
HSD--Heat sensing devices that are used to detect a
lubrication, inspection, and cleaning of equipment.
slow or fast rise in temperature for automatic
activation of a magazine sprinkler system.
PRIMARY MAGAZINES--Ammunition stowage
spaces, generally located below the main deck, and
LANYARD--Any line used to attach an article of
insofar as is practical, below the waterline.
equipment to a person.
PRP--Pneumatically released pilot valve.
LEFT-LAID --Refers to line or wire in which the
strands spiral along in a counterclockwise direction
PYROTECHNIC --A device used for illumination,
as one looks along the line.
marking, and signaling.
LINE--In general, sailors refer to fiber rope as line;
RATGUARD--A hinged metal disk that can be
wire rope is referred to as rope, wire rope, or just
secured to a mooring line to prevent rats from using
wire. More exactly, line refers to a piece of rope,
the line to gain access to the ship.
either fiber or wire, that is in use or has been cut for a
RATTLE BARS--Acoustic minesweeping gear (A
specific purpose, such as a lifeline, heaving line, or
Mk 2 (g)) made of pipes.
lead line.
READY-SERVICE MAGAZINES--Spaces
MAGAZINE--Any compartment, space, or locker
physically convenient to the weapons they serve;
that is used, or intended to be used, for the stowage
they provide permanent stowage for part of the
of explosives or ammunition of any kind.
ammunition allowance.
MARLINE --Two-strand, left-laid tarred hemp small
RIGHT-LAID --Refers to line or wire in which the
stuff.
strands spiral along in a clockwise direction as one
looks along the line.
MAXIMUM RANGE--The greatest distance that a
projectile will travel.
SEA PAINTER--Aline led well forward on the ship to
a boat alongside.
MOUSING --Line fashioned around a hook or shackle
to prevent the load from falling off or the shackle
SHOT--One of the lengths of chain that, when joined
pin from being undone.
together, makes up the anchor cable. A standard
shot is 15 fathoms long.
OCCULATING LIGHT--A navigational aid in
which the period of light is equal to or more than the
SLUSH --The act of applying a protective coating to
period of darkness.
line or wire. The substance composing the
protective coating so applied.
OGIVE --The forward portion of a projectile.
SMALL ARMS--Any firearm with a caliber (cal.) of
ONBOARD --Word to describe equipment installed
.60 inch or smaller and all shotguns.
aboard a ship.
SMALL STUFF--Refers to a line 1 1/4 inches or less
OROPESA (or O-type)--Designation given to
in circumference.
mechanical sweep gear, by the British after the
HMS OROPESA, the ship on which the gear was
SOUNDING--A measure of the depth of the water.
developed. It is a sweep in which a length of sweep
STOPPER --A line or chain or a patented device used
wire is towed by a single ship, lateral displacement
for stopping off a rope or chain.
being caused by a multiplane kite (otter), and depth
being controlled at the ship by a multiplane kite
STREAMING--The process of deploying
minesweeping gear in preparation for a sweep
(depressor) and at the otter end by a float and
operation.
pendant.
AI-2
