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Unformatted text preview: to slide down on
greased skids, called launching ways.
Laying Out ----Marking plates or shapes, for
shearing, punching, etc.
Lazarette ----Ship's storeroom between decks.
Length Between Perpendiculars----The length
of a ship measured from the forward
perpendicular to the after perpendicular.
Knuckle plates. These plates have been shaped
to the exact radius needed for the vessel. They
have been sandblasted and coated on the inside
to stop corrosion inside the vessel.
Kort Nozzles ----A steel tube that surrounds a
propeller, directing the water and improving
efficiency. Length Over All ----The length of a ship
measured from the extreme forward end to the
aftermost point of the stern.
Lift ----To make a template from measurements
taken from the job.
Lightening Hole ----A hole cut in a member to
reduce its weight.
Limber Hole ----A small hole cut in a plate near
the bottom to permit the passage of water.
Liner ----A flat or tapered strip of steel placed
under a plate or shape to bring the member in
line with another which it overlaps. A filler.
Lines ----The form of a ship as represented by
its moulded surface. Kort nozzles are engineered to improve the flow
around the propellers. They are similar in some
ways to an airplane propeller. The propeller
shaft on this vessel is being 'pulled'. Propulsion
systems on vessels are inspected and worn parts
are replaced at each drydock opportunity. L List ----To lean over to one side.
Load Waterline ----Line of surface of water on
a ship when loaded to designed draft. Ladder ----Inclined steps, used aboard ship in
place of "stairs." Loftsman ----A workman in the mold loft, who
lays down ship lines and makes templates. Lap ----A joint in which one part overlaps the
other, thus avoiding the use of a butt strap; also,
the amount of overlap. Longitudinal ----A shell, deck, or bulkhead
stiffener running fore and aft. These run fore and
aft from bulkhead to bulkhead, except in the
shelter and upper decks, where some are broken
by hatch interference. They give strength and E6002 – Ship Terms & Definitions p. 14 © C.G.Daley rigidity to the framework and shell. They are
connected and welded at the flange of the
channel to the shell or deck.
Lug Pad ---A projection on deck with hole for
fastening a block for a lead. M
Main Deck ----Usually the deck immediately
below the shelter or weather deck. Actually, when the ship has been built, the
thickness of the plating will extend outside of
the moulded surface. "Outside" strakes of
plating do not touch the moulded surface if they
have a liner against the shell frame. The heel of
each shell frame is in this moulded surface
(unless joggled). It should be remembered that
this moulded surface is not an actual part of the
ship. It is almost exactly the shape which a thin
piece of sheet rubber would take if stretched
tightly over the shell frames and main deck
beams with no plating in place. (See Fig. 1) Manhole ----A hole cut in a bulkhead, tank top,
etc., to allow the passage of a man.
Margin Plate ----The outboard row of plates of
the inner bottom, connecting to the shell plating
to the bilge.
Marlinspike ----A pointed tapering tool which
is used in separating strands of rope or cable in
Mast ----A large long spar, placed nearly
vertical on the center line of a ship.
Mess Room ----A dining room for officers or
Midship ----At or near the middle point of a
Midship Section ----A cross section through the
ship, midway between the forward and after
Mold Loft ----A shed or building with large,
smooth floor on which the lines of a ship can be
drawn to full scale.
Mooring ----Securing a ship in position by
several lines or cables, so that she cannot move
or swing; anchoring.
Mooring Pipe ----A casting which prevents
chafing of mooring lines passing through
Mould or Mold ----A light pattern of a part of a
ship usually made of thin wood or paper. Also
called a template.
Moulded Surface ----The inside surface of the
skin, or plating, of a ship. The moulded surface
has no thickness, and is fair and smooth. N
Net Tonnage ----A figure obtained by making
deduction from the gross tonnage for space not
available for carrying cargo. O
Oakum ----Untwisted fibers of old rope treated
with a composition of resin and pitch, used to
fill seams of wooden decks.
Offset ----To move out of line or position.
Offsets ----A table of moulded dimensions for
waterlines, decks, etc.
Oil Tight ----Sealed by welding or caulking to
prevent oil leakage. E6002 – Ship Terms & Definitions p. 15 © C.G.Daley Old Man ----A rig for holding a drilling
On Board ----On or in the ship. vessel is on a dry-dock. The painter is using an
air-less paint system. The paint is under very
high pressure (1,000 lbs or more). The coating
protects the steel hull from corrosion. On Deck ----On the upper deck; in the open air.
Outboard ----Away from the centerline,
towards the side of a ship.
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- Winter '14