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Unformatted text preview: to a plate. Also, the
motion of the ship from side to side, alternately
raising and lowering each side of the deck.
Roller Chock ----(See Chock Roller.) Some vessel operators have spare rudders built
and in storage at a shipyard so they will be ready
on short notice. Rose Box ----A screen or strainer placed around
the end of a bilge suction pipe. Rudder Stop ----Lug to limit the swing of the
rudder. Rudder ----A flat piece or structure of wood or
metal attached upright to the sternpost (or in
single screw-vessels, to the rudder post) of a
vessel by hinges, or pintles and gudgeons, so
that it can be turned, as by a tiller, causing the
vessel's head to turn in the same direction,
because of the resistance offered to the water by
the rudder. S
Sagging ----Straining of the ship which tends to
make the middle portion lower than the bow and
Samson Post ----A heavy vertical post which
supports cargo booms; kingpost.
Scantlings ----The dimensions of various
Scarf ----To thin out or taper a corner or edge of
a plate or shape to make a lap. A joint in a stem,
bar keel or stern frame. Here is a rudder on an inland river towboat.
Rudder Post ----After post of stern frame to
which the rudder is hung. (Also called stern
Rudder Stock ----The shank of a rudder which
extends through shell upward to the steering
engine. Screen Bulkhead ----A bulkhead, usually
placed between the engine room and boiler
room, which is fire proof, dust proof, and gas
Scupper ----A deck drain.
Scupper Pipe ----A pipe which drains water
from scuppers throughout the side of a ship.
Scuttle ----A very small hatch; a manhole.
Sea Chest ----A compartment through which sea
water is admitted or discharged. E6002 – Ship Terms & Definitions p. 18 © C.G.Daley Seam ----A riveted or welded plate edge
connection. A riveted seam overlaps; welded
seam may or may not overlap.
Serrated frame----Sometimes pieces of an
angle iron are cut to allow for ventilation, reduce
weight or as a shortcut that saves material in the
vessel construction. These cutouts may be
spaced regularly - every few inches or so and the
frame is called a serrated frame.
Set ----Metal mold or template for use on
bending slab. Sheer Strake ----The top full course of side
shell plating. Set Iron ----A bar of soft iron used on bending
slab to give shape of frames. Shell Expansion ----A plan showing details of
all shell plating and shell longitudinals.
(Longitudinals would appear only on tankers) Shaft Alley ----A casing (large enough in which
to walk), covering the propeller shaft and
extending from engine room to after peak. Shell Landings ----Points on the frames where
the edges of shell plates are to be located. Shape ----A bar of constant cross section, such
as a channel, T-bar, angle bar, etc. Also, to
impart curvature to a plate or other member. Shell, or Shell Plating ----The plates forming
the outer skin of the hull. The principal function
of the shell is to act as a watertight skin. It also
gives strength to the construction of intermediate
parts. Shear Line ----A line at which a shearing cut is
to be made. Shelter Deck ----A continuous superstructure
deck above the freeboard deck. Shears ----A large machine for cutting plates
and shapes. Shore ----A temporary brace or prop. Shaft Tunnel ----(See Shaft Alley.) Sheer ----Curvature of deck in a fore and aft
direction as seen in profile. The amount of sheer
forward is the difference in height between the
deck line (at side) amidships and the deck line at
the forward end (see Fig. 4) The amount of sheer
aft is the difference in height between the deck
(at side) amidships and the deck at the after end.
The line of the deck at center, in the profile, is
higher than the line of the deck at side, owing to
the camber, or transverse curvature of the deck.
In Fig. 4 is illustrated the difference between the
deck at the side and the deck at the center, owing
to camber. The camber curve, as usually
designed, is a circle of very large radius, but
sometimes it is made as a series of straight lines,
as in Fig. 5. The camber curve is the moulded
line of the deck. Side Thruster ----A propeller in a tube that is
mounted through the hull. They are particularly
handy for maueuvering by providing side thrust.
Sight Edges ----Visible edges of plating (outside
shell and above decks.)
Skylight ----An opening in a deck to give air
and light to the compartment below it.
Sliding Way ----That part of launching way
which moves with the ship.
Slop Chute ----Chute for dumping garbage
Sounding Pipe ----Vertical pipe in oil or water
tank used in measuring depth of liquid in tank.
Spar ----Long, round member such as mast or
boom; part of rigging.
Stability ----The tendency of a ship to remain
Staging ----Planks or scaffolding on which to
stand when working on sides or under decks. E6002 – Ship Terms & Definitions p. 19 © C.G.Daley Stanchion ----A pillar or upright post.
Starboard ----The right hand side of a ship,
Stay ----A guy line.
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- Winter '14