some vessel operators have spare rudders built and

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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 stern. Samson Post ----A heavy vertical post which supports cargo booms; kingpost. Scantlings ----The dimensions of various shapes. 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 post.) 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 tight. 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 overboard. 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 upright. 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, looking forward. Stay ----A guy line. S...
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