ship is moored or which side of the ship is tied up tothe pier.Superstructure deck. The superstructure deck is a partialdeck above the main, upper, or forecastle deck thatmight not extend to the sides of the ship; or if it does,it does not have side plating carried up to it.Upper deck. The upper deck is a partial deck extendingfrom side to side above the main deck amidships. Itis part of the superstructure, which is the part of aship’s structure above the deck. The superstructuredoes not include masts, yards, stacks, and relatedparts. The side plating extends upward to the upperdeck.Well deck. The well deck is the forward part of the maindeck between upper deck and forecastle and aftbetween the upper deck and the poop deck.Doors and HatchesAccess through bulkheads is provided by doors andthrough decks by hatches. Watertight (WT) doors, as theterm implies, form a watertight seal when properlyclosed. All doors leading to weather decks are of thewatertight variety, as are those in structural (watertight)bulkheads. (See fig. 8-4.) The doors are held closed byfittings called dogs, which bear up tight on wedges. Arubber gasket around the edge of the door pressesagainst a knife-edge around the doorframe forming awatertight seal when all dogs are properly seated(dogged down). Some doors have individually operateddogs, as shown in figure 8-5. Other doors are quickacting types, for which a handwheel or lever operates allthe dogs at once, as shown in figure 8-6. Some WT doorshave openings, called passing scuttles, through whichammunition is passed. These scuttles (small tubelikeopenings) are flashproof as well as watertight.8-5Student Notes:Figure 8-4.—Dogs and gasket for watertightdoor.Figure 8-5.—Watertight door with individuallyoperated dogs.Figure 8-6.—Quick-acting watertight door.
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