Parallel Middle Body: The length over which the midship section remainsconstant in area and shape.Entrance: The immersed body of the vessel forward of the parallel middlebody.Run: The immersed body of the vessel aft of the parallel middle body.Tonnage: This is often referred to when the size of the vessel is discussed,and the gross tonnage is quoted from Lloyd’s Register. Tonnage is a measureof the enclosed internal volume of the vessel (originally computed as 100cubic feet per ton). This is dealt with in detail in Chapter 30.Deadweight: This is defined in Chapter 1. It should be noted that for tankersdeadweight is normally quoted in ‘long tons’ rather than ‘metric tonnes’.The principal dimensions of the ship are illustrated in Figure 2.1.
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