Artikel 84

When, according to the second paragraph of Article 2, Rule II is to be applied, the measurement of the space below the uppermost deck1) When applying Rule II, to open shelter-deck ships, the shelter-deck shall be regarded as the uppermost deck.shall be carried out by ascertaining in the following manner the ship's length, the extreme outside breadth and the girth:
(1) The length is measured on the uppermost deck from the aft side of the stem to the aft side of the sternpost. Should no sternpost exist or should the sternpost not extend up to the uppermost deck, the length shall be taken to the fore side of the rudder-stock, the latter being, if necessary, imagined to extend up to the uppermost deck (see Figure 117).
(2) The extreme outside breadth is determined by measuring the greatest breadth of the uppermost deck to the outside of the ship's sides, where the level of the upper side of the deck is to be marked off. The tumble-home, if any, is then measured by means of a lead or otherwise. The sum of the breadth and the tumble-home at both sides constitutes the extreme outside breadth (see Figure 118). Rubbing-pieces should not be included in this breadth. In cases where it is possible to determine the extreme outside breadth by inside measurement (e.g., in the machinery space of a steel ship) the greatest breadth to the inside of the plating is measured and to this breadth is added the thickness of the plating at both sides.
(3) The girth should preferably be measured by means of a curb chain passed round the ship outboard at the place where the extreme breadth has been measured (see Figures 119 and 120). The chain must be hauled tight perpendicularly to the keel line, and the upper side of the uppermost deck on both sides shall be marked on it. The girth is then found when measuring on the chain the distance between the points marked off on the chain.