Artikel 73

The measurement and the calculation of the cubic capacity of the spaces dealt with in Articles 61 to 63 and 66 to 70 shall be carried out as indicated in Articles 53 and 54. Consequently, the heights are to be measured to the under side of the deck overhead through panelling, if any. The horizontal measurements of these spaces are to be taken between the partitions and linings, if any, or to the inner edge of frames, or to the inner edge of the normally spaced bulkhead stiffeners to which the measurements have been taken when ascertaining the gross tonnage. Each space is to be measured separately, and the formulae of measurement should indicate the purpose for which the space is intended. If only parts of a space have been deducted, the dimensions of the whole space, along with those of the space deducted, shall be shown in the formulae of measurement (see Figure 98).
The measurement of peak-tanks and other water-ballast spaces extending from side to side of the ship, and situated outside the double bottom and below the tonnage deck or its line of continuation, shall be carried out in conformity with the rules for the measurement of the space below the tonnage deck. The length shall be measured at the top of the tank (see Figures 96 and 97). Transverse sections shall be measured in the usual way at the middle of the length and at its extreme points, but only five breadths are to be taken in each section. If a water-ballast space is situated partly below and partly above the tonnage deck or its line of continuation (e.g., a peak-tank aft extending to the under side of a raised quarter-deck), the part situated below the tonnage deck or its line of continuation shall be measured as indicated above and the remaining part shall be measured as a superstructure.
For all tanks extending from side to side of the ship, the distance from the end bulkhead or bulkheads to the correct position of the nearest transverse section of the space below the tonnage deck is to be ascertained and stated in the formulae of measurement.
The measurement of water-ballast spaces not extending from side to side of the ship and situated below the tonnage deck and outside the double bottom shall be carried out as follows. First measure the length of the tank; this length shall be divided as indicated in Article 21, but, in case this length does not exceed 30 feet, or 9.14 metres, it shall only be divided into two equal parts. Transverse sections are then measured at the extreme points of the length and at its points of division. When the spaces referred to in the present paragraph are of relatively small height, they may also be measured as provided in Article 53, if they are bounded by approximately straight planes. If a tank is irregular in shape, it shall be measured in parts.
Water-ballast spaces situated above the tonnage deck or its line of continuation shall be measured as indicated in Article 53.
The cubic capacity of each water-ballast space shall be ascertained by applying the relevant provisions given in the present Regulations for the determination of the cubic capacity of the space below the tonnage deck and of superstructures.