Artikel 56

The aggregate tonnage of the hatchways shall consist of the sum of the cubic capacity of all hatchways leading to spaces which are included in the gross tonnage. Therefore a hatchway leading to an exempted space, as defined in Articles 57 and 58, shall not be included in this aggregate. The cubic capacity of a hatchway, however, situated within an open space but leading to a space included in the gross tonnage, shall form part of the said aggregate tonnage.
Hatchways leading to spaces which are not included in the gross tonnage shall nevertheless be measured, and their dimensions be stated on the formulae of measurement.
The portion of a closed-in trunk (e.g., coal-shoot) situated within the boundaries of a superstructure shall be treated as a closed superstructure and therefore included in the gross tonnage (see Figure 71), except where the said trunk leads to an exempted space (see Figure 72).