Artikel 88

The measurement of all superstructures and hatchways on or above the uppermost deck shall be carried out by ascertaining their mean breadth, mean length and mean height, if practicable in accordance with the provisions contained in Part III. In no case, however, shall more than one breadth be used. When it is impracticable to ascertain internal measurements, external measurements shall be taken.
The cubic capacity of such spaces is ascertained by multiplying the length by the breadth, and the product of the area thus obtained, by the height. This last product shall be deemed to be the cubic capacity in cubic feet or in cubic metres.