Artikel 43

In ships with a deck below the tonnage deck, the transverse sections should be measured partly below and partly above the lower deck. This is to be done in the following way:
The positions of the transverse sections are marked on the lower deck, after which the distance from the top of this deck to the under side of the tonnage deck at the middle plane at each transverse section is measured, and the thickness of the lower deck is ascertained.
The positions of the transverse sections are then determined below the lower deck and the depths from the under side of the lower deck are measured. The sum of the depth taken in the lower hold, the thickness of the lower deck and the depth taken between the tonnage deck and the lower deck, after applying the necessary corrections (see Article 25), constitutes the total tonnage depth. This depth is divided in the usual way in order to ascertain the points of division at which the breadths are taken.