Artikel 29

1. Should there be any recesses or projections in the double bottom or in the ordinary floors not extending from side tot side of the ship, the recess of projection is to be measured separately and its cubic capacity respectively included in or excluded from the under-deck tonnage, provided in the latter case that the projection forms an integral part of the bottom construction of the ship. The depth of the transverse section is to be measured from the line of continuation of the tank-top or top of floor (see Figures 31 and 32).
2. Should a bottom ceiling exist under the hatchways only, such ceiling should, however, be measured separately and its cubic capacity excluded from the under-deck tonnage. No deduction for thickness of ceiling is to be made when ascertaining the tonnage depths of the various transverse sections in way of a hatchway (see Figure 33).
3. Should there be any bulges on the ship's sides such as propeller bossings, the breadths which may fall in way of the bulges are to be measured to the normal frame-line. The cubic capacity of the bulges should be ascertained and added to the under-deck tonnage.
4. In cruiser stern ships in which the projection beyond the extreme point of the tonnage length is appreciable, the capacity of this space is to be ascertained and added to the tonnage below the upper deck (see Figure 34).