Artikel 25

The tonnage depth of a transverse section is the distance from the under side of the tonnage deck to the top of the main floors or the top of the double bottom, as defined in Article 26, minus the thickness of the bottom ceiling, if fitted, and one-third of the round of beam, this depth being, if necessary, corrected as indicated in Article 28 where the top of the double bottom is not horizontal.1)Should the tonnage deck beams rise in a straight line from the sides towards the middle plane, the correction for the rise of beam will be one-half instead of one-third of the rise of the beam. Such rise is determined and applied in the same manner as indicated in Articles 24, 25, 30 and 43 for the round of beam.
If a transverse section is situated at a place where the deck is interrupted the depth is the distance from the line of continuation of the tonnage deck to the top of the floor or the double bottom, with the deductions and correction mentioned above.