Artikel 34

The breadths of each transverse section are numbered from the top downwards, the upper breadth, at the level of the upper extreme point of the tonnage depth, being No. 1, the lowest breadth No. 5 or No. 7, as the case may be.
The breadths are measured perpendicularly to the middle plane through the points of division and the extreme points of the tonnage depth from ceiling to ceiling, if fitted, and, if not, between the inner edge of the frames. The thickness of the ceiling is also ascertained. The projecting parts of stringers, shelves, or other projecting constructions for strengthening are not to be regarded as ceiling (see Figures 37 and 38).
When spar ceiling in steel ships is not fitted directly against the edge of the frames, it is advisable to measure to the frames, and from the breadth thus obtained deduct the thickness of the ceiling measured horizontally.
Should there be no frame at the place where a breadth is to be taken, such breadth shall be measured to the shell, and the horizontal depth of the nearest frame deducted therefrom at each side.
If it is impossible to measure a breadth at its proper level, it should be measured as close thereto as possible. It should be very accurately ascertained how far above or below the proper level the breadth is being measured, and, if necessary, full particulars as to this should be given in the formulae of measurement.
When measuring the upper and lowest breadths, the provisions of Articles 37 and 38 are to be observed.