Artikel 38

The lowest breadth situated at the level of the lowest extreme point of the tonnage depth must be measured on top of floors, or ceiling if fitted, or on the tank-top, as the case may be, in accordance with the following rules:
1. In ships with a double bottom the top of which is horizontal or falls or rises from the middle plane to the wings, the breadth is to be measured between the knuckle lines of the margin plates (see Figures 45, 46, 47 and 48). If, however, the upper edge of the knees connecting the double bottom with the frames continues in line with the tank-top (see Figure 49), the breadth is to be measured to the inner edge of frames, or of the ceiling thereon if fitted. This last method shall also be used when the tank-top extends to the sides of the ship, and the knees are fitted more than two frame spaces apart (see Figure 50); but if the knees are spaced closer, the breadth should be measured to the points of intersection of the knees with the tanktop (see Figure 51).
2. In ships with a single bottom, the lowest breadth shall be taken between the points up to which the top line of floors or ceiling is horizontal (see Figures 52, 53, 54, 55 and 56).