TREATIES A, B, C denote respectively the areas of the cross-sections at the quarter length forward, amidships, and the quarter length aft, which correspond to the three points obtained by dividing I into four equal parts (the areas corresponding to the two ends of the boat are con- sidered negligible). The areas A, B, C shall be deemed to be given in square metres (or square feet) by the successive application of the following formula to each of the three cross-sections:- Area= - (a+4b+2c+4d+e) h being the depth measured in metres (or in feet) inside the planking or plating from the keel to the level of the gunwale, or, in certain cases, to a lower level, as determined hereafter. a, b, c, d, e denote the horizontal breadths of the boat measured in metres (or in feet) at the upper and lower points of the depth and at the three points obtained by dividing h into four equal parts (a and e being the breadths at the extreme points, and c at the middle point, of A). 3. If the sheer of the gunwale, measured at the two points situ- ated at a quarter of the length of the boat from the ends, exceeds 1 per cent. of the length of the boat, the depth employed in calcu- lating the area of the cross-sections A or C shall be deemed to be the depth amidships plus 1 per cent. of the length of the boat. 4. If the depth of the boat amidships exceeds 45 per cent. of the breadth, the depth employed in calculating the area of the midship cross-section B shall be deemed to be equal to 45 per cent. of the breadth, and the depth employed in calculating the areas of the quarter length sections A and C is obtained by increasing this last figure by an amount equal to 1 per cent. of the length of the boat, provided that in no case shall the depths employed in the calculation exceed the actual depths at these points. 5. If the depth of the boat is greater than 122 centimetres (equiva- lent to 4 feet) the number of persons given by the application of this rule shall be reduced in proportion to the ratio of 122 centimetres to the actual depth, until the boat has been satisfactorily tested afloat with that number of persons on board, all wearing life- jackets. 6. Each Administration shall impose, by suitable formula, a limit for the number of persons allowed in boats with very fine ends and in boats very full in form. 7. Each Administration reserves the right to assign to a boat a capacity equal to the product of the length, the breadth and the depth multiplied by 0.6 if it is evident that this formula does not give a greater capacity than that obtained by the above method. The dimensions shall then be measured in the following manner:- Length. - From the intersection of the outside of the planking with the stem to the corresponding point at the stern post or, in the case of a square sterned boat, to the after side of the transom. 1238
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