INTERNATIONAL CONVENTION SAFETY OF LIFE AT SEA. 265 



h being the depth measured in meters (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 here- 

 after. 



a, b, Cj d, e denote the horizontal breadths of the boat measured in meters (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, oi h). 



3. If the sheer of the gunwale, measured at the two points situated 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 calculating 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 amidship exceeds 45 per cent of the breadth, the depth em- 

 ployed 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 centimeters (equivalent to 4 feet) the 

 number of persons given by the application of this rule shall be reduced in proportion to the 

 ratio of 122 centimeters 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 formulae, 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 di- 

 mensions shall then be measured in the following manner : 



Length. — From the intersection of the outside of the planking with the stem to the cor- 

 responding point at the stern post or, in the case of a square sterned boat, to the after side 

 of the transom. 



Breadth. — From the outside of the planking at the point where the breadth of the boat 

 is greatest. 



Depth. — Amidships inside the planking from the keel to the level of the gunwale, but 

 the depth used in calculating the cubic capacity may not in any case exceed 45 per cent of the 

 breadth. 



In all cases the vessel owner has the right to require that the cubic capacity of the boat 

 shall be determined by exact measurement. 



8. The cubic capacity of a motor boat is obtained from the gross capacity by deduct- 

 ing a volume equal to that occupied by the motor and its accessories. 



Article XXXVIII. 



DECK AREA OF PONTOON BOATS AND OPEN BOATS OF THE SECOND CLASS. 



1. The area of the deck of a pontoon boat of type IC, 2B, or 2C shall be determined by 

 the method indicated below or by any other msethod giving the same degree of accuracy. The 

 same rule is to be applied in determining the area within the fixed bulwarks of a boat of 

 type 2A. 



