252 SOCIETY NAVAL ARCHITECTS AND MARINE ENGINEERS. 



(5) When the length of the vessel is equal to or greater than 251 meters (equivalent 

 to 823 feet) the same method shall be adopted, but the floodable length shall be at least 

 28 per cent and the number of compartments at least four. 



(6) A bulkhead may be recessed transversely, provided the sides of the recess are at 

 a sufficient distance from the sides of the vessel. 



Vertical steps are inadmissible in the main transverse watertight bulkheads of vessels 

 to which the subdivision rules of Article VIII apply where the factor of subdivision is 

 greater than .5, unless such arrangements are made by additional subdivision as shall main- 

 tain the same measure of safety as that secured by bulkheads without steps. The total 

 length of the steps in any bulkhead shall not exceed 2 per cent of the vessel's length, plus 

 3 meters (equivalent to 10 feet). 



(7) The existence of recesses or steps in a bulkhead shall in no case affect the permis- 

 sible volumes of the compartments adjacent to such bulkhead, as determined by this and the 

 preceding Article. 



Article X. 



If the degree of safety of a vessel is greater than that prescribed by Articles VIII and 

 IX above, and if the owner requests that this fact be recorded on the Safety Certificate, in 

 accordance with Article 17 (paragraph 4) of the Convention, this request shall be accom- 

 panied with all the data necessary to justify this claim. 



In such case, the record shall state the fact that the subdivision is equal to or superior 

 to that provided for a vessel of equal length in Column C of the Table in Article VIII, 

 with an additional statement giving the length of the vessel in Column C whose factor 

 of subdivision according to the rules would be exactly equal to that employed in determining 

 the subdivision of the vessel in question. 



Values of length and factors for lengths not specifically stated in Columns C and A 

 respectively of the Table in Article VIII shall be obtained by interpolation. 



Article XI. 



PEAK AND MACHINERY SPACE BULKHEADS. 



Vessels shall be fitted with a forepeak bulkhead to extend to the bulkhead deck, and 

 to the weather deck in vessels having continuous superstructures. This bulkhead shall be 

 placed at a distance of not less than 5 per cent of the vessel's length from the stem at the 

 load water line. 



An afterpeak bulkvhead and bulkheads dividing the machinery space fromi the cargo 

 and passenger spaces shall also be fitted and carried up to the bulkhead deck. The after- 

 peak bulkhead may, however, be stopped below the bulkhead deck, provided that it shall 

 at least be carried to the first deck above the load water line, and that such deck forms a 

 watertight flat from the afterpeak bulkhead to the stern, and also provided that the degree 

 of safety of the vessel as regards subdivision is not thereby diminished. 



Article XII. 



FIREPROOF BULKHEADS. 



In parts of a vessel above the margin line there shall be fitted fireproof bulkheads 

 which will serve to retard the spread of fire. The mean distance between any two con- 



