260 SOCIETY NAVAL ARCHITECTS AND MARINE ENGINEERS. 



No boat may be approved the buoyancy of which depends upon the previous adjustment 

 of one of the principal parts of the hull, or which has not a cubic capacity of at least 3.5 

 cubic meters (equivalent to 125 cubic feet). 



Article XXVIII. 



BOATS OF THE FIRST CLASS. 



The standard types of boats of the first class must satisfy the following conditions : 



1a. open boats with internal buoyancy only. 



The buoyancy of a wooden boat of this type shall be provided by watertight air cases, 

 the total volume of which shall be at least equal to one-tenth of the cubic capacity of the 

 boat. 



The buoyancy of a metal boat of this type shall not be less than that required above 

 for a wooden boat of the same cubic capacity, the volume of watertight air cases being in- 

 creased accordingly. 



1b. open boats with internal and external buoyancy. 



The internal buoyancy of a wooden boat of this type shall be provided by watertight 

 air cases, the total volume of which is at least equal to 7^ per cent of the cubic capacity of the 

 boat. 



The external buoyancy may be of cork or of any other equally efficient material, but 

 such buoyancy shall not be secured by the use of rushes, cork shavings, loose granulated 

 cork or any other loose granulated substance, or by any means dependent upon inflation 

 by air. 



If the buoyancy is of cork, its volume, for a wooden boat, shall not be less than thirty- 

 three thousandths of the cubic capacity of the boat; if of any material other than cork, 

 its volume and distribution shall be such that the buoyancy and stability of the boat are 

 not less than that of a similar boat provided with buoyancy of cork. 



The buoyancy of a metal boat shall be not less than that required above for a wooden 

 boat of the same cubic capacity, the volume of the air cases and external buoyancy being in- 

 creased accordingly. 



Ic. pontoon boats, in which persons cannot be accommodated below the deck^ 



HAVING A well DECK AND FIXED WATERTIGHT BULWARKS. 



The area of a well deck of a boat of this type shall be at least 30 per cent of the total 

 deck area. The height of the well deck above the water line at all points shall be at least 

 equal to one-half per cent of the length of the boat, this height being increased to Ij^ per 

 cent of the length of the boat at the ends of the well. 



The freeboard of a boat of this type shall be such as to provide for a reserve buoy- 

 ancy of at least 35 per cent. 



Article XXIX. 



BOATS OF THE SECOND CLASS. 



The standard types of boats of the second class must satisfy the following conditions : 



