262 SOCIETY NAVAL ARCHITECTS AND MARINE ENGINEERS. 



For intermediate depths the freeboard is obtained by interpolation. 



If the sheer is less than the standard sheer defined above, the minimum freeboard is 

 obtained by adding to the figures in the table one-seventh of the difference betv^reen the 

 standard sheer and the actual mean sheer measured at the stem and stem post ; no deduction 

 is to be made from the freeboard on account of the sheer being greater than the standard 

 sheer or on account of the camber of the deck. 



Article XXX. 



MOTOR BOATS. 



When motor boats are accepted, the volume of internal buoyancy and, when fitted, the 

 external buoyancy, must be fixed, having regard to the difference between the weight of the 

 motor and its accessories and the weight of the additional persons which the boat could ac- 

 commodate if the motor and its accessories were removed. 



Article XXXI. 



ARRANGEMENTS FOR CLEARING PONTOON LIFEBOATS OF WATER. 



All pontoon lifeboats shall be fitted with efficient means for quickly clearing the deck of 

 water. The orifices for this purpose shall be such that the water cannot enter the boat 

 through them when they are intermittently submerged. The number and size of the ori- 

 fices shall be determined for each type of boat by a special test. 



For the purpose of this test the pontoon boat shall be loaded with a weight of iron 

 equal to that of its complement of persons and equipment. 



In the case of a boat 8.5 meters in length (equivalent to 28 feet) 2 tons of water shall 

 be cleared from the boat in a time not exceeding the following: 



Seconds. 



Type IC 60 



Type 2B . 60 



Type 2C , 20 



In the case of a boat having a length greater or less than 8.5 meters (equivalent to 28 

 feet) the weight of water to be cleared in the same time shall be, for each type, directly pro- 

 portional to the length of the boat. 



Article XXXII. 



CONSTRUCTION OF BOATS. 



Open lifeboats of the first class (types lA and IB) must have a mean sheer at least 

 equal to 4 per cent of their length. 



The air cases of open boats of the first class shall be placed along the sides of the boat ; 

 they may also be placed at the ends of the- boat, but not in the bottom of the boat. 



Pontoon lifeboats may be built of wood or metal. If constructed of wood, they shall 

 have the bottom and deck made of two thicknesses with textile material between; if of metal, 

 they shall be divided into watertight compartments with means of access to each compart- 

 ment. 



All boats shall be fitted for the use of a steering oar. 



