TREATIES REGULATION XXIII. Maintenance of Conditions after Survey. Maintenance of conditions after sur- vey. Life saving appli- ances, etc. After the survey of the ship as provided in Regulation XXII has been completed no change shall be made in the structural arrange- ments, machinery, equipments, &c., covered by the survey, without the sanction of the Administration. LIFE SAVING APPLIANCES, &c. REGULATION XXIV. Standard Types of Boats. Standard typ es of The standard types of boats are classified as follows:- Class I.- Open boats with rigid sides having either (a) internal buoyancy only, or (b) internal and external buoyancy. Class II.- (a) Open boats with internal and external buoy- ancy-upper parts of sides collapsible, and (b) decked boats with either fixed or collapsible watertight bulwarks. 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 metres (equivalent to 125 cubic feet). No boat may be approved the weight of which when fully laden with persons and equipment exceeds 20,300 kilogrammes (equivalent to 20 tons). REGULATION XXV. Lifeboats of Class I. Lifeboats of Class I. Conditions. Internal buoyancy only. Lifeboats of Class I must have a mean sheer at least equal to four per cent. of their length. The air cases of lifeboats of Class I shall be so placed as to secure stability when fully laden under adverse weather conditions. In boats certified to carry 100 or more persons the volume of the buoyancy shall be increased to the satisfaction of the Administration. Lifeboats of Class I must also satisfy the following conditions:- (a.) Lifeboats 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. 1228
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