20 SAFETY OF LIFE AT SEA. APPLICATION OF SUBDIVISION 



sary to refer to these as they do not affect the general design of the vessel, except 

 as mentioned later as regards doors in bulkheads and openings in vessel's side. 



APPLICATION OF CONVENTION REQUIREMENTS TO COASTWISE VESSELS. 



In order to show how the Convention requirements would affect a vessel in the 

 coastwise trade, a typical passenger and freight steamer as used on the east coast of 

 the United States is herewith taken. 



Plate 2, profile D, shows the vessel as built. 



On Plate 3, profile E, the main deck is taken as the bulkhead deck and the 

 floodable lengths have been shown, spacing them off firstly from the machinery 

 space and then toward the ends of the vessel. A curve of floodable lengths is also 

 given. 



Plate 4 gives diagrams showing the vessel floating at the margin line. The 

 watertight bulkheads are located as in profile E and form the boundaries of the 

 floodable lengths. 



By referring to Plate i, curves of factors of subdivision, and allowing that 

 the vessel under consideration is half-way between types B and C, for the vessel's 

 length which is 385 feet we obtain a factor of subdivision of .j6. Multiplying the 

 floodable lengths shown on profile E by this factor of .yd we obtain the spacing of 

 the watertight bulkheads as shown on profile F. 



On Plate 5, profile G, the watertight bulklieads have been spaced as required 

 by Department of Commerce, Steamboat-Inspection Service Rule III, Section 24, 

 Edition January 13, 1914. 



Comparing profile D, as built with profile F, as required by the Convention, 

 this vessel, if affected by the Convention, will require two more bulkheads fitted 

 forward unless the machinery space is placed further forward or other arrange- 

 ments made. This vessel will also require two watertight bulkheads in the after 

 hold and be fitted with a double bottom all fore and aft, whereas at present this 

 vessel has only a double bottom under the engine room. If this vessel were built 

 to conform to the Convention requirements, it will be seen from this example how 

 some of the coastwise passenger and freight steamers would require more bulk- 

 heads in the hold and 'tween decks ; the vessel would require more depth so as to 

 allow of a double bottom being fitted and to allow of the arrangement of the doors 

 in watertight bulkheads and through the vessel's side to be above the load water- 

 line. 



It should be noted that this vessel as arranged on profile F will founder if 

 she has any two adjoining compartments flooded. The same remark applies to 

 profile G, where the watertight bulkheads are arranged according to the Steam- 

 boat-Inspection Rules. 



On Plate 5, profile H, the bulkhead deck has been taken at the hurricane deck 

 and, with the spacing of watertight bulkheads shown, the vessel will float with any 

 two adjoining compartments flooded, assuming that the vessel has sufficient stability 

 in this condition. 



