Popular Science Monthly 



541 



The food cargo is carried in air-tight, water-tight containers which float on the water when 

 the ship goes down. Each tank contains a compressed-air chamber to provide buoyancy 



tainers to rise to the surface and with 

 the engines and boilers located in the 

 center and the cargo containers fore and 

 aft. A ship so built that the containers 

 could be placed in the hold, with the 

 decks merely pinned over them, is also con- 



sidered. With such a ship the containers 

 could easily force the decks upward when 

 the inrushing water caused them to rise, 

 and come to the surface. They could 

 float about on the water for days if neces- 

 sary until salvaged. 



