Unclassified 



ity Classificatii 



Ocean pressure hulls 

 Spherical hulls 

 Acrylic plastic hull material 

 66-inch-OD prototype 

 15- inch model sphere 

 Spherical pentagon modules 

 Bonding methods 

 Metal penetrations 

 Metal hatches 

 Restraint systems 

 Pressure vessel testing 

 Photoelastic analysis 

 Panoramic visibility 

 Submersibles 



DD , F °o R v M ..1473 (back) 



(PAGE 2) 



Unclassified 



Security Classificati' 



