Figure 2. Engineering concept of the Naval Experimental Manned Observatory 

 for continental shelf depths. 



Scope of Investigation 



The present study was limited to the investigation of a single 120-inch 

 spherical capsule concept, grade G acrylic Plexiglas material, a single fabrication 

 technique, and one operational depth. Only sufficient experimental investiga- 

 tions and analytical studies were to be performed to substantiate the adequacy 

 of a single prototype 66-inch detailed capsule design for operation at continental 

 shelf depth. The experimental data were limited to the recording of critical 

 pressures, change of displacement, and strains of capsules under hydrostatic 

 pressure. Analytical studies were limited to calculating critical pressure and 

 strains under short-term loading, the only experimental condition for which 

 analytical tools were in existence. 



