EPITOME 



A model of the hull of Alvin was subjected to loads of uniform external 

 pressures, and the resultant stress distribution was experimentally deter- 

 mined. The model was basically a "thin" hemispherical shell having a 

 thickened portion at the window opening. The study also included an analysis 

 of the effect of cable penetrations in the thickened portion of the shell. The 

 results from the experimental stress analysis can be transformed by struc- 

 tural similitude to verify the adequacy of the full scale design. 



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