subcomponents have been built. Figure 10 shows a complete television camera modified 

 with selected PTE parts; the camera can be taken to any depth without a heavy pressure 



Figure 10. Pressure tolerant electronic television. 



MATERIALS 



There is a constant search for better materials for use in the undersea environment. 

 To support undersea work systems, three problem areas are receiving special attention at 

 NOSC: transparent materials, high strength-to-weight ratio materials, and undersea cabl- 

 ing. The transparent materials program includes continuing development of design and 

 certification criteria for the use of acrylics, glass, and ceramics in windows (figure 1 1 ), 



Figure 1 1 . Deep ocean window. 



14 



