The finalized form of the lamp may be seen in figures 5 

 and 6, and the components in figures 7 and 8. This lamp 

 was tested at 16, 000 psi for 21 hours and operated satis- 

 factorily. It was then placed under a pressure of 20, 000 

 psi, which caused failure after 60 minutes. Figures 9 and 

 10 show the test lamp after removal from the pressure 

 chamber. 



Figure 5. Oblique view of assembled NEL deep sub- 

 mergence lamp. 



11 



