THE PROBLEM 



Develop the best combination of light source and casing, 

 compatible with the existing power supply, for observation 

 and photography from the bathyscaph TRIESTE in the deep- 

 sea environment. 



This problem was complicated by a short time period allowed 

 due to urgent operational commitments of the bathyscaph. 

 The work was directed toward achieving reliability under 

 all conditions of pressure and temperature expected to exist 

 in the deep ocean; ease of unit replacement; adequate areal 

 lighting for visual observations; and best possible color 

 temperature for underwater photography. 



RESULTS 



1. In view of the urgency in getting the bathyscaph operational, 

 it was necessary to accept a compromise in the problem solu- 

 tion. While development of a lamp that will meet all the above 

 requirements is approaching completion, the present system 

 meets only the first three requirements, namely, reliability, 

 ease of replacement, and adequate areal lighting for visual 

 observations. 



2. The system developed involves two types of lamps, both 

 of which are light in weight and easily replaceable. One gives 

 good reliability with an extremely long bulb life; the other 

 gives good areal lighting, but has relatively short bulb life. 



A supplementary report will be made upon completion of 

 development of the more nearly ideal lamp that is now in the 

 testing stages. 



RECOMMENDATIONS 



1. Continue the program to improve the presently operational 

 lighting system on the bathyscaph. 



2. Complete development of a lamp that meets all of the 

 requirements stated above. 



MBL/WHOI 



0301 0040551 



