BUSHIPS LAMP CASING 



The casing provided by the Bureau of Ships for testing is a 

 standard stock Navy item used in submarines as a navigation 

 lamp. The highest pressure to which it had been subjected 

 by the Bureau was 3000 psi. This pressure had not caused 

 failure of the casing, and it was therefore considered ade- 

 quate for use on present-day submarines. Two of the casings 

 were tested in the bathyscaph pressure facility. The first 

 failed at 4500 psi, the second at 4000 psi. 



Thetests indicated that, including a safety factor of 25 per 

 cent, these lamp casings would be suitable for use to depths 

 of 6 500 feet. At the time the casings were tested, the 

 planned dive schedule for the bathyscaph included a large 

 number of dives to greater depths, and the immediate problem 

 was the development of a lamp for these greater depths. The 

 BUSHIPS casing was therefore set aside for a later diving 

 program during which shallower dives might require large 

 amounts of illumination and the casings could be utilized. 

 Construction of the casings may be seen in figure 13. Fig- 

 ure 14 shows components of two of these lamp casings after 

 testing to destruction. 



mmm 



Figure 13. Disassembled BUSHIPS lamp casing. 



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