Figure 14. Components of two BUSHIPS lamp casings 

 after testing to destruction. 



PEK LAMP 



The specifications for the lamp to be developed by PEK 

 Laboratories required (a) that it was to be a 500-watt lamp; 

 (b) the casing of the lamp itself was to withstand 20, 000- 

 pounds-per-square-inch static pressure; and (3) the lamp 

 was to burn at 3200 degrees K. The contractor indicated 

 at first that the lamp would be in production quantities in 

 time to meet the operational commitments of the bathyscaph; 

 however, because of difficulties in obtaining the necessary 

 quartz for the pressure-resistant bulb envelope, this sched- 

 ule could not be met. 



The first test lamp was received in February 1961 and 

 burned satisfactorily in water, but under even relatively 

 low pressures it was found to leak. When removed from 

 the pressure tank small amounts of the fluid from the tank 

 had entered the envelope. The envelope was then reworked 

 and tested in the pressure chamber at 20, 000 psi. After 

 burning for 5 minutes, the bulb ceased drawing current. 



