The control circuits located in the sphere, when activated, 

 in turn activate relays making and breaking the circuits 

 concerned with motors and lighting. This system has proved 

 to be reliable and efficient. The hull connectors themselves 

 are located radially around the primary observation window 

 at the front of the sphere. There are 12 hull connectors; 

 however, only nine of these are concerned with electrical 

 wiring. Three types of hull connectors are installed: 



1. Six 30-wire connectors with No. 17 polyethylene insulated 

 solid conductor wire. 



2. Two 12 -wire connectors with the same conductors as 

 above but with thicker insulation. 



3. The 24 volt dc power cable (No. 0) from No. 4 battery 

 box that supplies the sphere power. 



The hull connectors themselves are plastic-filled steel 

 cones potted with epoxy material that adjusts itself to in- 

 creasing pressure at depth. 



Lighting 



TRIESTE is fitted with two lighting systems. One sys- 

 tem consists of NEL-developed 150-watt incandescent lamps, 

 of which there are 15 located in clusters of five each be- 

 neath the float. All three clusters are located forward of 

 the primary observation window. These lamps operate on 

 24 volts at 6 amperes. The second system is the Edgerton 

 lighting system consisting of five 300-watt incandescent 

 lighting units that provide intensification of lighting where 

 needed. Four of these units are located forward of the 

 primary observation window, and one in the vicinity of the 

 television camera which is aft and beneath the entrance tube. 

 Additional lighting may be added or the existing units may 

 be moved to suit varying requirements. The limit is deter- 

 mined by the number and rating of the control relays in the 

 relay box. Investigations are now being carried out to 

 develop improved lighting; however, at present it appears 

 that pressure -encapsulated incandescent lamps are the only 

 solution for reliability in long periods of use. 3 



2 Navy Electronics Laboratory Report 1094, Evaluation of 

 External Lighting Systems for the Bathyscaph~TRIEST E, by 

 L. A. Shumaker, 21 December 1961 



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