pressurization in a dielectric liquid medium. 

 Dielectric liquids transmit negligible shear 

 which allows exposure of fragile components. 

 Since the electrical resistance of all dielectrics 

 increases with pressure (43), the chance of 

 spontaneous arcing because of dielectric 

 breakdown is minimal, thereby providing gre- 

 ater latitude to the designer of high-voltage 

 equipment. Other advantages are realized in 

 weight-saving and visual inspection if opti- 

 cally transparent dielectric and container 

 material is used. 



Circuit Design 



No two manufacturers of submersibles fol- 

 low the same circuitry design or allocation of 

 power. Consequently, it would serve little 



purpose to present just one or two power 

 schematic diagrams, for they would be repre- 

 sentative of only themselves. In the same 

 vein, very little has been published regard- 

 ing the philosophy of circuit design, which 

 leaves the investigator in a quandary if he 

 wishes to base his design on other than 

 intuition. For such reasons, the contents of 

 this section will deal with the manner in 

 which circuit design and power distribution 

 should be approached, rather than how it 

 actually has been carried out. Two sources 

 are drawn upon for the major portion of this 

 information: 1) The DOT Handbook on Pene- 

 trators. Connectors and Harnesses (31) and 

 2) course notes taken at a short course in 

 Manned Submersibles at UCLA presented by 



TRACKING PINGER 

 AUXILIARY BALLAST TANK SENSOR 

 MAGNESYN COMPASS 

 MERCURY TRIM LEVEL SENSOR 

 RUDDER ACTUATOR BOX 

 UQC TRANSDUCER 



COMMUNICATION ANTENNA 

 HOVERING MOTOR 



PORT & STARBOARD PENETRATORS 

 FORWARD PENETRATOR 



PROPULSION MOTOR 



DEPTH TRANSDUCER 



BOWTHRUSTER MOTOR 



BOW LIGHT 



TV CAMERA 



DEPTH TRANSDUCER 



Fig. 7.36 Outboard electrical components. 



356 



