during lowering and thus prevent a blurred 

 picture. The camera pressure case is mounted 

 below the vane. The case is made of aluminum 

 approximately 1 inch thick. The glass port in 

 the bottom of the case is nearly %-inch thick. 

 Next to the port are 2 spark-plug-type con- 

 nectors with plastic insulators, pressure sealed 

 with 0-rings. They are connected to male 

 banana plugs inside the case. The cover plate 

 on the top of the case is secured with about 

 eight stainless steel bolts and pressure sealed 

 with an 0-ring. On the inner side of the cover 

 plate is a spring for holding the camera in 

 position (fig. 7-2). 



The camera is mounted in a cylinder which 

 fits inside the pressure case. It has a compur- 

 type shutter and uses 616 roll film. The 

 shutter is actuated by a solenoid. There are 

 3 female banana plugs on the front which fit 



over those inside the pressure case: 1 for the 

 batteries, 1 for the photoflash bulb, and the 

 third for the ground. The lens has a fixed 

 focus set for the distance from the camera to 

 the bottom of the assembly. 



The photoflash unit is mounted approxi- 

 mately 5 feet below the camera pressure case. 

 The case contains the flashbulb and socket in 

 a removable glass housing which protects them 

 from water and pressure effects. 



The firing mechanism and battery case are 

 located below the photoflash unit. The upper 

 part of the case holds a microswitch wired 

 through the top of the case via a spark-plug-type 

 connector to the camera case. The four flash- 

 light batteries to power the system are mounted 

 below the microswitch. They are inserted 

 through the bottom of the case. A spark-plug- 

 tvpe connector in the bottom cap is grounded 



Figure 7-2. Underwater camera and pressure case. 



H, O. 607 



73 



