presence of sea water in sufficient quantity to short out the electrodes 

 caused a circuit to be completed turning on a red warning light in the 

 control panel on board ship. A lamp test switch was installed on the 

 control panel to insure that lamp filaments were intact. 



TELEVISION EQUIPMENT 



The heart of the vehicle was the Vidicon industrial television 

 equipment. The system employed was the one at hand, an RCA-ITV^, and 

 its chief advantage was the relatively snail size of the camera. The 

 closed circuit system employed operated in a standard scanning frequency 

 of 525 lines - 30 frames interlaced. Basically the unit consisted of 

 a portable monitor control unit mounting a ten inch viewing screen, a 

 relatively small canera about the size of a l6ram. movie camera, and SO 

 to 500 feet of multi-conductor cable (fig. 6). 



Fig. 6. Underwater -Television chain. Left to 



right- camera pressure vessel, T-V camera, 

 mult i- conductor cable and control monitor. 



The camera unit contained a 1" 6198 Vidicon photo-conductive 

 pick-up tube, video amplification stage, a blanking amplifier, optical 

 focus, and iris control motors. The relatively compact control unit 

 was a combination povrer supply, operator's control panel, and monitor 

 smaller than the average home receiver. The monitor, housed all controls 

 for brightness, contrast, target, beam intensity, electronic focus, and 

 optical focus. A radio frequency generator was provided to supply a 



10 



