Figure 7.— Left side of large camera unit showing mounting plate, for power supply and 

 take-up motor, bolted to camera top. 



and to keep voltage drop to a minimum, 110- 

 volt a.c. current is used between the vessel 

 and the underwater cameras as a combina- 

 tion command signal and operating current. 

 The camera motors require 24 volts d.c. 



Conversion of the 110-volt a.c. current 

 to 24-volt d.c. is accomplished by a compact 

 converter package in each underwater housing 

 (fig. 8). The converter packages are installed 

 after being moisture-proofed by wrapping with 

 plastic electrical tape (figs. 5 and 9). 



24 V.D.C. CINE CAMERA POWER SUPPLY 



110 V. A.C. LINE 



FROM CONTROL 



BOX 



tc 



24 V.D.C. TO 

 CAMERA 



T, 110 24 VOIT, 2 AMP. TRANSFORMER 



C 200 V.D.C, 2 MFD. CAPACITOR 



F .75 AMP. SLO-BIO FUSE 



D SILICON RECTIFIER, 6 AMP., 100 PIV 



Figure 8. 24-volt d.c. cine camera supply schematic. 



Underwater Camera Housings 



The small cameras are operated in plastic 

 housings; the large, 400-foot camera is pro- 

 tected by an aluminum housing. 



The plastic housings (figs. 10 and 11) are 

 constructed from a 16- inch length of Schedule 

 120, normal impact, polyvinyl chloride (PVC) 

 pipe, with a nominal diameter of 5 inches. 

 The rear closure of the housing, containing 

 a Joy receptacle, is machined from a 1-inch 

 PVC sheet and cemented in place. 



The front of the plastic housing is sealed 

 by seating a glass port on an "0" ring. The 

 glass port is held in place with a plastic cap 

 and two aluminum straps (figs. 12 and 13). 

 The camera can be quickly removed from 

 this end for servicing. The aluminum housing 

 for the 400-foot camera (figs. 14 and 15) is 

 constructed from No. 6061-T6 pipe. Four 

 wing nuts provide ample sealing. Although 

 the housing was designed for a working depth 

 of 300 feet, it has been successfully tested 

 at a simulated depth of 600 feet. 



Underwater Power Cable 



Standard neoprene covered, 3-conductor, 

 12-gage electrical cable is ujed to transmit 

 power to the cameras. The cable is fastened 



