Figure 19. — Small camera on trawl headrope. Metal frame (fig. 2) replaces plywood panel. 



MASTER CAMERA SYSTEM CONTROL BOX 



The portable master control box (figs. 3 and 

 20) permits continuous monitoring of camera 

 operation. Elapsed running time, film run out, 

 jamming shorts, and cable breaks are in- 

 stantly detected aboard ship. 



WIRING SCHEMATIC FOR REMOTE CINE CAMERA CONTROL 



BOX 



TO 



CAMERAS 



S, DPST SWITCH 



F, 1.5 AMP. SLO-BID FUSE 



P, PHOT LAMP 



M, 0-5 AMP. AMMETER 



M, ELAPSED TIME RECORDER 



f^ure 20. — Schematic wiring diagram for remote citie 

 camera control box. 



REMOTE READOUT LIGHT METER 



Underwater photographic exposures cannot 

 always be accurately predicted. A small un- 

 derwater light meter that is operated from 

 aboard ship was designed and constructed to 

 overcome this handicap. It was not designed 

 as a precision laboratory device, but merely 

 as a relatively inexpensive tool for measuring 

 subsurface light levels with sufficient accuracy 

 for photography. Use of the meter often permits 

 extension of photographic time, particularly 

 in early morning and late afternoon hours. 



The meter design is simple (figs. 21, 22, 

 and 23). Basically the meter consists of a 

 partially shielded underwater photoresistor 

 which is focused on a neutral grey target. 

 The light cell is connected to a small control 

 box on the surface that houses the readout 

 meter and batteries. The two units are con- 

 nected by 300 feet of 2-conductor neoprene 

 covered household electric cord. The light- 

 cell end of the cable is weighted, and, in 

 operation, is thrown overboard and permitted 

 to sink to the required depth. The selector 

 switch is always set on low voltage first, 

 since operation of the light cell at values 

 over 2 ma., will cause a breakdown. 



The light meter should be calibrated while 

 it has the same camera and film combination 



11 



