Fig. 8. Rear view of Underwater Television shows 

 tripod legs, pressure vessels, camera 

 cradle and cable attachments for under- 

 water photo-flood Icjnp. Arrow indicates 

 vertical drive linkage which operates 

 vertical scanning. 



Recording of observations at the monitor screen can be made 

 by still or motion picture cameras, Kinescoping with the movie camera 

 can be a very unique and complicated process involving expensive equip- 

 ments as done by the television broadcast studios. Service engineers 

 developed a relatively simple process using a l6mm. movie camera modi- 

 fied to operate with a synchronous motor with gear coupling to run at 

 l5 frames per second. For best photogr^hic results Service engineers 

 found that the television camera screen should be reduced in contrast. 

 The picture should have no bloom or spot, but brightness should be 

 adjusted to a grey tone rather than black. In this manner very satis- 

 factory recordings can be made from the screen of the monitor for later 

 laboratory study. 



The underwater television vehicle permits good observations 

 of model trawls, otter boards, trolled lures, shrimp and lobster traps 

 and other gears from close-ups to distances of 60 - 70 feet under 

 favorable conditions (fig. 9). In addition to preliminary midvzater 

 trawl observations with the Navy in November 195U, the vehicle is used 

 in continuing experimental fishing activities with trawling gear 

 (fig. 10). 



13 



