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 Figure 1. — General schematic diagram for underwater camera system. 



Figure 2. — Midwater trawl schematic diagram show 



wherever its water resistance will not be a 

 problem. Smaller 50- and 100-foot capacity 

 cameras, although they permit only 1 or 2 

 minutes running time at 32 f.p.s., are used 

 where size is a limiting factor. 



Two standard types of interchangeable GSAP 

 film magazines are used in this system; a 

 50-foot I^B-4A and a 100-foot 6230-B. The 

 400-foot film capacity is obtained by modify- 

 ing an LB-4A magazine for attachment of a 

 Bell 8t Howell 132 BM 400-foot external film 

 magazine (figs. 4 and 5). 



The LB-4A and 6230-B magazines are 

 equipped with single-toothed sprockets as 

 standard equipment. These do not maintain 

 sufficient grip on the sprocket holes. Their 

 replacement with double-toothed sprockets 

 (available as accessories) is necessary. 



ing location of cameras on headrope and in throat. 



The LB-4A and 132 BM magazines (for 400- 

 foot capacity) are coupled by attaching a 132- 

 BM mounting plate to the top of an L.B-4A mag- 

 azine (fig. 6), after matching holes are 

 machined at the rear or the top of the LB-4A 

 magazine. The film supply and takeup shafts in 

 the LB-4A are removed next since their func- 

 tions are accomplished by the 132-BM magazine 

 and the shafts would interfere with the new 

 film path. 



The existing film supply roller is moved 

 under the front opening (film inlet) to prevent 

 film scraping. An auxiliary takeup film roller 

 is installed under the rear opening (film exit) 

 for the same purpose. Holes remaining in 

 the L,B-4A magazine, after modification, are 

 plugged to prevent light leaks. A conversion 

 kit is available commercially. 



