If one takes this number of photographs, randomly, within 

 a square mile, he will photograph about 90^ of the area. 

 While two miles of cable does have some effect on the con- 

 trol which can be exercised on the "fish", our techniques 

 are certainly better than random. Also, the SCORPION Is 

 quite large, so these figures can be reduced for this 

 particular search. They must all be reduced by the same 

 factor, so the wide angle camera still requires significantly 

 less photographs. Film costs about 5 cents a foot, so the 

 film costs in all cases are insignificant compared to oper- 

 ating expenses. However, the time required to expose, process, 

 and view the film is an Important consideration. The single 

 camera is inferior in all these aspects. The photographing 

 time is the same for the three camera array and the wide 

 angle camera since they have the same search width. If 

 processing time were the only consideration, the values 

 shown could be decreased by use of high speed processors, 

 but the viewing time provides the real test. It is nec- 

 essary to view film for a few hours in order to appreciate 

 what 130 hours of viewing time really means. Viewing film 

 effectively for many hours is not difficult -- it is 

 impossible.' The I5 hours of viewing time spread over I50 

 hours of bottom time is much more practical. 



The wide angle camera shown in Figure 6 is handicapped 

 by a low film capacity. To overcome this difficulty the 

 camera shown in Figure 7 was developed. This is anEG&G 

 model 207A survey camera modified to use the NRL developed 

 wide angle lens system. The camera holds 5OO feet of film 

 and will take about 4000 photographs per lowering. Taking 

 two exposures per minute, the camera wHl photograph approximately 

 one half a square mile and a run will last over 33 hours. Dif- 

 ficulty with the hemispherical windows on this camera pre- 

 cluded its use until the latter part of the search. It was 

 used for 8 of the 80 lowerings and made nearly 25^ of the 

 photographs taken during the operation, including the first 

 photographs of SCORPION. 



For most of the search, EG&G model 208 Electronic Light 

 sources were used. These are certainly an improvement over 

 the equipment available at the time of the THRESHER search. 

 They are more efficient, produce more light, are more de- 

 pendable and are much quieter from an electrical interference 

 viewpoint . 



During the five months of the SCORPION search, the MIZAR 

 made 80 camera runs and took approximately 142,000 photographs. 

 On some of these runs, two or three cameras were used. If the 

 resulting redundancies are eliminated, approximately 119,000 

 photographs remain. The total area photographed was about I3 

 square miles. Comparing these figures with the 84,000 photo- 

 graphs of less than one square mile obtained during two years 



46 



