APPENDIX C 



Panchromatic film was used, without filters, for under 

 water work, — the film being supplied with extra long red 

 leaders and tail pieces. Although these made the film 

 supposedly day-light loading, we took no chances and 

 always used a loading bag. 



In the waters about Port-au-Prince we found that 

 beyond twenty-five feet from the camera, the haze in the 

 water was too great to pick up more than vague outlines 

 on the film. In clearer water, further distance might easily 

 be attained. 



After using this camera under water for four months, 

 certain suggestions regarding improvements can be made. 

 Two of these, of little importance, are to make the handle 

 on the top larger, so that four fingers can easily grip it, and 

 to place larger butterfly-nuts on the rear lid. With fingers 

 wet and drawn and sensitive after a few hours of diving, 

 tightening the small nuts brought about a considerable 

 amount of profanity that might easily be obviated. 



A third improvement, of greater consequence, would be 

 to place a finder on the upper surface of the case or on the 

 left hand side, that would indicate the field visible on the 

 film. After a certain amount of experience it is fairly 

 easy to operate the camera without a finder, but having 

 one would simplify matters. The making of this finder 

 is not as easy as it appears to be. This is so, first, 

 because the diving helmet does not allow the wearer's head 

 to come as close to the camera as it would in the open air, 

 and lining up two points is a more difficult task than it is 

 above water and secondly, the refraction of the water must 

 be taken into account. 



As can be seen, the apparatus is as simple as it could 

 possibly be, and the resulting photographs have proved 

 of great beauty and of real scientific worth. It is hoped 

 that this simplicity will induce more people to descend and 

 photograph and bring back records of the only other world 

 from which we who live on earth, can return. 



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