of obtaining close-up photographs, both single-frame and stereo, 

 of the detailed topography of the sea floor. It will also be employed 

 for photogrammetric mapping of the sea floor. 



Requirements and Specifications : 



a. To be utilized primarily for stopped ("lying-to") operations 

 but also for slow-speed operations with ship underway at 0-5 knots. 



b. To be operable in coastal and oceanic waters, at depths of 

 0-6, 500 fathoms. 



c. Film capacity: Approximately 100 to 150 feet of 70mm. filna. 



d. Photographic distance: 



(l) Single-frame photographs: should accept object distances 

 of Z-30 fee"t~ 



(Z) Stereo photographs: should accomimodate close (Z feet) 

 and long (35-50 feet) object distances. 



e. The camera instrument must include, or have attached there- 

 to, a device which measures and indicates at all times to an observer 

 on deck the precise height of the camera unit above the sea floor. 



f. A deep-water, synchronized illuminating device must be in- 

 corporated in this instrument in order to light adequately the photo- 

 graphic field. 



g. The instrument must incorporate variable, preprogrammed 

 shutter operation to provide for both continuous and timie- series 

 studies. 



h. The camera unit must be capable of taking both horizontal 

 and vertical underwater photographs. 



i. The camera and its associated devices should provide and 

 photograph the following minimum supporting information in the 

 corner of each frame: (1) date/time, (Z) location, (3) camera atti- 

 tude, and (4) camera direction. 



j. In addition, a turbidity meter shall be incorporated into the 

 system for on-deck indication of operational photographic conditions 



386 



