478 



KDtJEKTON 



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Fig. 6. A bottom-i^hotdgraphy equipment as used on the H.W Chain by the Woods Hole 

 Oceanographic Institution. Two cameras at the top prockice a stereo pair of photo- 

 graphs. A 100 w.s. strobe is at the bottom. The "pinger" is located at the center. 



Fig. 7. A photograph of n rock outcroj) on the North wall of the Puerto Rico Trench, 

 taken with the equipment shown in l^'ig. 6. 



