SECT. 2] 



UNDERWATER PHOTOGRAPHY 



477 



Fig. 4. Example to show data photo on same fihii as the iinderwater picture. Depth is 

 sho\vTi as pressure in psi. 



Fig. 5. One-half of a stereo pair of photographs taken from the R.V. Chain by the 

 Woods Hole Oceanographic Institution at a depth of about 1100 m. The data section 

 at the right shows pressure, time and other information. A compass in the field of 

 view shows direction of the bottom. 



